CVE-2024-46744

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2024-46744
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.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/087f25b2d36adae19951114ffcbb7106ed405ebb Patch
https://git.kernel.org/stable/c/1b9451ba6f21478a75288ea3e3fca4be35e2a438 Patch
https://git.kernel.org/stable/c/5c8906de98d0d7ad42ff3edf2cb6cd7e0ea658c4 Patch
https://git.kernel.org/stable/c/810ee43d9cd245d138a2733d87a24858a23f577d Patch
https://git.kernel.org/stable/c/c3af7e460a526007e4bed1ce3623274a1a6afe5e Patch
https://git.kernel.org/stable/c/ef4e249971eb77ec33d74c5c3de1e2576faf6c90 Patch
https://git.kernel.org/stable/c/f82cb7f24032ed023fc67d26ea9bf322d8431a90 Patch
https://git.kernel.org/stable/c/fac5e82ab1334fc8ed6ff7183702df634bd1d93d Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*
History

30 Sep 2024, 13:36

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
CPE cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8
References () https://git.kernel.org/stable/c/087f25b2d36adae19951114ffcbb7106ed405ebb - () https://git.kernel.org/stable/c/087f25b2d36adae19951114ffcbb7106ed405ebb - Patch
References () https://git.kernel.org/stable/c/1b9451ba6f21478a75288ea3e3fca4be35e2a438 - () https://git.kernel.org/stable/c/1b9451ba6f21478a75288ea3e3fca4be35e2a438 - Patch
References () https://git.kernel.org/stable/c/5c8906de98d0d7ad42ff3edf2cb6cd7e0ea658c4 - () https://git.kernel.org/stable/c/5c8906de98d0d7ad42ff3edf2cb6cd7e0ea658c4 - Patch
References () https://git.kernel.org/stable/c/810ee43d9cd245d138a2733d87a24858a23f577d - () https://git.kernel.org/stable/c/810ee43d9cd245d138a2733d87a24858a23f577d - Patch
References () https://git.kernel.org/stable/c/c3af7e460a526007e4bed1ce3623274a1a6afe5e - () https://git.kernel.org/stable/c/c3af7e460a526007e4bed1ce3623274a1a6afe5e - Patch
References () https://git.kernel.org/stable/c/ef4e249971eb77ec33d74c5c3de1e2576faf6c90 - () https://git.kernel.org/stable/c/ef4e249971eb77ec33d74c5c3de1e2576faf6c90 - Patch
References () https://git.kernel.org/stable/c/f82cb7f24032ed023fc67d26ea9bf322d8431a90 - () https://git.kernel.org/stable/c/f82cb7f24032ed023fc67d26ea9bf322d8431a90 - Patch
References () https://git.kernel.org/stable/c/fac5e82ab1334fc8ed6ff7183702df634bd1d93d - () https://git.kernel.org/stable/c/fac5e82ab1334fc8ed6ff7183702df634bd1d93d - Patch
CWE CWE-59

20 Sep 2024, 12:30

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Squashfs: comprobación de la integridad del tamaño del enlace simbólico Syzkiller informa de un error "KMSAN: uninit-value in pick_link". Esto se debe a una página no inicializada, que en última instancia se debe a un tamaño de enlace simbólico dañado leído desde el disco. La razón por la que el tamaño de enlace simbólico dañado provoca una página no inicializada se debe a la siguiente secuencia de eventos: 1. Se llama a squashfs_read_inode() para leer el enlace simbólico desde el disco. Esto asigna el valor dañado 3875536935 a inode->i_size. 2. Más tarde se llama a squashfs_symlink_read_folio(), que asigna este valor dañado a la variable length, que, al ser un int con signo, se desborda produciendo un número negativo. 3. El siguiente bucle que rellena el contenido de la página comprueba que los bytes copiados sean menores que length, que, al ser negativo, significa que se omite el bucle, lo que produce una página no inicializada. Este parche agrega una verificación de cordura que verifica que el tamaño del enlace simbólico no sea mayor al esperado. -- V2: corrige error ortográfico.

18 Sep 2024, 08:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-09-18 08:15

Updated : 2024-09-30 13:36

NVD link : CVE-2024-46744

Mitre link : CVE-2024-46744

CVE.ORG link : CVE-2024-46744

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-59

Improper Link Resolution Before File Access ('Link Following')