Vulnerability-Lookup

ubuntu-cve-2021-3156

Vulnerability from osv_ubuntu

Published

2021-01-26 18:00

Modified

2025-09-08 16:46

Summary

Details

Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash character.

Severity

7.8 (High)


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

7.8 (High)


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

N/A (UNKNOWN)


                    
                      high

References

URL

Type

	https://ubuntu.com/security/CVE-2021-3156	REPORT
	https://ubuntu.com/security/notices/USN-4705-1	ADVISORY
	https://ubuntu.com/security/notices/USN-4705-2	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2021-3156	REPORT
	https://www.cisa.gov/known-exploited-vulnerabilit…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "sudo",
            "binary_version": "1.8.9p5-1ubuntu1.5+esm6"
          },
          {
            "binary_name": "sudo-ldap",
            "binary_version": "1.8.9p5-1ubuntu1.5+esm6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "sudo",
        "purl": "pkg:deb/ubuntu/sudo@1.8.9p5-1ubuntu1.5+esm6?arch=source\u0026distro=trusty/esm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.9p5-1ubuntu1.5+esm6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.6p3-0ubuntu3",
        "1.8.8-2ubuntu1",
        "1.8.8-2ubuntu2",
        "1.8.9p4-1ubuntu1",
        "1.8.9p4-1ubuntu2",
        "1.8.9p5-1ubuntu1",
        "1.8.9p5-1ubuntu1.1",
        "1.8.9p5-1ubuntu1.2",
        "1.8.9p5-1ubuntu1.3",
        "1.8.9p5-1ubuntu1.4",
        "1.8.9p5-1ubuntu1.5+esm1",
        "1.8.9p5-1ubuntu1.5+esm2",
        "1.8.9p5-1ubuntu1.5+esm3",
        "1.8.9p5-1ubuntu1.5+esm5"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "sudo",
            "binary_version": "1.8.16-0ubuntu1.10"
          },
          {
            "binary_name": "sudo-ldap",
            "binary_version": "1.8.16-0ubuntu1.10"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "sudo",
        "purl": "pkg:deb/ubuntu/sudo@1.8.16-0ubuntu1.10?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.16-0ubuntu1.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.12-1ubuntu3",
        "1.8.16-0ubuntu1",
        "1.8.16-0ubuntu1.1",
        "1.8.16-0ubuntu1.2",
        "1.8.16-0ubuntu1.3",
        "1.8.16-0ubuntu1.4",
        "1.8.16-0ubuntu1.5",
        "1.8.16-0ubuntu1.6",
        "1.8.16-0ubuntu1.7",
        "1.8.16-0ubuntu1.8",
        "1.8.16-0ubuntu1.9"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "sudo",
            "binary_version": "1.8.21p2-3ubuntu1.4"
          },
          {
            "binary_name": "sudo-ldap",
            "binary_version": "1.8.21p2-3ubuntu1.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "sudo",
        "purl": "pkg:deb/ubuntu/sudo@1.8.21p2-3ubuntu1.4?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.21p2-3ubuntu1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.20p2-1ubuntu1",
        "1.8.21p2-2ubuntu1",
        "1.8.21p2-3ubuntu1",
        "1.8.21p2-3ubuntu1.1",
        "1.8.21p2-3ubuntu1.2",
        "1.8.21p2-3ubuntu1.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "sudo",
            "binary_version": "1.8.31-1ubuntu1.2"
          },
          {
            "binary_name": "sudo-ldap",
            "binary_version": "1.8.31-1ubuntu1.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "sudo",
        "purl": "pkg:deb/ubuntu/sudo@1.8.31-1ubuntu1.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.31-1ubuntu1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.27-1ubuntu4",
        "1.8.29-1ubuntu1",
        "1.8.31-1ubuntu1",
        "1.8.31-1ubuntu1.1"
      ]
    }
  ],
  "aliases": [],
  "details": "Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via \"sudoedit -s\" and a command-line argument that ends with a single backslash character.",
  "id": "UBUNTU-CVE-2021-3156",
  "modified": "2025-09-08T16:46:42Z",
  "published": "2021-01-26T18:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3156"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4705-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4705-2"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-3156"
    },
    {
      "type": "REPORT",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
    }
  ],
  "related": [
    "USN-4705-1",
    "USN-4705-2"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "high",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-3156"
  ]
}

CVE-2021-3156 (GCVE-0-2021-3156)

Vulnerability from cvelistv5 – Published: 2021-01-26 00:00 – Updated: 2025-10-21 23:35

