cve-2023-52779
Vulnerability from cvelistv5
Published
2024-05-21 15:30
Modified
2024-12-19 08:25
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: fs: Pass AT_GETATTR_NOSEC flag to getattr interface function When vfs_getattr_nosec() calls a filesystem's getattr interface function then the 'nosec' should propagate into this function so that vfs_getattr_nosec() can again be called from the filesystem's gettattr rather than vfs_getattr(). The latter would add unnecessary security checks that the initial vfs_getattr_nosec() call wanted to avoid. Therefore, introduce the getattr flag GETATTR_NOSEC and allow to pass with the new getattr_flags parameter to the getattr interface function. In overlayfs and ecryptfs use this flag to determine which one of the two functions to call. In a recent code change introduced to IMA vfs_getattr_nosec() ended up calling vfs_getattr() in overlayfs, which in turn called security_inode_getattr() on an exiting process that did not have current->fs set anymore, which then caused a kernel NULL pointer dereference. With this change the call to security_inode_getattr() can be avoided, thus avoiding the NULL pointer dereference.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf
Impacted products
Vendor Product Version
Linux Linux Version: db1d1e8b9867aae5c3e61ad7859abfcc4a6fd6c7
Version: db1d1e8b9867aae5c3e61ad7859abfcc4a6fd6c7
 Create a notification for this product.
   Linux Linux Version: 6.5
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
   containers: {
      adp: [
         {
            metrics: [
               {
                  cvssV3_1: {
                     attackComplexity: "LOW",
                     attackVector: "LOCAL",
                     availabilityImpact: "HIGH",
                     baseScore: 5.5,
                     baseSeverity: "MEDIUM",
                     confidentialityImpact: "NONE",
                     integrityImpact: "NONE",
                     privilegesRequired: "LOW",
                     scope: "UNCHANGED",
                     userInteraction: "NONE",
                     vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                     version: "3.1",
                  },
               },
               {
                  other: {
                     content: {
                        id: "CVE-2023-52779",
                        options: [
                           {
                              Exploitation: "none",
                           },
                           {
                              Automatable: "no",
                           },
                           {
                              "Technical Impact": "partial",
                           },
                        ],
                        role: "CISA Coordinator",
                        timestamp: "2024-05-29T18:48:07.766160Z",
                        version: "2.0.3",
                     },
                     type: "ssvc",
                  },
               },
            ],
            problemTypes: [
               {
                  descriptions: [
                     {
                        description: "CWE-noinfo Not enough information",
                        lang: "en",
                        type: "CWE",
                     },
                  ],
               },
            ],
            providerMetadata: {
               dateUpdated: "2024-11-06T14:23:53.810Z",
               orgId: "134c704f-9b21-4f2e-91b3-4a467353bcc0",
               shortName: "CISA-ADP",
            },
            title: "CISA ADP Vulnrichment",
         },
         {
            providerMetadata: {
               dateUpdated: "2024-08-02T23:11:36.013Z",
               orgId: "af854a3a-2127-422b-91ae-364da2661108",
               shortName: "CVE",
            },
            references: [
               {
                  tags: [
                     "x_transferred",
                  ],
                  url: "https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4",
               },
               {
                  tags: [
                     "x_transferred",
                  ],
                  url: "https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf",
               },
            ],
            title: "CVE Program Container",
         },
      ],
      cna: {
         affected: [
            {
               defaultStatus: "unaffected",
               product: "Linux",
               programFiles: [
                  "fs/ecryptfs/inode.c",
                  "fs/overlayfs/inode.c",
                  "fs/overlayfs/overlayfs.h",
                  "fs/stat.c",
