CVE-2023-52779

{"id": "CVE-2023-52779", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"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"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-05-21T16:15:16.890", "references": [{"url": "https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-476"}]}], "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 funci\u00f3n de interfaz getattr. Cuando vfs_getattr_nosec() llama a la funci\u00f3n de interfaz getattr de un sistema de archivos, entonces 'nosec' debe propagarse a esta funci\u00f3n para que se pueda volver a llamar a vfs_getattr_nosec() desde gettattr del sistema de archivos en lugar de vfs_getattr(). Esto \u00faltimo agregar\u00eda controles de seguridad innecesarios que la llamada inicial a vfs_getattr_nosec() quer\u00eda evitar. Por lo tanto, introduzca el indicador getattr GETATTR_NOSEC y permita pasar con el nuevo par\u00e1metro getattr_flags a la funci\u00f3n de interfaz getattr. En overlayfs y ecryptfs use este indicador para determinar cu\u00e1l de las dos funciones llamar. En un cambio de c\u00f3digo reciente introducido en IMA, vfs_getattr_nosec() termin\u00f3 llamando a vfs_getattr() en overlayfs, que a su vez llam\u00f3 a security_inode_getattr() en un proceso saliente que ya no ten\u00eda current->fs configurado, lo que luego provoc\u00f3 una desreferencia del puntero NULL del kernel . Con este cambio se puede evitar la llamada a security_inode_getattr(), evitando as\u00ed la desreferencia del puntero NULL."}], "lastModified": "2025-04-02T15:02:51.383", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C5AC7A97-CD56-4012-B418-D5FF1799F8CC", "versionEndExcluding": "6.6.4", "versionStartIncluding": "6.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.7:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3A0038DE-E183-4958-A6E3-CE3821FEAFBF"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.7:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E31AD4FC-436C-44AB-BCAB-3A0B37F69EE0"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}