CVE-2024-46744
Vulnérabilité non évaluée dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: Squashfs: sanity check symbolic link size Syzkiller reports a "KMSAN: uninit-value in pick_link" bug. This is caused by an uninitialised page, which is ultimately caused by a corrupted symbolic link size read from disk. The reason why the corrupted symlink size causes an uninitialised page is due to the following sequence of events: 1. squashfs_read_inode() is called to read the symbolic link from disk. This assigns the corrupted value 3875536935 to inode->i_size. 2. Later squashfs_symlink_read_folio() is called, which assigns this corrupted value to the length variable, which being a signed int, overflows producing a negative number. 3. The following loop that fills in the page contents checks that the copied bytes is less than length, which being negative means the loop is skipped, producing an uninitialised page. This patch adds a sanity check which checks that the symbolic link size is not larger than expected. -- V2: fix spelling mistake.
Gravité et risque d'exploitation
CVE-2024-46744 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.30 %, ce qui la place devant 21.2 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions <ef4e249971eb77ec33d74c5c3de1e2576faf6c90, <=6.1.*, <2.6.29, 0, <087f25b2d36adae19951114ffcbb7106ed405ebb, 5.15.167, <1b9451ba6f21478a75288ea3e3fca4be35e2a438, <c3af7e460a526007e4bed1ce3623274a1a6afe5e, 2.6.29, 6.10.10, <=5.10.*, <=6.6.*, 5.10.226, <810ee43d9cd245d138a2733d87a24858a23f577d, <=5.4.*, <=4.19.*, 6.1.110, 5.4.284, <fac5e82ab1334fc8ed6ff7183702df634bd1d93d, 6545b246a2c815a8fcd07d58240effb6ec3481b1, 6.11, 4.19.322, <=*, <=5.15.*, <f82cb7f24032ed023fc67d26ea9bf322d8431a90, 6.6.51, <=6.10.*, <5c8906de98d0d7ad42ff3edf2cb6cd7e0ea658c4) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.
Références
- https://git.kernel.org/stable/c/f82cb7f24032ed023fc67d26ea9bf322d8431a90
- https://git.kernel.org/stable/c/1b9451ba6f21478a75288ea3e3fca4be35e2a438
- https://git.kernel.org/stable/c/5c8906de98d0d7ad42ff3edf2cb6cd7e0ea658c4
- https://git.kernel.org/stable/c/087f25b2d36adae19951114ffcbb7106ed405ebb
- https://git.kernel.org/stable/c/fac5e82ab1334fc8ed6ff7183702df634bd1d93d
- https://git.kernel.org/stable/c/c3af7e460a526007e4bed1ce3623274a1a6afe5e
- https://git.kernel.org/stable/c/ef4e249971eb77ec33d74c5c3de1e2576faf6c90
- https://git.kernel.org/stable/c/810ee43d9cd245d138a2733d87a24858a23f577d