                  "include/uapi/linux/fcntl.h",
               ],
               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     lessThan: "3fb0fa08641903304b9d81d52a379ff031dc41d4",
                     status: "affected",
                     version: "db1d1e8b9867aae5c3e61ad7859abfcc4a6fd6c7",
                     versionType: "git",
                  },
                  {
                     lessThan: "8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf",
                     status: "affected",
                     version: "db1d1e8b9867aae5c3e61ad7859abfcc4a6fd6c7",
                     versionType: "git",
                  },
               ],
            },
            {
               defaultStatus: "affected",
               product: "Linux",
               programFiles: [
                  "fs/ecryptfs/inode.c",
                  "fs/overlayfs/inode.c",
                  "fs/overlayfs/overlayfs.h",
                  "fs/stat.c",
                  "include/uapi/linux/fcntl.h",
               ],
               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     status: "affected",
                     version: "6.5",
                  },
                  {
                     lessThan: "6.5",
                     status: "unaffected",
                     version: "0",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.6.*",
                     status: "unaffected",
                     version: "6.6.4",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "*",
                     status: "unaffected",
                     version: "6.7",
                     versionType: "original_commit_for_fix",
                  },
               ],
            },
         ],
         descriptions: [
            {
               lang: "en",
               value: "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: Pass AT_GETATTR_NOSEC flag to getattr interface function\n\nWhen vfs_getattr_nosec() calls a filesystem's getattr interface function\nthen the 'nosec' should propagate into this function so that\nvfs_getattr_nosec() can again be called from the filesystem's gettattr\nrather than vfs_getattr(). The latter would add unnecessary security\nchecks that the initial vfs_getattr_nosec() call wanted to avoid.\nTherefore, introduce the getattr flag GETATTR_NOSEC and allow to pass\nwith the new getattr_flags parameter to the getattr interface function.\nIn overlayfs and ecryptfs use this flag to determine which one of the\ntwo functions to call.\n\nIn a recent code change introduced to IMA vfs_getattr_nosec() ended up\ncalling vfs_getattr() in overlayfs, which in turn called\nsecurity_inode_getattr() on an exiting process that did not have\ncurrent->fs set anymore, which then caused a kernel NULL pointer\ndereference. With this change the call to security_inode_getattr() can\nbe avoided, thus avoiding the NULL pointer dereference.",
            },
         ],
         providerMetadata: {
            dateUpdated: "2024-12-19T08:25:48.331Z",
            orgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            shortName: "Linux",
         },
         references: [
            {
               url: "https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4",
            },
            {
               url: "https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf",
            },
         ],
         title: "fs: Pass AT_GETATTR_NOSEC flag to getattr interface function",
         x_generator: {
            engine: "bippy-5f407fcff5a0",
         },
      },
   },
   cveMetadata: {
      assignerOrgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      assignerShortName: "Linux",
      cveId: "CVE-2023-52779",
      datePublished: "2024-05-21T15:30:58.899Z",
      dateReserved: "2024-05-21T15:19:24.240Z",
      dateUpdated: "2024-12-19T08:25:48.331Z",
      state: "PUBLISHED",
   },
   dataType: "CVE_RECORD",
   dataVersion: "5.1",
   "vulnerability-lookup:meta": {
