Vulnerability-Lookup

OESA-2023-1762 (CVE-2023-38545)

Vulnerability from osv_openeuler – Published: 2023-10-23 11:06 – Updated: 2026-08-06 11:06 – Source website

Summary

curl security update

Details

cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols.

Security Fix(es):

This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy handshake.

When curl is asked to pass along the host name to the SOCKS5 proxy to allow that to resolve the address instead of it getting done by curl itself, the maximum length that host name can be is 255 bytes.

If the host name is detected to be longer, curl switches to local name resolving and instead passes on the resolved address only. Due to this bug, the local variable that means "let the host resolve the name" could get the wrong value during a slow SOCKS5 handshake, and contrary to the intention, copy the too long host name to the target buffer instead of copying just the resolved address there.

The target buffer being a heap based buffer, and the host name coming from the URL that curl has been told to operate with. (CVE-2023-38545)

This flaw allows an attacker to insert cookies at will into a running program using libcurl, if the specific series of conditions are met.

libcurl performs transfers. In its API, an application creates "easy handles" that are the individual handles for single transfers.

libcurl provides a function call that duplicates en easy handle called curl_easy_duphandle.

If a transfer has cookies enabled when the handle is duplicated, the cookie-enable state is also cloned - but without cloning the actual cookies. If the source handle did not read any cookies from a specific file on disk, the cloned version of the handle would instead store the file name as none (using the four ASCII letters, no quotes).

Subsequent use of the cloned handle that does not explicitly set a source to load cookies from would then inadvertently load cookies from a file named none - if such a file exists and is readable in the current directory of the program using libcurl. And if using the correct file format of course. (CVE-2023-38546)

