Vulnerability-Lookup

GSD-2023-52440

Vulnerability from gsd - Updated: 2024-02-21 06:01

Details

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob() If authblob->SessionKey.Length is bigger than session key size(CIFS_KEY_SIZE), slub overflow can happen in key exchange codes. cifs_arc4_crypt copy to session key array from SessionKey from client.

Aliases

CVE-2023-52440

JSON

To clipboard

{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2023-52440"
      ],
      "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()\n\nIf authblob-\u003eSessionKey.Length is bigger than session key\nsize(CIFS_KEY_SIZE), slub overflow can happen in key exchange codes.\ncifs_arc4_crypt copy to session key array from SessionKey from client.",
      "id": "GSD-2023-52440",
      "modified": "2024-02-21T06:01:53.494870Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@kernel.org",
        "ID": "CVE-2023-52440",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Linux",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "1da177e4c3f4",
                          "version_value": "bd554ed4fdc3"
                        },
                        {
                          "version_value": "not down converted",
                          "x_cve_json_5_version_data": {
                            "defaultStatus": "affected",
                            "versions": [
                              {
                                "lessThanOrEqual": "5.15.*",
                                "status": "unaffected",
                                "version": "5.15.145",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "6.1.*",
                                "status": "unaffected",
                                "version": "6.1.52",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "6.4.*",
                                "status": "unaffected",
                                "version": "6.4.15",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "6.5.*",
                                "status": "unaffected",
                                "version": "6.5.2",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "*",
                                "status": "unaffected",
                                "version": "6.6",
                                "versionType": "original_commit_for_fix"
                              }
                            ]
                          }
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Linux"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()\n\nIf authblob-\u003eSessionKey.Length is bigger than session key\nsize(CIFS_KEY_SIZE), slub overflow can happen in key exchange codes.\ncifs_arc4_crypt copy to session key array from SessionKey from client."
          }
        ]
      },
      "generator": {
        "engine": "bippy-1d0b2ea67d2d"
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "n/a"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://git.kernel.org/stable/c/bd554ed4fdc3d38404a1c43d428432577573e809",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/bd554ed4fdc3d38404a1c43d428432577573e809"
          },
          {
            "name": "https://git.kernel.org/stable/c/30fd6521b2fbd9b767e438e31945e5ea3e3a2fba",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/30fd6521b2fbd9b767e438e31945e5ea3e3a2fba"
          },
          {
            "name": "https://git.kernel.org/stable/c/7f1d6cb0eb6af3a8088dc24b7ddee9a9711538c4",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/7f1d6cb0eb6af3a8088dc24b7ddee9a9711538c4"
          },
          {
            "name": "https://git.kernel.org/stable/c/ecd7e1c562cb08e41957fcd4b0e404de5ab38e20",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/ecd7e1c562cb08e41957fcd4b0e404de5ab38e20"
          },
          {
            "name": "https://git.kernel.org/stable/c/4b081ce0d830b684fdf967abc3696d1261387254",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/4b081ce0d830b684fdf967abc3696d1261387254"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "169F25B6-7A66-437D-B095-420A0C9D2628",
                    "versionEndExcluding": "6.1.52",
                    "versionStartIncluding": "5.17.0",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "FB08B8F4-BEEF-473F-8A44-8C0DC24B919C",
                    "versionEndExcluding": "6.4.15",
                    "versionStartIncluding": "6.2.0",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "496F2478-0324-4792-B3ED-95D8884323A4",
                    "versionEndExcluding": "6.5.2",
                    "versionStartIncluding": "6.5.0",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()\n\nIf authblob-\u003eSessionKey.Length is bigger than session key\nsize(CIFS_KEY_SIZE), slub overflow can happen in key exchange codes.\ncifs_arc4_crypt copy to session key array from SessionKey from client."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ksmbd: corrige el desbordamiento de slub en ksmbd_decode_ntlmssp_auth_blob() Si authblob-\u0026gt;SessionKey.Length es mayor que el tama\u00f1o de la clave de sesi\u00f3n (CIFS_KEY_SIZE), puede ocurrir un desbordamiento de slub en los c\u00f3digos de intercambio de claves. cifs_arc4_crypt copia a la matriz de claves de sesi\u00f3n desde SessionKey del cliente."
          }
        ],
        "id": "CVE-2023-52440",
        "lastModified": "2024-03-15T13:44:59.367",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2024-02-21T08:15:45.203",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/30fd6521b2fbd9b767e438e31945e5ea3e3a2fba"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/4b081ce0d830b684fdf967abc3696d1261387254"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/7f1d6cb0eb6af3a8088dc24b7ddee9a9711538c4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/bd554ed4fdc3d38404a1c43d428432577573e809"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ecd7e1c562cb08e41957fcd4b0e404de5ab38e20"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-119"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    }
  }
}

CVE-2023-52440 (GCVE-0-2023-52440)

Vulnerability from cvelistv5 – Published: 2024-02-21 07:21 – Updated: 2026-08-15 12:23

Title

ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()