      nvd: "{\"cve\":{\"id\":\"CVE-2023-52779\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T16:15:16.890\",\"lastModified\":\"2024-11-21T08:40:34.283\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfs: Pass AT_GETATTR_NOSEC flag to getattr interface function\\n\\nWhen vfs_getattr_nosec() calls a filesystem's getattr interface function\\nthen the 'nosec' should propagate into this function so that\\nvfs_getattr_nosec() can again be called from the filesystem's gettattr\\nrather than vfs_getattr(). The latter would add unnecessary security\\nchecks that the initial vfs_getattr_nosec() call wanted to avoid.\\nTherefore, introduce the getattr flag GETATTR_NOSEC and allow to pass\\nwith the new getattr_flags parameter to the getattr interface function.\\nIn overlayfs and ecryptfs use this flag to determine which one of the\\ntwo functions to call.\\n\\nIn a recent code change introduced to IMA vfs_getattr_nosec() ended up\\ncalling vfs_getattr() in overlayfs, which in turn called\\nsecurity_inode_getattr() on an exiting process that did not have\\ncurrent->fs set anymore, which then caused a kernel NULL pointer\\ndereference. With this change the call to security_inode_getattr() can\\nbe avoided, thus avoiding the NULL pointer dereference.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs: pasar el indicador AT_GETATTR_NOSEC a la función de interfaz getattr. Cuando vfs_getattr_nosec() llama a la función de interfaz getattr de un sistema de archivos, entonces 'nosec' debe propagarse a esta función para que se pueda volver a llamar a vfs_getattr_nosec() desde gettattr del sistema de archivos en lugar de vfs_getattr(). Esto último agregaría controles de seguridad innecesarios que la llamada inicial a vfs_getattr_nosec() quería evitar. Por lo tanto, introduzca el indicador getattr GETATTR_NOSEC y permita pasar con el nuevo parámetro getattr_flags a la función de interfaz getattr. En overlayfs y ecryptfs use este indicador para determinar cuál de las dos funciones llamar. En un cambio de código reciente introducido en IMA, vfs_getattr_nosec() terminó llamando a vfs_getattr() en overlayfs, que a su vez llamó a security_inode_getattr() en un proceso saliente que ya no tenía current->fs configurado, lo que luego provocó una desreferencia del puntero NULL del kernel . Con este cambio se puede evitar la llamada a security_inode_getattr(), evitando así la desreferencia del puntero NULL.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
      vulnrichment: {
         containers: "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T23:11:36.013Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-52779\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-05-29T18:48:07.766160Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"description\": \"CWE-noinfo Not enough information\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-29T18:48:11.625Z\"}}], \"cna\": {\"title\": \"fs: Pass AT_GETATTR_NOSEC flag to getattr interface function\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"db1d1e8b9867aae5c3e61ad7859abfcc4a6fd6c7\", \"lessThan\": \"3fb0fa08641903304b9d81d52a379ff031dc41d4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"db1d1e8b9867aae5c3e61ad7859abfcc4a6fd6c7\", \"lessThan\": \"8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/ecryptfs/inode.c\", \"fs/overlayfs/inode.c\", \"fs/overlayfs/overlayfs.h\", \"fs/stat.c\", \"include/uapi/linux/fcntl.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ecryptfs/inode.c\", \"fs/overlayfs/inode.c\", \"fs/overlayfs/overlayfs.h\", \"fs/stat.c\", \"include/uapi/linux/fcntl.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4\"}, {\"url\": \"https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfs: Pass AT_GETATTR_NOSEC flag to getattr interface function\\n\\nWhen vfs_getattr_nosec() calls a filesystem's getattr interface function\\nthen the 'nosec' should propagate into this function so that\\nvfs_getattr_nosec() can again be called from the filesystem's gettattr\\nrather than vfs_getattr(). The latter would add unnecessary security\\nchecks that the initial vfs_getattr_nosec() call wanted to avoid.\\nTherefore, introduce the getattr flag GETATTR_NOSEC and allow to pass\\nwith the new getattr_flags parameter to the getattr interface function.\\nIn overlayfs and ecryptfs use this flag to determine which one of the\\ntwo functions to call.\\n\\nIn a recent code change introduced to IMA vfs_getattr_nosec() ended up\\ncalling vfs_getattr() in overlayfs, which in turn called\\nsecurity_inode_getattr() on an exiting process that did not have\\ncurrent->fs set anymore, which then caused a kernel NULL pointer\\ndereference. With this change the call to security_inode_getattr() can\\nbe avoided, thus avoiding the NULL pointer dereference.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T08:25:48.331Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2023-52779\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T08:25:48.331Z\", \"dateReserved\": \"2024-05-21T15:19:24.240Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:30:58.899Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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.




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.