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References

URL

Type

	https://www.openeuler.org/en/security/safety-bull…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2023-38545	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2023-38546	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "curl-debuginfo-7.71.1-31.oe1.aarch64.rpm",
          "libcurl-7.71.1-31.oe1.aarch64.rpm",
          "libcurl-devel-7.71.1-31.oe1.aarch64.rpm",
          "curl-7.71.1-31.oe1.aarch64.rpm",
          "curl-debugsource-7.71.1-31.oe1.aarch64.rpm"
        ],
        "noarch": [
          "curl-help-7.71.1-31.oe1.noarch.rpm"
        ],
        "src": [
          "curl-7.71.1-31.oe1.src.rpm"
        ],
        "x86_64": [
          "curl-7.71.1-31.oe1.x86_64.rpm",
          "libcurl-7.71.1-31.oe1.x86_64.rpm",
          "curl-debugsource-7.71.1-31.oe1.x86_64.rpm",
          "libcurl-devel-7.71.1-31.oe1.x86_64.rpm",
          "curl-debuginfo-7.71.1-31.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "curl",
        "purl": "pkg:rpm/openEuler/curl\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.71.1-31.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "curl-7.71.1-31.oe1.aarch64.rpm",
          "libcurl-7.71.1-31.oe1.aarch64.rpm",
          "libcurl-devel-7.71.1-31.oe1.aarch64.rpm",
          "curl-debuginfo-7.71.1-31.oe1.aarch64.rpm",
          "curl-debugsource-7.71.1-31.oe1.aarch64.rpm"
        ],
        "noarch": [
          "curl-help-7.71.1-31.oe1.noarch.rpm"
        ],
        "src": [
          "curl-7.71.1-31.oe1.src.rpm"
        ],
        "x86_64": [
          "curl-debuginfo-7.71.1-31.oe1.x86_64.rpm",
          "curl-debugsource-7.71.1-31.oe1.x86_64.rpm",
          "curl-7.71.1-31.oe1.x86_64.rpm",
          "libcurl-7.71.1-31.oe1.x86_64.rpm",
          "libcurl-devel-7.71.1-31.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP3",
        "name": "curl",
        "purl": "pkg:rpm/openEuler/curl\u0026distro=openEuler-20.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.71.1-31.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "curl-7.79.1-24.oe2203.aarch64.rpm",
          "curl-debuginfo-7.79.1-24.oe2203.aarch64.rpm",
          "libcurl-devel-7.79.1-24.oe2203.aarch64.rpm",
          "libcurl-7.79.1-24.oe2203.aarch64.rpm",
          "curl-debugsource-7.79.1-24.oe2203.aarch64.rpm",
          "curl-debuginfo-7.79.1-24.oe2203sp1.aarch64.rpm",
          "libcurl-devel-7.79.1-24.oe2203sp1.aarch64.rpm",
          "libcurl-7.79.1-24.oe2203sp1.aarch64.rpm",
          "curl-debugsource-7.79.1-24.oe2203sp1.aarch64.rpm",
          "curl-7.79.1-24.oe2203sp1.aarch64.rpm",
          "curl-debuginfo-7.79.1-24.oe2203sp2.aarch64.rpm",
          "curl-7.79.1-24.oe2203sp2.aarch64.rpm",
          "libcurl-7.79.1-24.oe2203sp2.aarch64.rpm",
          "curl-debugsource-7.79.1-24.oe2203sp2.aarch64.rpm",
          "libcurl-devel-7.79.1-24.oe2203sp2.aarch64.rpm"
        ],
        "noarch": [
          "curl-help-7.79.1-24.oe2203.noarch.rpm",
          "curl-help-7.79.1-24.oe2203sp1.noarch.rpm",
          "curl-help-7.79.1-24.oe2203sp2.noarch.rpm"
        ],
        "src": [
          "curl-7.79.1-24.oe2203.src.rpm",
          "curl-7.79.1-24.oe2203sp1.src.rpm",
          "curl-7.79.1-24.oe2203sp2.src.rpm"
        ],
        "x86_64": [
          "curl-debuginfo-7.79.1-24.oe2203.x86_64.rpm",
          "libcurl-devel-7.79.1-24.oe2203.x86_64.rpm",
          "curl-debugsource-7.79.1-24.oe2203.x86_64.rpm",
          "curl-7.79.1-24.oe2203.x86_64.rpm",
          "libcurl-7.79.1-24.oe2203.x86_64.rpm",
          "libcurl-devel-7.79.1-24.oe2203sp1.x86_64.rpm",
          "curl-7.79.1-24.oe2203sp1.x86_64.rpm",
          "libcurl-7.79.1-24.oe2203sp1.x86_64.rpm",
          "curl-debuginfo-7.79.1-24.oe2203sp1.x86_64.rpm",
          "curl-debugsource-7.79.1-24.oe2203sp1.x86_64.rpm",
          "curl-7.79.1-24.oe2203sp2.x86_64.rpm",
          "libcurl-devel-7.79.1-24.oe2203sp2.x86_64.rpm",
          "libcurl-7.79.1-24.oe2203sp2.x86_64.rpm",
          "curl-debugsource-7.79.1-24.oe2203sp2.x86_64.rpm",
          "curl-debuginfo-7.79.1-24.oe2203sp2.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS",
        "name": "curl",
        "purl": "pkg:rpm/openEuler/curl\u0026distro=openEuler-22.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.79.1-24.oe2203sp2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "curl-debuginfo-7.79.1-24.oe2203sp1.aarch64.rpm",
