gsd-2021-20254
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
A flaw was found in samba. The Samba smbd file server must map Windows group identities (SIDs) into unix group ids (gids). The code that performs this had a flaw that could allow it to read data beyond the end of the array in the case where a negative cache entry had been added to the mapping cache. This could cause the calling code to return those values into the process token that stores the group membership for a user. The highest threat from this vulnerability is to data confidentiality and integrity.
Aliases
Aliases
CVE-2021-20254


To clipboard 

{
   GSD: {
      alias: "CVE-2021-20254",
      description: "A flaw was found in samba. The Samba smbd file server must map Windows group identities (SIDs) into unix group ids (gids). The code that performs this had a flaw that could allow it to read data beyond the end of the array in the case where a negative cache entry had been added to the mapping cache. This could cause the calling code to return those values into the process token that stores the group membership for a user. The highest threat from this vulnerability is to data confidentiality and integrity.",
      id: "GSD-2021-20254",
      references: [
         "https://www.suse.com/security/cve/CVE-2021-20254.html",
         "https://access.redhat.com/errata/RHSA-2021:4866",
         "https://access.redhat.com/errata/RHSA-2021:4058",
         "https://access.redhat.com/errata/RHSA-2021:3988",
         "https://access.redhat.com/errata/RHSA-2021:3724",
         "https://access.redhat.com/errata/RHSA-2021:3723",
         "https://access.redhat.com/errata/RHSA-2021:2313",
         "https://ubuntu.com/security/CVE-2021-20254",
         "https://advisories.mageia.org/CVE-2021-20254.html",
         "https://security.archlinux.org/CVE-2021-20254",
         "https://alas.aws.amazon.com/cve/html/CVE-2021-20254.html",
         "https://linux.oracle.com/cve/CVE-2021-20254.html",
      ],
   },
   gsd: {
      metadata: {
         exploitCode: "unknown",
         remediation: "unknown",
         reportConfidence: "confirmed",
         type: "vulnerability",
      },
      osvSchema: {
         aliases: [
            "CVE-2021-20254",
         ],
         details: "A flaw was found in samba. The Samba smbd file server must map Windows group identities (SIDs) into unix group ids (gids). The code that performs this had a flaw that could allow it to read data beyond the end of the array in the case where a negative cache entry had been added to the mapping cache. This could cause the calling code to return those values into the process token that stores the group membership for a user. The highest threat from this vulnerability is to data confidentiality and integrity.",
         id: "GSD-2021-20254",
         modified: "2023-12-13T01:23:12.383968Z",
         schema_version: "1.4.0",
      },
   },
   namespaces: {
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         CVE_data_meta: {
            ASSIGNER: "secalert@redhat.com",
            ID: "CVE-2021-20254",
            STATE: "PUBLIC",
         },
         affects: {
            vendor: {
               vendor_data: [
                  {
                     product: {
                        product_data: [
                           {
                              product_name: "samba",
                              version: {
                                 version_data: [
                                    {
                                       version_value: "samba 4.14.1, samba 4.13.6, samba 4.12.13",
                                    },
                                 ],
                              },
                           },
                        ],
                     },
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                  },
               ],
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         data_format: "MITRE",
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               },
            ],
         },
         problemtype: {
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         references: {
            reference_data: [
               {
                  name: "https://bugzilla.redhat.com/show_bug.cgi?id=1949442",
                  refsource: "MISC",
                  url: "https://bugzilla.redhat.com/show_bug.cgi?id=1949442",
               },
               {
                  name: "https://www.samba.org/samba/security/CVE-2021-20254.html",
                  refsource: "MISC",
                  url: "https://www.samba.org/samba/security/CVE-2021-20254.html",
               },
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               },
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                  refsource: "FEDORA",
                  url: "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3EP2VJ73OVBPVSOSTVOMGIEQA3MWF6F7/",
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               },
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               },
               {
                  name: "[debian-lts-announce] 20210529 [SECURITY] [DLA 2668-1] samba security update",
                  refsource: "MLIST",
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               },
            ],
         },
      },
      "nvd.nist.gov": {
         configurations: {
            CVE_data_version: "4.0",
            nodes: [
               {
                  children: [],
                  cpe_match: [
                     {
                        cpe23Uri: "cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*",
                        cpe_name: [],
                        versionEndExcluding: "4.12.15",
                        versionStartIncluding: "3.6.0",
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                     },
