fkie_cve-2021-20254
Vulnerability from fkie_nvd
Published
2021-05-05 14:15
Modified
2024-11-21 05:46
Severity ?
6.8 (Medium) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Summary
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.
References
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1949442Issue Tracking, Third Party Advisory
secalert@redhat.comhttps://lists.debian.org/debian-lts-announce/2021/05/msg00023.htmlMailing List, Third Party Advisory
secalert@redhat.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3EP2VJ73OVBPVSOSTVOMGIEQA3MWF6F7/
secalert@redhat.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZAF6L2M6CNAJ2YYYGXPWETTW5YLCWTVT/
secalert@redhat.comhttps://security.gentoo.org/glsa/202105-22Third Party Advisory
secalert@redhat.comhttps://security.netapp.com/advisory/ntap-20210430-0001/Third Party Advisory
secalert@redhat.comhttps://www.samba.org/samba/security/CVE-2021-20254.htmlVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=1949442Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2021/05/msg00023.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3EP2VJ73OVBPVSOSTVOMGIEQA3MWF6F7/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZAF6L2M6CNAJ2YYYGXPWETTW5YLCWTVT/
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202105-22Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20210430-0001/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.samba.org/samba/security/CVE-2021-20254.htmlVendor Advisory
Impacted products
Vendor Product Version
samba samba *
samba samba *
samba samba *
fedoraproject fedora 32
fedoraproject fedora 33
redhat enterprise_linux 7.0
redhat enterprise_linux 8.0
debian debian_linux 9.0


To clipboard 

{
   configurations: [
      {
         nodes: [
            {
               cpeMatch: [
                  {
                     criteria: "cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "B84DE447-47C2-4AFB-867C-20D372058366",
                     versionEndExcluding: "4.12.15",
                     versionStartIncluding: "3.6.0",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "1B8AF688-C755-4E0A-A80E-D74BF89678D6",
                     versionEndExcluding: "4.13.8",
                     versionStartIncluding: "4.13.0",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "145DC5A1-4F1B-41BC-8B13-CB270B960BA0",
                     versionEndExcluding: "4.14.4",
                     versionStartIncluding: "4.14.0",
                     vulnerable: true,
                  },
               ],
               negate: false,
               operator: "OR",
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      {
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                     matchCriteriaId: "36D96259-24BD-44E2-96D9-78CE1D41F956",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
                     matchCriteriaId: "E460AA51-FCDA-46B9-AE97-E6676AA5E194",
                     vulnerable: true,
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      {
         nodes: [
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                     vulnerable: true,
                  },
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         ],
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   ],
   cveTags: [],
   descriptions: [
      {
         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.",
      },
      {
         lang: "es",
         value: "Se encontró un fallo en samba. El servidor de archivos smbd de Samba debe asignar Windows group identities (SIDs) a unix group ids (gids). El código que lleva a cabo esto tenía un fallo que podría permitirle leer datos más allá del final de la matriz en el caso de que se hubiera agregado una entrada de caché negativa a la caché de mapeo. Esto podría causar que el código de llamada devuelva esos valores al token de proceso que almacena la pertenencia al grupo de un usuario. La mayor amenaza de esta vulnerabilidad es la confidencialidad e integridad de los datos",
      },
   ],
   id: "CVE-2021-20254",
   lastModified: "2024-11-21T05:46:13.203",
   metrics: {
      cvssMetricV2: [
         {
            acInsufInfo: false,
            baseSeverity: "MEDIUM",
            cvssData: {
               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,
            source: "nvd@nist.gov",
            type: "Primary",
            userInteractionRequired: false,
         },
      ],
      cvssMetricV31: [
         {
            cvssData: {
               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,
            source: "nvd@nist.gov",
            type: "Primary",
         },
      ],
   },
   published: "2021-05-05T14:15:07.883",
   references: [
      {
         source: "secalert@redhat.com",
         tags: [
            "Issue Tracking",
            "Third Party Advisory",
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         url: "https://bugzilla.redhat.com/show_bug.cgi?id=1949442",
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      },
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         url: "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3EP2VJ73OVBPVSOSTVOMGIEQA3MWF6F7/",
      },
      {
         source: "secalert@redhat.com",
         url: "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZAF6L2M6CNAJ2YYYGXPWETTW5YLCWTVT/",
      },
      {
         source: "secalert@redhat.com",
         tags: [
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         url: "https://security.gentoo.org/glsa/202105-22",
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      {
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         url: "https://security.netapp.com/advisory/ntap-20210430-0001/",
      },
      {
         source: "secalert@redhat.com",
         tags: [
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         url: "https://www.samba.org/samba/security/CVE-2021-20254.html",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
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         url: "https://bugzilla.redhat.com/show_bug.cgi?id=1949442",
      },
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      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZAF6L2M6CNAJ2YYYGXPWETTW5YLCWTVT/",
      },
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         url: "https://www.samba.org/samba/security/CVE-2021-20254.html",
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   ],
   sourceIdentifier: "secalert@redhat.com",
   vulnStatus: "Modified",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "CWE-125",
            },
         ],
         source: "secalert@redhat.com",
         type: "Primary",
      },
   ],
}


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