          "libcurl-devel-7.79.1-24.oe2203sp1.aarch64.rpm",
          "libcurl-7.79.1-24.oe2203sp1.aarch64.rpm",
          "curl-debugsource-7.79.1-24.oe2203sp1.aarch64.rpm",
          "curl-7.79.1-24.oe2203sp1.aarch64.rpm"
        ],
        "noarch": [
          "curl-help-7.79.1-24.oe2203sp1.noarch.rpm"
        ],
        "src": [
          "curl-7.79.1-24.oe2203sp1.src.rpm"
        ],
        "x86_64": [
          "libcurl-devel-7.79.1-24.oe2203sp1.x86_64.rpm",
          "curl-7.79.1-24.oe2203sp1.x86_64.rpm",
          "libcurl-7.79.1-24.oe2203sp1.x86_64.rpm",
          "curl-debuginfo-7.79.1-24.oe2203sp1.x86_64.rpm",
          "curl-debugsource-7.79.1-24.oe2203sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP1",
        "name": "curl",
        "purl": "pkg:rpm/openEuler/curl\u0026distro=openEuler-22.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.79.1-24.oe2203sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "curl-debuginfo-7.79.1-24.oe2203sp2.aarch64.rpm",
          "curl-7.79.1-24.oe2203sp2.aarch64.rpm",
          "libcurl-7.79.1-24.oe2203sp2.aarch64.rpm",
          "curl-debugsource-7.79.1-24.oe2203sp2.aarch64.rpm",
          "libcurl-devel-7.79.1-24.oe2203sp2.aarch64.rpm"
        ],
        "noarch": [
          "curl-help-7.79.1-24.oe2203sp2.noarch.rpm"
        ],
        "src": [
          "curl-7.79.1-24.oe2203sp2.src.rpm"
        ],
        "x86_64": [
          "curl-7.79.1-24.oe2203sp2.x86_64.rpm",
          "libcurl-devel-7.79.1-24.oe2203sp2.x86_64.rpm",
          "libcurl-7.79.1-24.oe2203sp2.x86_64.rpm",
          "curl-debugsource-7.79.1-24.oe2203sp2.x86_64.rpm",
          "curl-debuginfo-7.79.1-24.oe2203sp2.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP2",
        "name": "curl",
        "purl": "pkg:rpm/openEuler/curl\u0026distro=openEuler-22.03-LTS-SP2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.79.1-24.oe2203sp2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols.\r\n\r\nSecurity Fix(es):\r\n\r\nThis flaw makes curl overflow a heap based buffer in the SOCKS5 proxy\nhandshake.\r\n\r\nWhen curl is asked to pass along the host name to the SOCKS5 proxy to allow\nthat to resolve the address instead of it getting done by curl itself, the\nmaximum length that host name can be is 255 bytes.\r\n\r\nIf the host name is detected to be longer, curl switches to local name\nresolving and instead passes on the resolved address only. Due to this bug,\nthe local variable that means \u0026quot;let the host resolve the name\u0026quot; could get the\nwrong value during a slow SOCKS5 handshake, and contrary to the intention,\ncopy the too long host name to the target buffer instead of copying just the\nresolved address there.\r\n\r\nThe target buffer being a heap based buffer, and the host name coming from the\nURL that curl has been told to operate with.\n(CVE-2023-38545)\r\n\r\nThis flaw allows an attacker to insert cookies at will into a running program\nusing libcurl, if the specific series of conditions are met.\r\n\r\nlibcurl performs transfers. In its API, an application creates \u0026quot;easy handles\u0026quot;\nthat are the individual handles for single transfers.\r\n\r\nlibcurl provides a function call that duplicates en easy handle called\n[curl_easy_duphandle](https://curl.se/libcurl/c/curl_easy_duphandle.html).\r\n\r\nIf a transfer has cookies enabled when the handle is duplicated, the\ncookie-enable state is also cloned - but without cloning the actual\ncookies. If the source handle did not read any cookies from a specific file on\ndisk, the cloned version of the handle would instead store the file name as\n`none` (using the four ASCII letters, no quotes).\r\n\r\nSubsequent use of the cloned handle that does not explicitly set a source to\nload cookies from would then inadvertently load cookies from a file named\n`none` - if such a file exists and is readable in the current directory of the\nprogram using libcurl. And if using the correct file format of course.\n(CVE-2023-38546)",
  "id": "OESA-2023-1762",
  "modified": "2026-08-06T11:06:12Z",
  "published": "2023-10-23T11:06:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1762"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-38545"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-38546"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "curl security update",
  "upstream": [
    "CVE-2023-38545",
    "CVE-2023-38546"
  ]
}

