CVE-2020-26950
Vulnerability from cvelistv5
Published
2020-12-09 00:19
Modified
2024-08-04 16:03
Severity ?
Summary
In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.
Impacted products
Vendor Product Version
Mozilla Firefox ESR Version: < 78.4.1
Mozilla Thunderbird Version: < 78.4.2
Show details on NVD website


{
   containers: {
      adp: [
         {
            providerMetadata: {
               dateUpdated: "2024-08-04T16:03:22.903Z",
               orgId: "af854a3a-2127-422b-91ae-364da2661108",
               shortName: "CVE",
            },
            references: [
               {
                  tags: [
                     "x_refsource_MISC",
                     "x_transferred",
                  ],
                  url: "https://bugzilla.mozilla.org/show_bug.cgi?id=1675905",
               },
               {
                  tags: [
                     "x_refsource_CONFIRM",
                     "x_transferred",
                  ],
                  url: "https://www.mozilla.org/security/advisories/mfsa2020-49/",
               },
               {
                  tags: [
                     "x_refsource_MISC",
                     "x_transferred",
                  ],
                  url: "http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html",
               },
            ],
            title: "CVE Program Container",
         },
      ],
      cna: {
         affected: [
            {
               product: "Firefox",
               vendor: "Mozilla",
               versions: [
                  {
                     status: "affected",
                     version: "< 82.0.3",
                  },
               ],
            },
            {
               product: "Firefox ESR",
               vendor: "Mozilla",
               versions: [
                  {
                     status: "affected",
                     version: "< 78.4.1",
                  },
               ],
            },
            {
               product: "Thunderbird",
               vendor: "Mozilla",
               versions: [
                  {
                     status: "affected",
                     version: "< 78.4.2",
                  },
               ],
            },
         ],
         descriptions: [
            {
               lang: "en",
               value: "In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.",
            },
         ],
         problemTypes: [
            {
               descriptions: [
                  {
                     description: "Write side effects in MCallGetProperty opcode not accounted for",
                     lang: "en",
                     type: "text",
                  },
               ],
            },
         ],
         providerMetadata: {
            dateUpdated: "2022-03-01T17:06:11",
            orgId: "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
            shortName: "mozilla",
         },
         references: [
            {
               tags: [
                  "x_refsource_MISC",
               ],
               url: "https://bugzilla.mozilla.org/show_bug.cgi?id=1675905",
            },
            {
               tags: [
                  "x_refsource_CONFIRM",
               ],
               url: "https://www.mozilla.org/security/advisories/mfsa2020-49/",
            },
            {
               tags: [
                  "x_refsource_MISC",
               ],
               url: "http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html",
            },
         ],
         x_legacyV4Record: {
            CVE_data_meta: {
               ASSIGNER: "security@mozilla.org",
               ID: "CVE-2020-26950",
               STATE: "PUBLIC",
            },
            affects: {
               vendor: {
                  vendor_data: [
                     {
                        product: {
                           product_data: [
                              {
                                 product_name: "Firefox",
                                 version: {
                                    version_data: [
                                       {
                                          version_value: "< 82.0.3",
                                       },
                                    ],
                                 },
                              },
                              {
                                 product_name: "Firefox ESR",
                                 version: {
                                    version_data: [
                                       {
                                          version_value: "< 78.4.1",
                                       },
                                    ],
                                 },
                              },
                              {
                                 product_name: "Thunderbird",
                                 version: {
                                    version_data: [
                                       {
                                          version_value: "< 78.4.2",