Summary

Severity

7.8 (High)


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

SSVC

Exploitation: active Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

n/a
CWE-193 - Off-by-one Error

Assigner

mitre

References

35 references

URL	Tags
https://lists.debian.org/debian-lts-announce/2021…	mailing-list
http://seclists.org/fulldisclosure/2021/Jan/79	mailing-list
http://www.openwall.com/lists/oss-security/2021/01/26/3	mailing-list
https://security.gentoo.org/glsa/202101-33	vendor-advisory
https://www.debian.org/security/2021/dsa-4839	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
http://www.openwall.com/lists/oss-security/2021/01/27/1	mailing-list
http://www.openwall.com/lists/oss-security/2021/01/27/2	mailing-list
https://tools.cisco.com/security/center/content/C…	vendor-advisory
https://www.kb.cert.org/vuls/id/794544	third-party-advisory
http://seclists.org/fulldisclosure/2021/Feb/42	mailing-list
http://www.openwall.com/lists/oss-security/2021/02/15/1	mailing-list
https://www.oracle.com//security-alerts/cpujul2021.html
https://www.sudo.ws/stable.html#1.9.5p2
https://www.openwall.com/lists/oss-security/2021/…
http://packetstormsecurity.com/files/161160/Sudo-…
https://security.netapp.com/advisory/ntap-2021012…
https://security.netapp.com/advisory/ntap-2021012…
http://packetstormsecurity.com/files/161230/Sudo-…
http://packetstormsecurity.com/files/161270/Sudo-…
http://packetstormsecurity.com/files/161293/Sudo-…
https://support.apple.com/kb/HT212177
https://kc.mcafee.com/corporate/index?page=conten…
https://www.beyondtrust.com/blog/entry/security-a…
https://www.synology.com/security/advisory/Synolo…
http://www.openwall.com/lists/oss-security/2021/09/14/2	mailing-list
https://www.oracle.com/security-alerts/cpuoct2021.html
https://www.oracle.com/security-alerts/cpuapr2022.html
http://www.openwall.com/lists/oss-security/2024/01/30/8	mailing-list
http://www.openwall.com/lists/oss-security/2024/01/30/6	mailing-list
http://packetstormsecurity.com/files/176932/glibc…
http://seclists.org/fulldisclosure/2024/Feb/3	mailing-list
https://www.vicarius.io/vsociety/posts/sudoedit-p…
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Show details on NVD website