CVE-2023-38545 (GCVE-0-2023-38545)

Vulnerability from cvelistv5 – Published: 2023-10-18 03:52 – Updated: 2026-07-14 12:03

Summary

This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy handshake. When curl is asked to pass along the host name to the SOCKS5 proxy to allow that to resolve the address instead of it getting done by curl itself, the maximum length that host name can be is 255 bytes. If the host name is detected to be longer, curl switches to local name resolving and instead passes on the resolved address only. Due to this bug, the local variable that means "let the host resolve the name" could get the wrong value during a slow SOCKS5 handshake, and contrary to the intention, copy the too long host name to the target buffer instead of copying just the resolved address there. The target buffer being a heap based buffer, and the host name coming from the URL that curl has been told to operate with.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-10-17 21:11 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

hackerone mitre root

References

21 references

URL	Tags
https://curl.se/docs/CVE-2023-38545.html
https://security.netapp.com/advisory/ntap-2023102…
https://lists.fedoraproject.org/archives/list/pac…
https://www.secpod.com/blog/high-severity-heap-bu…
https://support.apple.com/kb/HT214036
https://support.apple.com/kb/HT214063
https://support.apple.com/kb/HT214057
https://support.apple.com/kb/HT214058
http://seclists.org/fulldisclosure/2024/Jan/34
http://seclists.org/fulldisclosure/2024/Jan/37
http://seclists.org/fulldisclosure/2024/Jan/38
https://security.netapp.com/advisory/ntap-2024020…
https://forum.vmssoftware.com/viewtopic.php?f=8&t=8868
https://github.com/bcdannyboy/CVE-2023-38545	exploit
https://github.com/dbrugman/CVE-2023-38545-POC	exploit
https://github.com/UTsweetyfish/CVE-2023-38545	exploit
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

