CVE-2024-46695

{"id": "CVE-2024-46695", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.4, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "HIGH", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 0.8}]}, "published": "2024-09-13T06:15:14.320", "references": [{"url": "https://git.kernel.org/stable/c/2dbc4b7bac60b02cc6e70d05bf6a7dfd551f9dda", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/459584258d47ec3cc6245a82e8a49c9d08eb8b57", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/76a0e79bc84f466999fa501fce5bf7a07641b8a7", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/eebec98791d0137e455cc006411bb92a54250924", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f71ec019257ba4f7ab198bd948c5902a207bad96", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fe0cd53791119f6287b6532af8ce41576d664930", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-276"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nselinux,smack: don't 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's 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't 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."}], "lastModified": "2024-10-17T14:15:07.517", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "38247147-5175-4559-99A6-B52AFFA284EA", "versionEndExcluding": "6.6.49"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1B5D46C3-56A4-4380-9309-27BF73DF29A7", "versionEndExcluding": "6.10.8", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8B3CE743-2126-47A3-8B7C-822B502CF119"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4DEB27E7-30AA-45CC-8934-B89263EF3551"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E0005AEF-856E-47EB-BFE4-90C46899394D"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "39889A68-6D34-47A6-82FC-CD0BF23D6754"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B8383ABF-1457-401F-9B61-EE50F4C61F4F"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}