Summary

Severity

9.8 (Critical)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-10 16:02 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7063 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/bd554ed4fdc3d3840…
https://git.kernel.org/stable/c/30fd6521b2fbd9b76…
https://git.kernel.org/stable/c/7f1d6cb0eb6af3a80…
https://git.kernel.org/stable/c/ecd7e1c562cb08e41…
https://git.kernel.org/stable/c/4b081ce0d830b684f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c5049d2d73b2dc8e6bb64be633250bad1ae3d9ef , < bd554ed4fdc3d38404a1c43d428432577573e809 (git) Affected: f9929ef6a2a55f03aac61248c6a3a987b8546f2a , < 30fd6521b2fbd9b767e438e31945e5ea3e3a2fba (git) Affected: f9929ef6a2a55f03aac61248c6a3a987b8546f2a , < 7f1d6cb0eb6af3a8088dc24b7ddee9a9711538c4 (git) Affected: f9929ef6a2a55f03aac61248c6a3a987b8546f2a , < ecd7e1c562cb08e41957fcd4b0e404de5ab38e20 (git) Affected: f9929ef6a2a55f03aac61248c6a3a987b8546f2a , < 4b081ce0d830b684fdf967abc3696d1261387254 (git)
Linux	Linux	Affected: 5.17 Unaffected: 0 , < 5.17 (semver) Unaffected: 6.1.52 , ≤ 6.1.* (semver) Unaffected: 6.4.15 , ≤ 6.4.* (semver) Unaffected: 6.5.2 , ≤ 6.5.* (semver) Unaffected: 6.6 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T22:55:41.777Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/bd554ed4fdc3d38404a1c43d428432577573e809"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/30fd6521b2fbd9b767e438e31945e5ea3e3a2fba"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/7f1d6cb0eb6af3a8088dc24b7ddee9a9711538c4"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/ecd7e1c562cb08e41957fcd4b0e404de5ab38e20"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/4b081ce0d830b684fdf967abc3696d1261387254"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2023-52440",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T16:02:52.628151Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-11T17:33:31.499Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/auth.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bd554ed4fdc3d38404a1c43d428432577573e809",
              "status": "affected",
              "version": "c5049d2d73b2dc8e6bb64be633250bad1ae3d9ef",
              "versionType": "git"
            },
            {
              "lessThan": "30fd6521b2fbd9b767e438e31945e5ea3e3a2fba",
              "status": "affected",
              "version": "f9929ef6a2a55f03aac61248c6a3a987b8546f2a",
              "versionType": "git"
            },
            {
              "lessThan": "7f1d6cb0eb6af3a8088dc24b7ddee9a9711538c4",
              "status": "affected",
              "version": "f9929ef6a2a55f03aac61248c6a3a987b8546f2a",
              "versionType": "git"
            },
            {
              "lessThan": "ecd7e1c562cb08e41957fcd4b0e404de5ab38e20",
              "status": "affected",
              "version": "f9929ef6a2a55f03aac61248c6a3a987b8546f2a",
              "versionType": "git"
            },
            {
              "lessThan": "4b081ce0d830b684fdf967abc3696d1261387254",
              "status": "affected",
              "version": "f9929ef6a2a55f03aac61248c6a3a987b8546f2a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/auth.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.4.*",
              "status": "unaffected",
              "version": "6.4.15",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.5.*",
              "status": "unaffected",
              "version": "6.5.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.6",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.52",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4.15",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.5.2",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()\n\nIf authblob-\u003eSessionKey.Length is bigger than session key\nsize(CIFS_KEY_SIZE), slub overflow can happen in key exchange codes.\ncifs_arc4_crypt copy to session key array from SessionKey from client."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The bug is in ksmbd\u0027s NTLMSSP SESSION_SETUP handling (fs/smb/server/), reached over TCP/445 via the in-kernel SMB server from a remote peer with no local access required.\nAC:L - An attacker who sets NTLMSSP_NEGOTIATE_KEY_XCH and supplies SessionKey.Length \u003e CIFS_KEY_SIZE (40) reliably triggers cifs_arc4_crypt()\u0027s unbounded write into sess-\u003esess_key; no race or attacker-uncontrollable condition is required.\nPR:N - The overflow runs in the KEY_XCH path after ksmbd_auth_ntlmv2() regardless of whether authentication succeeds, so valid credentials are not required\u2014only a configured username during the pre-auth handshake, which ZDI also assessed as unauthenticated.\nUI:N - Exploitation requires only attacker-sent SMB SESSION_SETUP messages; no victim user action is needed.\nS:U - This is standard in-kernel heap corruption leading to privilege escalation within the host kernel\u0027s security authority, not a VM/IOMMU/sandbox boundary cross.\nC:H - The heap OOB write corrupts ksmbd_session fields and adjacent SLUB objects, which can be leveraged for arbitrary kernel memory disclosure under standard heap-exploitation techniques.\nI:H - Attacker-controlled-length write past the 40-byte sess_key into session pointers/keys and adjacent slab objects is an out-of-bounds write enabling control-flow hijacking and RCE, as assessed by ZDI (ZDI-24-229).\nA:H - The SLUB overflow corrupts kernel heap metadata and session structures, causing reliable kernel oops/panic and denial of service of the host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-15T12:23:46.483Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bd554ed4fdc3d38404a1c43d428432577573e809"
        },
        {
          "url": "https://git.kernel.org/stable/c/30fd6521b2fbd9b767e438e31945e5ea3e3a2fba"
        },
        {
          "url": "https://git.kernel.org/stable/c/7f1d6cb0eb6af3a8088dc24b7ddee9a9711538c4"
        },
        {
          "url": "https://git.kernel.org/stable/c/ecd7e1c562cb08e41957fcd4b0e404de5ab38e20"
        },
        {
          "url": "https://git.kernel.org/stable/c/4b081ce0d830b684fdf967abc3696d1261387254"
        }
      ],
      "title": "ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-52440",
    "datePublished": "2024-02-21T07:21:00.438Z",
    "dateReserved": "2024-02-20T12:30:33.291Z",
    "dateUpdated": "2026-08-15T12:23:46.483Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

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