cve-2024-46695
Vulnerability from cvelistv5
Published
2024-09-13 05:29
Modified
2024-12-19 09:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: selinux,smack: don't bypass permissions check in inode_setsecctx hook Marek Gresko reports that the root user on an NFS client is able to change the security labels on files on an NFS filesystem that is exported with root squashing enabled. The end of the kerneldoc comment for __vfs_setxattr_noperm() states: * This function requires the caller to lock the inode's i_mutex before it * is executed. It also assumes that the caller will make the appropriate * permission checks. nfsd_setattr() does do permissions checking via fh_verify() and nfsd_permission(), but those don't do all the same permissions checks that are done by security_inode_setxattr() and its related LSM hooks do. Since nfsd_setattr() is the only consumer of security_inode_setsecctx(), simplest solution appears to be to replace the call to __vfs_setxattr_noperm() with a call to __vfs_setxattr_locked(). This fixes the above issue and has the added benefit of causing nfsd to recall conflicting delegations on a file when a client tries to change its security label.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2dbc4b7bac60b02cc6e70d05bf6a7dfd551f9dda
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/459584258d47ec3cc6245a82e8a49c9d08eb8b57Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/76a0e79bc84f466999fa501fce5bf7a07641b8a7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eebec98791d0137e455cc006411bb92a54250924
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f71ec019257ba4f7ab198bd948c5902a207bad96Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fe0cd53791119f6287b6532af8ce41576d664930
Impacted products
Vendor Product Version
Linux Linux
Show details on NVD website

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                "timestamp": "2024-09-29T15:05:47.775114Z",
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    "dateReserved": "2024-09-11T15:12:18.249Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-46695\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-09-13T06:15:14.320\",\"lastModified\":\"2024-10-17T14:15:07.517\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nselinux,smack: don\u0027t bypass permissions check in inode_setsecctx hook\\n\\nMarek Gresko reports that the root user on an NFS client is able to\\nchange the security labels on files on an NFS filesystem that is\\nexported with root squashing enabled.\\n\\nThe end of the kerneldoc comment for __vfs_setxattr_noperm() states:\\n\\n *  This function requires the caller to lock the inode\u0027s i_mutex before it\\n *  is executed. It also assumes that the caller will make the appropriate\\n *  permission checks.\\n\\nnfsd_setattr() does do permissions checking via fh_verify() and\\nnfsd_permission(), but those don\u0027t do all the same permissions checks\\nthat are done by security_inode_setxattr() and its related LSM hooks do.\\n\\nSince nfsd_setattr() is the only consumer of security_inode_setsecctx(),\\nsimplest solution appears to be to replace the call to\\n__vfs_setxattr_noperm() with a call to __vfs_setxattr_locked().  This\\nfixes the above issue and has the added benefit of causing nfsd to\\nrecall conflicting delegations on a file when a client tries to change\\nits security label.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: selinux,smack: no omitir la comprobaci\u00f3n de permisos en el gancho inode_setsecctx Marek Gresko informa que el usuario root en un cliente NFS puede cambiar las etiquetas de seguridad en los archivos de un sistema de archivos NFS que se exporta con el squashing de root habilitado. El final del comentario de kerneldoc para __vfs_setxattr_noperm() indica: * Esta funci\u00f3n requiere que el llamador bloquee el i_mutex del inodo antes de * que se ejecute. Tambi\u00e9n supone que el llamador realizar\u00e1 las comprobaciones de permisos * apropiadas. nfsd_setattr() realiza comprobaciones de permisos a trav\u00e9s de fh_verify() y nfsd_permission(), pero estos no realizan todas las mismas comprobaciones de permisos que realizan security_inode_setxattr() y sus ganchos LSM relacionados. Dado que nfsd_setattr() es el \u00fanico consumidor de security_inode_setsecctx(), la soluci\u00f3n m\u00e1s sencilla parece ser reemplazar la llamada a __vfs_setxattr_noperm() con una llamada a __vfs_setxattr_locked(). Esto soluciona el problema anterior y tiene el beneficio adicional de hacer que nfsd recupere las delegaciones conflictivas en un archivo cuando un cliente intenta cambiar su etiqueta de seguridad.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N\",\"baseScore\":4.4,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":0.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-276\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"6.6.49\",\"matchCriteriaId\":\"38247147-5175-4559-99A6-B52AFFA284EA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.8\",\"matchCriteriaId\":\"1B5D46C3-56A4-4380-9309-27BF73DF29A7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"8B3CE743-2126-47A3-8B7C-822B502CF119\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4DEB27E7-30AA-45CC-8934-B89263EF3551\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"E0005AEF-856E-47EB-BFE4-90C46899394D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"39889A68-6D34-47A6-82FC-CD0BF23D6754\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"B8383ABF-1457-401F-9B61-EE50F4C61F4F\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2dbc4b7bac60b02cc6e70d05bf6a7dfd551f9dda\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/459584258d47ec3cc6245a82e8a49c9d08eb8b57\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/76a0e79bc84f466999fa501fce5bf7a07641b8a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/eebec98791d0137e455cc006411bb92a54250924\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f71ec019257ba4f7ab198bd948c5902a207bad96\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fe0cd53791119f6287b6532af8ce41576d664930\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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