JSON

To clipboard

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              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
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              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
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                  },
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                  },
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-03T15:43:52.658146Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          },
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            "other": {
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            "time": "2022-04-06T00:00:00.000Z",
            "value": "CVE-2021-3156 added to CISA KEV"
          }
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        "title": "CISA ADP Vulnrichment"
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    "cna": {
      "affected": [
        {
          "product": "n/a",
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          "versions": [
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            "mailing-list"
          ],
          "url": "http://seclists.org/fulldisclosure/2021/Jan/79"
        },
        {
          "name": "[oss-security] 20210126 Baron Samedit: Heap-based buffer overflow in Sudo (CVE-2021-3156)",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/01/26/3"
        },
        {
          "name": "GLSA-202101-33",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.gentoo.org/glsa/202101-33"
        },
        {
          "name": "DSA-4839",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.debian.org/security/2021/dsa-4839"
        },
        {
          "name": "FEDORA-2021-2cb63d912a",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LHXK6ICO5AYLGFK2TAX5MZKUXTUKWOJY/"
        },
        {
          "name": "FEDORA-2021-8840cbdccd",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CALA5FTXIQBRRYUA2ZQNJXB6OQMAXEII/"
        },
        {
          "name": "[oss-security] 20210127 Re: Baron Samedit: Heap-based buffer overflow in Sudo (CVE-2021-3156)",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/01/27/1"
        },
        {
          "name": "[oss-security] 20210127 Re: Baron Samedit: Heap-based buffer overflow in Sudo (CVE-2021-3156)",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/01/27/2"
        },
        {
          "name": "20210129 Sudo Privilege Escalation Vulnerability Affecting Cisco Products: January 2021",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sudo-privesc-jan2021-qnYQfcM"
        },
        {
          "name": "VU#794544",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.kb.cert.org/vuls/id/794544"
        },
        {
          "name": "20210211 APPLE-SA-2021-02-09-1 macOS Big Sur 11.2.1, macOS Catalina 10.15.7 Supplemental Update, and macOS Mojave 10.14.6 Security Update 2021-002",
          "tags": [
            "mailing-list"
          ],
          "url": "http://seclists.org/fulldisclosure/2021/Feb/42"
        },
        {
          "name": "[oss-security] 20210215 Re: sudo: Ineffective NO_ROOT_MAILER and Baron Samedit",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/02/15/1"
        },
        {
          "url": "https://www.oracle.com//security-alerts/cpujul2021.html"
        },
        {
          "url": "https://www.sudo.ws/stable.html#1.9.5p2"
        },
        {
          "url": "https://www.openwall.com/lists/oss-security/2021/01/26/3"
        },
        {
          "url": "http://packetstormsecurity.com/files/161160/Sudo-Heap-Based-Buffer-Overflow.html"
        },
        {
          "url": "https://security.netapp.com/advisory/ntap-20210128-0002/"
        },
        {
          "url": "https://security.netapp.com/advisory/ntap-20210128-0001/"
        },
        {
          "url": "http://packetstormsecurity.com/files/161230/Sudo-Buffer-Overflow-Privilege-Escalation.html"
        },
        {
          "url": "http://packetstormsecurity.com/files/161270/Sudo-1.9.5p1-Buffer-Overflow-Privilege-Escalation.html"
        },
        {
          "url": "http://packetstormsecurity.com/files/161293/Sudo-1.8.31p2-1.9.5p1-Buffer-Overflow.html"
        },
        {
          "url": "https://support.apple.com/kb/HT212177"
        },
        {
          "url": "https://kc.mcafee.com/corporate/index?page=content\u0026id=SB10348"
        },
        {
          "url": "https://www.beyondtrust.com/blog/entry/security-advisory-privilege-management-for-unix-linux-pmul-basic-and-privilege-management-for-mac-pmm-affected-by-sudo-vulnerability"
        },
        {
          "url": "https://www.synology.com/security/advisory/Synology_SA_21_02"
        },
        {
          "name": "[oss-security] 20210914 Re: Oracle Solaris membership in the distros list",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/09/14/2"
        },
        {
          "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
        },
        {
          "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
        },
        {
          "name": "[oss-security] 20240130 Re: CVE-2023-6246: Heap-based buffer overflow in the glibc\u0027s syslog()",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2024/01/30/8"
        },
        {
          "name": "[oss-security] 20240130 CVE-2023-6246: Heap-based buffer overflow in the glibc\u0027s syslog()",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2024/01/30/6"
        },
        {
          "url": "http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html"
        },
        {
          "name": "20240204 CVE-2023-6246: Heap-based buffer overflow in the glibc\u0027s syslog()",
          "tags": [
            "mailing-list"
          ],
          "url": "http://seclists.org/fulldisclosure/2024/Feb/3"
        },
        {
          "url": "https://www.vicarius.io/vsociety/posts/sudoedit-pwned-cve-2021-3156"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2021-3156",
    "datePublished": "2021-01-26T00:00:00.000Z",
    "dateReserved": "2021-01-15T00:00:00.000Z",
    "dateUpdated": "2025-10-21T23:35:29.600Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

usn-4705-1

Vulnerability from osv_ubuntu

Published

2021-01-26 18:48

Modified

2026-04-27 14:11

Summary

sudo vulnerabilities

Details

It was discovered that Sudo incorrectly handled memory when parsing command lines. A local attacker could possibly use this issue to obtain unintended access to the administrator account. (CVE-2021-3156)

It was discovered that the Sudo sudoedit utility incorrectly handled checking directory permissions. A local attacker could possibly use this issue to bypass file permissions and determine if a directory exists or not. (CVE-2021-23239)