                     {
                        cpe23Uri: "cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*",
                        cpe_name: [],
                        versionEndExcluding: "4.13.8",
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                     },
                     {
                        cpe23Uri: "cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*",
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                     {
                        cpe23Uri: "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
                        cpe_name: [],
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                  operator: "OR",
               },
               {
                  children: [],
                  cpe_match: [
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                     },
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                        cpe_name: [],
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                  operator: "OR",
               },
               {
                  children: [],
                  cpe_match: [
                     {
                        cpe23Uri: "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
                        cpe_name: [],
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                     },
                  ],
                  operator: "OR",
               },
            ],
         },
         cve: {
            CVE_data_meta: {
               ASSIGNER: "secalert@redhat.com",
               ID: "CVE-2021-20254",
            },
            data_format: "MITRE",
            data_type: "CVE",
            data_version: "4.0",
            description: {
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                  {
                     lang: "en",
                     value: "A flaw was found in samba. The Samba smbd file server must map Windows group identities (SIDs) into unix group ids (gids). The code that performs this had a flaw that could allow it to read data beyond the end of the array in the case where a negative cache entry had been added to the mapping cache. This could cause the calling code to return those values into the process token that stores the group membership for a user. The highest threat from this vulnerability is to data confidentiality and integrity.",
                  },
               ],
            },
            problemtype: {
               problemtype_data: [
                  {
                     description: [
                        {
                           lang: "en",
                           value: "CWE-125",
                        },
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               ],
            },
            references: {
               reference_data: [
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                     name: "https://security.netapp.com/advisory/ntap-20210430-0001/",
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                     tags: [
                        "Third Party Advisory",
                     ],
                     url: "https://security.netapp.com/advisory/ntap-20210430-0001/",
                  },
                  {
                     name: "https://www.samba.org/samba/security/CVE-2021-20254.html",
                     refsource: "MISC",
                     tags: [
                        "Vendor Advisory",
                     ],
                     url: "https://www.samba.org/samba/security/CVE-2021-20254.html",
                  },
                  {
                     name: "https://bugzilla.redhat.com/show_bug.cgi?id=1949442",
                     refsource: "MISC",
                     tags: [
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                  },
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                  },
                  {
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                     ],
                     url: "https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html",
                  },
               ],
            },
         },
         impact: {
            baseMetricV2: {
               acInsufInfo: false,
               cvssV2: {
                  accessComplexity: "MEDIUM",
                  accessVector: "NETWORK",
                  authentication: "SINGLE",
                  availabilityImpact: "NONE",
                  baseScore: 4.9,
                  confidentialityImpact: "PARTIAL",
                  integrityImpact: "PARTIAL",
                  vectorString: "AV:N/AC:M/Au:S/C:P/I:P/A:N",
                  version: "2.0",
               },
               exploitabilityScore: 6.8,
               impactScore: 4.9,
               obtainAllPrivilege: false,
               obtainOtherPrivilege: false,
               obtainUserPrivilege: false,
               severity: "MEDIUM",
               userInteractionRequired: false,
            },
            baseMetricV3: {
               cvssV3: {
                  attackComplexity: "HIGH",
                  attackVector: "NETWORK",
                  availabilityImpact: "NONE",
                  baseScore: 6.8,
                  baseSeverity: "MEDIUM",
                  confidentialityImpact: "HIGH",
                  integrityImpact: "HIGH",
                  privilegesRequired: "LOW",
                  scope: "UNCHANGED",
                  userInteraction: "NONE",
                  vectorString: "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
                  version: "3.1",
               },
               exploitabilityScore: 1.6,
               impactScore: 5.2,
            },
         },
         lastModifiedDate: "2021-06-24T18:30Z",
         publishedDate: "2021-05-05T14:15Z",
      },
   },
}


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