                                       },
                                    ],
                                 },
                              },
                           ],
                        },
                        vendor_name: "Mozilla",
                     },
                  ],
               },
            },
            data_format: "MITRE",
            data_type: "CVE",
            data_version: "4.0",
            description: {
               description_data: [
                  {
                     lang: "eng",
                     value: "In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.",
                  },
               ],
            },
            problemtype: {
               problemtype_data: [
                  {
                     description: [
                        {
                           lang: "eng",
                           value: "Write side effects in MCallGetProperty opcode not accounted for",
                        },
                     ],
                  },
               ],
            },
            references: {
               reference_data: [
                  {
                     name: "https://bugzilla.mozilla.org/show_bug.cgi?id=1675905",
                     refsource: "MISC",
                     url: "https://bugzilla.mozilla.org/show_bug.cgi?id=1675905",
                  },
                  {
                     name: "https://www.mozilla.org/security/advisories/mfsa2020-49/",
                     refsource: "CONFIRM",
                     url: "https://www.mozilla.org/security/advisories/mfsa2020-49/",
                  },
                  {
                     name: "http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html",
                     refsource: "MISC",
                     url: "http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html",
                  },
               ],
            },
         },
      },
   },
   cveMetadata: {
      assignerOrgId: "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
      assignerShortName: "mozilla",
      cveId: "CVE-2020-26950",
      datePublished: "2020-12-09T00:19:22",
      dateReserved: "2020-10-12T00:00:00",
      dateUpdated: "2024-08-04T16:03:22.903Z",
      state: "PUBLISHED",
   },
   dataType: "CVE_RECORD",
   dataVersion: "5.1",
   "vulnerability-lookup:meta": {
      nvd: "{\"cve\":{\"id\":\"CVE-2020-26950\",\"sourceIdentifier\":\"security@mozilla.org\",\"published\":\"2020-12-09T01:15:12.503\",\"lastModified\":\"2024-11-21T05:20:33.823\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\"},{\"lang\":\"es\",\"value\":\"En determinadas circunstancias, el opcode MCallGetProperty puede ser emitido con suposiciones no cumplidas, resultando en una condición de uso de la memoria previamente liberada explotable. Esta vulnerabilidad afecta a Firefox versiones anteriores a 82.0.3, Firefox ESR versiones anteriores a 78.4.1, y Thunderbird versiones anteriores a 78.4.2\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:N/C:C/I:C/A:C\",\"baseScore\":9.3,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"COMPLETE\",\"integrityImpact\":\"COMPLETE\",\"availabilityImpact\":\"COMPLETE\"},\"baseSeverity\":\"HIGH\",\"exploitabilityScore\":8.6,\"impactScore\":10.0,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":true}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"82.0.3\",\"matchCriteriaId\":\"7F743C78-6F4E-4BD7-A878-B887A2C42BDC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"78.4.1\",\"matchCriteriaId\":\"08D6779A-1193-446D-AE3E-D859D539A170\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"78.4.2\",\"matchCriteriaId\":\"635C87C4-E16B-4320-A339-45C8E1DF0401\"}]}]}],\"references\":[{\"url\":\"http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html\",\"source\":\"security@mozilla.org\",\"tags\":[\"Exploit\",\"Third Party Advisory\",\"VDB Entry\"]},{\"url\":\"https://bugzilla.mozilla.org/show_bug.cgi?id=1675905\",\"source\":\"security@mozilla.org\",\"tags\":[\"Exploit\",\"Issue Tracking\",\"Vendor Advisory\"]},{\"url\":\"https://www.mozilla.org/security/advisories/mfsa2020-49/\",\"source\":\"security@mozilla.org\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Third Party Advisory\",\"VDB Entry\"]},{\"url\":\"https://bugzilla.mozilla.org/show_bug.cgi?id=1675905\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Issue Tracking\",\"Vendor Advisory\"]},{\"url\":\"https://www.mozilla.org/security/advisories/mfsa2020-49/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Vendor Advisory\"]}]}}",
   },
}


Log in or create an account to share your comment.

Security Advisory comment format.

This schema specifies the format of a comment related to a security advisory.

UUIDv4 of the comment
UUIDv4 of the Vulnerability-Lookup instance
When the comment was created originally
When the comment was last updated
Title of the comment
Description of the comment
The identifier of the vulnerability (CVE ID, GHSA-ID, PYSEC ID, etc.).



Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.