References

URL

Type

	https://ubuntu.com/security/notices/USN-4705-1	ADVISORY
	https://ubuntu.com/security/CVE-2021-3156	REPORT
	https://ubuntu.com/security/CVE-2021-23239	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-3156",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23239",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "sudo",
            "binary_version": "1.8.16-0ubuntu1.10"
          },
          {
            "binary_name": "sudo-ldap",
            "binary_version": "1.8.16-0ubuntu1.10"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "sudo",
        "purl": "pkg:deb/ubuntu/sudo@1.8.16-0ubuntu1.10?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.16-0ubuntu1.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.12-1ubuntu3",
        "1.8.16-0ubuntu1",
        "1.8.16-0ubuntu1.1",
        "1.8.16-0ubuntu1.2",
        "1.8.16-0ubuntu1.3",
        "1.8.16-0ubuntu1.4",
        "1.8.16-0ubuntu1.5",
        "1.8.16-0ubuntu1.6",
        "1.8.16-0ubuntu1.7",
        "1.8.16-0ubuntu1.8",
        "1.8.16-0ubuntu1.9"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-3156",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23239",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "sudo",
            "binary_version": "1.8.21p2-3ubuntu1.4"
          },
          {
            "binary_name": "sudo-ldap",
            "binary_version": "1.8.21p2-3ubuntu1.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "sudo",
        "purl": "pkg:deb/ubuntu/sudo@1.8.21p2-3ubuntu1.4?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.21p2-3ubuntu1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.20p2-1ubuntu1",
        "1.8.21p2-2ubuntu1",
        "1.8.21p2-3ubuntu1",
        "1.8.21p2-3ubuntu1.1",
        "1.8.21p2-3ubuntu1.2",
        "1.8.21p2-3ubuntu1.3"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-3156",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23239",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "sudo",
            "binary_version": "1.8.31-1ubuntu1.2"
          },
          {
            "binary_name": "sudo-ldap",
            "binary_version": "1.8.31-1ubuntu1.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "sudo",
        "purl": "pkg:deb/ubuntu/sudo@1.8.31-1ubuntu1.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.31-1ubuntu1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.27-1ubuntu4",
        "1.8.29-1ubuntu1",
        "1.8.31-1ubuntu1",
        "1.8.31-1ubuntu1.1"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that Sudo incorrectly handled memory when parsing command\nlines. A local attacker could possibly use this issue to obtain unintended\naccess to the administrator account. (CVE-2021-3156)\n\nIt was discovered that the Sudo sudoedit utility incorrectly handled\nchecking directory permissions. A local attacker could possibly use this\nissue to bypass file permissions and determine if a directory exists or\nnot.  (CVE-2021-23239)\n",
  "id": "USN-4705-1",
  "modified": "2026-04-27T14:11:26Z",
  "published": "2021-01-26T18:48:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4705-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3156"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23239"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "sudo vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2021-3156",
    "UBUNTU-CVE-2021-23239"
  ]
}

usn-4705-2

Vulnerability from osv_ubuntu

Published

2021-01-27 15:01

Modified

2026-02-10 04:42

Summary

sudo vulnerability

Details

USN-4705-1 fixed a vulnerability in Sudo. This update provides the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

References

URL

Type

	https://ubuntu.com/security/notices/USN-4705-2	ADVISORY
	https://ubuntu.com/security/CVE-2021-3156	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-3156",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:14.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "sudo",
            "binary_version": "1.8.9p5-1ubuntu1.5+esm6"
          },
          {
            "binary_name": "sudo-ldap",
            "binary_version": "1.8.9p5-1ubuntu1.5+esm6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "sudo",
        "purl": "pkg:deb/ubuntu/sudo@1.8.9p5-1ubuntu1.5+esm6?arch=source\u0026distro=trusty/esm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.9p5-1ubuntu1.5+esm6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.6p3-0ubuntu3",
        "1.8.8-2ubuntu1",
        "1.8.8-2ubuntu2",
        "1.8.9p4-1ubuntu1",
        "1.8.9p4-1ubuntu2",
        "1.8.9p5-1ubuntu1",
        "1.8.9p5-1ubuntu1.1",
        "1.8.9p5-1ubuntu1.2",
        "1.8.9p5-1ubuntu1.3",
        "1.8.9p5-1ubuntu1.4",
        "1.8.9p5-1ubuntu1.5+esm1",
        "1.8.9p5-1ubuntu1.5+esm2",
        "1.8.9p5-1ubuntu1.5+esm3",
        "1.8.9p5-1ubuntu1.5+esm5"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-4705-1 fixed a vulnerability in Sudo. This update provides\nthe corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.\n\nOriginal advisory details:\n\n It was discovered that Sudo incorrectly handled memory when parsing command\n lines. A local attacker could possibly use this issue to obtain unintended\n access to the administrator account. (CVE-2021-3156)\n",
  "id": "USN-4705-2",
  "modified": "2026-02-10T04:42:02Z",
  "published": "2021-01-27T15:01:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4705-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3156"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "sudo vulnerability",
  "upstream": [
    "UBUNTU-CVE-2021-3156"
  ]
}

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.

Action not permitted

ubuntu-cve-2021-3156

Vulnerability from osv_ubuntu

CVE-2021-3156 (GCVE-0-2021-3156)

usn-4705-1

Vulnerability from osv_ubuntu

usn-4705-2

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature