FKIE_CVE-2023-6857

Vulnerability from fkie_nvd - Published: 2023-12-19 14:15 - Updated: 2026-06-17 06:51
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Summary
When resolving a symlink, a race may occur where the buffer passed to `readlink` may actually be smaller than necessary. *This bug only affects Firefox on Unix-based operating systems (Android, Linux, MacOS). Windows is unaffected.* This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.
References
security@mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=1796023Issue Tracking, Permissions Required
security@mozilla.orghttps://lists.debian.org/debian-lts-announce/2023/12/msg00020.htmlMailing List, Third Party Advisory
security@mozilla.orghttps://lists.debian.org/debian-lts-announce/2023/12/msg00021.htmlMailing List, Third Party Advisory
security@mozilla.orghttps://security.gentoo.org/glsa/202401-10Third Party Advisory
security@mozilla.orghttps://www.debian.org/security/2023/dsa-5581Third Party Advisory
security@mozilla.orghttps://www.debian.org/security/2023/dsa-5582Third Party Advisory
security@mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2023-54/Vendor Advisory
security@mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2023-55/Vendor Advisory
security@mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2023-56/Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.mozilla.org/show_bug.cgi?id=1796023Issue Tracking, Permissions Required
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2023/12/msg00020.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2023/12/msg00021.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202401-10Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2023/dsa-5581Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2023/dsa-5582Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.mozilla.org/security/advisories/mfsa2023-54/Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.mozilla.org/security/advisories/mfsa2023-55/Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.mozilla.org/security/advisories/mfsa2023-56/Vendor Advisory
Impacted products
Vendor Product Version
mozilla firefox *
mozilla firefox_esr *
mozilla thunderbird *
apple macos -
google android -
linux linux_kernel -
debian debian_linux 10.0
debian debian_linux 11.0
debian debian_linux 12.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Firefox ESR",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "115.6",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "115.6",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Firefox",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "121",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "security@mozilla.org"
    }
  ],
  "configurations": [
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              "matchCriteriaId": "A3D81D72-5965-4DB7-BFA7-9A32A9108919",
              "versionEndExcluding": "121.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "46B36C5E-77B7-4FBF-8B7A-6F794C8B8B2B",
              "versionEndExcluding": "115.6",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "1856451B-B03F-4BF2-AEFE-BF66D82D9E78",
              "versionEndExcluding": "115.6",
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            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
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            },
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              "matchCriteriaId": "F8B9FEC8-73B6-43B8-B24E-1F7C20D91D26",
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            },
            {
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              "vulnerable": false
            }
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        }
      ],
      "operator": "AND"
    },
    {
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      ]
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "When resolving a symlink, a race may occur where the buffer passed to `readlink` may actually be smaller than necessary. \n*This bug only affects Firefox on Unix-based operating systems (Android, Linux, MacOS). Windows is unaffected.* This vulnerability affects Firefox ESR \u003c 115.6, Thunderbird \u003c 115.6, and Firefox \u003c 121."
    },
    {
      "lang": "es",
      "value": "Al resolver un enlace simb\u00f3lico, puede ocurrir una ejecuci\u00f3n en la que el b\u00fafer pase a \"readlink\" en realidad puede ser m\u00e1s peque\u00f1o de lo necesario. *Este error s\u00f3lo afecta a Firefox en sistemas operativos basados en Unix (Android, Linux, MacOS). Windows no se ve afectado.* Esta vulnerabilidad afecta a Firefox ESR \u0026lt; 115.6, Thunderbird \u0026lt; 115.6 y Firefox \u0026lt; 121."
    }
  ],
  "id": "CVE-2023-6857",
  "lastModified": "2026-06-17T06:51:33.417",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2023-12-19T14:15:07.377",
  "references": [
    {
      "source": "security@mozilla.org",
      "tags": [
        "Issue Tracking",
        "Permissions Required"
      ],
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    },
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    },
    {
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      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1796023"
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    {
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  ],
  "sourceIdentifier": "security@mozilla.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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