5 products

Vendor	Product	Version
curl	curl	Affected: 8.4.0 , < 8.4.0 (semver) Unaffected: 7.69.0 , < 7.69.0 (semver)
Siemens	RUGGEDCOM APE1808	Affected: 0 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T17:46:56.235Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://curl.se/docs/CVE-2023-38545.html"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20231027-0009/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OGMXNRNSJ4ETDK6FRNU3J7SABXPWCHSQ/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.secpod.com/blog/high-severity-heap-buffer-overflow-vulnerability/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT214036"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT214063"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT214057"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT214058"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2024/Jan/34"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2024/Jan/37"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2024/Jan/38"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20240201-0005/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://forum.vmssoftware.com/viewtopic.php?f=8\u0026t=8868"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 8.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2023-38545",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-17T21:11:03.346985Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-787",
                "description": "CWE-787 Out-of-bounds Write",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-08-27T20:32:53.710Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/bcdannyboy/CVE-2023-38545"
          },
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/dbrugman/CVE-2023-38545-POC"
          },
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/UTsweetyfish/CVE-2023-38545"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      },
      {
        "affected": [
          {
            "defaultStatus": "unknown",
            "product": "RUGGEDCOM APE1808",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-14T12:03:14.064Z",
          "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
          "shortName": "siemens-SADP"
        },
        "references": [
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-943925.html"
          },
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-832273.html"
          },
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-093430.html"
          },
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
          },
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-507364.html"
          }
        ],
        "x_adpType": "supplier"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "curl",
          "vendor": "curl",
          "versions": [
            {
              "lessThan": "8.4.0",
              "status": "affected",
              "version": "8.4.0",
              "versionType": "semver"
            },
            {
              "lessThan": "7.69.0",
              "status": "unaffected",
              "version": "7.69.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy\nhandshake.\n\nWhen curl is asked to pass along the host name to the SOCKS5 proxy to allow\nthat to resolve the address instead of it getting done by curl itself, the\nmaximum length that host name can be is 255 bytes.\n\nIf the host name is detected to be longer, curl switches to local name\nresolving and instead passes on the resolved address only. Due to this bug,\nthe local variable that means \"let the host resolve the name\" could get the\nwrong value during a slow SOCKS5 handshake, and contrary to the intention,\ncopy the too long host name to the target buffer instead of copying just the\nresolved address there.\n\nThe target buffer being a heap based buffer, and the host name coming from the\nURL that curl has been told to operate with."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-07-09T13:27:08.128Z",
        "orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
        "shortName": "hackerone"
      },
      "references": [
        {
          "url": "https://curl.se/docs/CVE-2023-38545.html"
        },
        {
          "url": "https://security.netapp.com/advisory/ntap-20231027-0009/"
        },
        {
          "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OGMXNRNSJ4ETDK6FRNU3J7SABXPWCHSQ/"
        },
        {
          "url": "https://www.secpod.com/blog/high-severity-heap-buffer-overflow-vulnerability/"
        },
        {
          "url": "https://support.apple.com/kb/HT214036"
        },
        {
          "url": "https://support.apple.com/kb/HT214063"
        },
        {
          "url": "https://support.apple.com/kb/HT214057"
        },
        {
          "url": "https://support.apple.com/kb/HT214058"
        },
        {
          "url": "http://seclists.org/fulldisclosure/2024/Jan/34"
        },
        {
          "url": "http://seclists.org/fulldisclosure/2024/Jan/37"
        },
        {
          "url": "http://seclists.org/fulldisclosure/2024/Jan/38"
        },
        {
          "url": "https://security.netapp.com/advisory/ntap-20240201-0005/"
        },
        {
          "url": "https://forum.vmssoftware.com/viewtopic.php?f=8\u0026t=8868"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
    "assignerShortName": "hackerone",
    "cveId": "CVE-2023-38545",
    "datePublished": "2023-10-18T03:52:00.816Z",
    "dateReserved": "2023-07-20T01:00:12.444Z",
    "dateUpdated": "2026-07-14T12:03:14.064Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2023-38546 (GCVE-0-2023-38546)

Vulnerability from cvelistv5 – Published: 2023-10-18 03:51 – Updated: 2026-07-14 12:03

Summary

This flaw allows an attacker to insert cookies at will into a running program using libcurl, if the specific series of conditions are met. libcurl performs transfers. In its API, an application creates "easy handles" that are the individual handles for single transfers. libcurl provides a function call that duplicates en easy handle called [curl_easy_duphandle](https://curl.se/libcurl/c/curl_easy_duphandle.html). If a transfer has cookies enabled when the handle is duplicated, the cookie-enable state is also cloned - but without cloning the actual cookies. If the source handle did not read any cookies from a specific file on disk, the cloned version of the handle would instead store the file name as `none` (using the four ASCII letters, no quotes). Subsequent use of the cloned handle that does not explicitly set a source to load cookies from would then inadvertently load cookies from a file named `none` - if such a file exists and is readable in the current directory of the program using libcurl. And if using the correct file format of course.

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-13 15:01 UTC

Assigner

hackerone mitre root

References

15 references

URL	Tags
https://curl.se/docs/CVE-2023-38546.html
https://lists.fedoraproject.org/archives/list/pac…
https://support.apple.com/kb/HT214036
https://support.apple.com/kb/HT214063
https://support.apple.com/kb/HT214057
https://support.apple.com/kb/HT214058
http://seclists.org/fulldisclosure/2024/Jan/34
http://seclists.org/fulldisclosure/2024/Jan/37
http://seclists.org/fulldisclosure/2024/Jan/38
https://forum.vmssoftware.com/viewtopic.php?f=8&t=8868
https://lists.debian.org/debian-lts-announce/2023…
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

5 products

Vendor	Product	Version
curl	curl	Affected: 8.4.0 , < 8.4.0 (semver) Unaffected: 7.9.1 , < 7.9.1 (semver)
Siemens	RUGGEDCOM APE1808	Affected: 0 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T19:17:18.131Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://curl.se/docs/CVE-2023-38546.html"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OGMXNRNSJ4ETDK6FRNU3J7SABXPWCHSQ/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT214036"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT214063"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT214057"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT214058"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2024/Jan/34"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2024/Jan/37"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2024/Jan/38"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://forum.vmssoftware.com/viewtopic.php?f=8\u0026t=8868"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2023/10/msg00016.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2023-38546",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-13T15:01:53.358515Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-13T15:02:37.137Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "affected": [
          {
            "defaultStatus": "unknown",
            "product": "RUGGEDCOM APE1808",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          },
          {
            "defaultStatus": "unknown",
            "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "*",
                "status": "affected",
                "version": "V3.1.5",
                "versionType": "custom"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-14T12:03:15.825Z",
          "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
          "shortName": "siemens-SADP"
        },
        "references": [
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-943925.html"
          },
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-832273.html"
          },
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-093430.html"
          },
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
          }
        ],
        "x_adpType": "supplier"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "curl",
          "vendor": "curl",
          "versions": [
            {
              "lessThan": "8.4.0",
              "status": "affected",
              "version": "8.4.0",
              "versionType": "semver"
            },
            {
              "lessThan": "7.9.1",
              "status": "unaffected",
              "version": "7.9.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "This flaw allows an attacker to insert cookies at will into a running program\nusing libcurl, if the specific series of conditions are met.\n\nlibcurl performs transfers. In its API, an application creates \"easy handles\"\nthat are the individual handles for single transfers.\n\nlibcurl provides a function call that duplicates en easy handle called\n[curl_easy_duphandle](https://curl.se/libcurl/c/curl_easy_duphandle.html).\n\nIf a transfer has cookies enabled when the handle is duplicated, the\ncookie-enable state is also cloned - but without cloning the actual\ncookies. If the source handle did not read any cookies from a specific file on\ndisk, the cloned version of the handle would instead store the file name as\n`none` (using the four ASCII letters, no quotes).\n\nSubsequent use of the cloned handle that does not explicitly set a source to\nload cookies from would then inadvertently load cookies from a file named\n`none` - if such a file exists and is readable in the current directory of the\nprogram using libcurl. And if using the correct file format of course."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-07-09T13:27:34.245Z",
        "orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
        "shortName": "hackerone"
      },
      "references": [
        {
          "url": "https://curl.se/docs/CVE-2023-38546.html"
        },
        {
          "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OGMXNRNSJ4ETDK6FRNU3J7SABXPWCHSQ/"
        },
        {
          "url": "https://support.apple.com/kb/HT214036"
        },
        {
          "url": "https://support.apple.com/kb/HT214063"
        },
        {
          "url": "https://support.apple.com/kb/HT214057"
        },
        {
          "url": "https://support.apple.com/kb/HT214058"
        },
        {
          "url": "http://seclists.org/fulldisclosure/2024/Jan/34"
        },
        {
          "url": "http://seclists.org/fulldisclosure/2024/Jan/37"
        },
        {
          "url": "http://seclists.org/fulldisclosure/2024/Jan/38"
        },
        {
          "url": "https://forum.vmssoftware.com/viewtopic.php?f=8\u0026t=8868"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
    "assignerShortName": "hackerone",
    "cveId": "CVE-2023-38546",
    "datePublished": "2023-10-18T03:51:31.276Z",
    "dateReserved": "2023-07-20T01:00:12.444Z",
    "dateUpdated": "2026-07-14T12:03:15.825Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OESA-2023-1762 (CVE-2023-38545)

CVE-2023-38545 (GCVE-0-2023-38545)

CVE-2023-38546 (GCVE-0-2023-38546)

Tags

Sightings

Nomenclature

Related by attack behaviour