CVE-2021-47458

ocfs2: mount fails with buffer overflow in strlen

Severity Score

"-"

*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

In the Linux kernel, the following vulnerability has been resolved:

ocfs2: mount fails with buffer overflow in strlen

Starting with kernel 5.11 built with CONFIG_FORTIFY_SOURCE mouting an
ocfs2 filesystem with either o2cb or pcmk cluster stack fails with the
trace below. Problem seems to be that strings for cluster stack and
cluster name are not guaranteed to be null terminated in the disk
representation, while strlcpy assumes that the source string is always
null terminated. This causes a read outside of the source string
triggering the buffer overflow detection.

detected buffer overflow in strlen
------------[ cut here ]------------
kernel BUG at lib/string.c:1149!
invalid opcode: 0000 [#1] SMP PTI
CPU: 1 PID: 910 Comm: mount.ocfs2 Not tainted 5.14.0-1-amd64 #1
Debian 5.14.6-2
RIP: 0010:fortify_panic+0xf/0x11
...
Call Trace:
ocfs2_initialize_super.isra.0.cold+0xc/0x18 [ocfs2]
ocfs2_fill_super+0x359/0x19b0 [ocfs2]
mount_bdev+0x185/0x1b0
legacy_get_tree+0x27/0x40
vfs_get_tree+0x25/0xb0
path_mount+0x454/0xa20
__x64_sys_mount+0x103/0x140
do_syscall_64+0x3b/0xc0
entry_SYSCALL_64_after_hwframe+0x44/0xae

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: ocfs2: el montaje falla con desbordamiento del búfer en strlen. A partir del kernel 5.11 compilado con CONFIG_FORTIFY_SOURCE, la conexión de un sistema de archivos ocfs2 con una pila de clúster o2cb o pcmk falla con el siguiente seguimiento. El problema parece ser que no se garantiza que las cadenas para la pila del clúster y el nombre del clúster tengan terminación nula en la representación del disco, mientras que strlcpy supone que la cadena de origen siempre termina en nulo. Esto provoca una lectura fuera de la cadena de origen que activa la detección de desbordamiento del búfer. se detectó desbordamiento del búfer en strlen ------------[ cortar aquí ]------------ ¡ERROR del kernel en lib/string.c:1149! código de operación no válido: 0000 [#1] SMP PTI CPU: 1 PID: 910 Comm: mount.ocfs2 No contaminado 5.14.0-1-amd64 #1 Debian 5.14.6-2 RIP: 0010:fortify_panic+0xf/0x11... Seguimiento de llamadas: ocfs2_initialize_super.isra.0.cold+0xc/0x18 [ocfs2] ocfs2_fill_super+0x359/0x19b0 [ocfs2] mount_bdev+0x185/0x1b0 Legacy_get_tree+0x27/0x40 vfs_get_tree+0x25/0xb0 xa20 __x64_sys_mount+0x103/0x140 do_syscall_64+0x3b/0xc0 entrada_SYSCALL_64_after_hwframe+0x44/0xae

*Credits: N/A

CVSS Scores

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-05-21 CVE Reserved
2024-05-22 CVE Published
2024-05-22 EPSS Updated
2024-11-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (8)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/ac011cb3ff7a76b3e0e6e77158ee4ba2f929e1fb	2021-10-27
https://git.kernel.org/stable/c/4b74ddcc22ee6455946e80a9c4808801f8f8561e	2021-10-27
https://git.kernel.org/stable/c/232ed9752510de4436468b653d145565669c8498	2021-10-27
https://git.kernel.org/stable/c/7623b1035ca2d17bde0f6a086ad6844a34648df1	2021-10-27
https://git.kernel.org/stable/c/d3a83576378b4c904f711598dde2c5e881c4295c	2021-10-27
https://git.kernel.org/stable/c/93be0eeea14cf39235e585c8f56df3b3859deaad	2021-10-27
https://git.kernel.org/stable/c/0e677ea5b7396f715a76b6b0ef441430e4c4b57f	2021-10-27
https://git.kernel.org/stable/c/b15fa9224e6e1239414525d8d556d824701849fc	2021-10-19

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.4.290 Search vendor "Linux" for product "Linux Kernel" and version " < 4.4.290"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.9.288 Search vendor "Linux" for product "Linux Kernel" and version " < 4.9.288"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.14.253 Search vendor "Linux" for product "Linux Kernel" and version " < 4.14.253"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.19.214 Search vendor "Linux" for product "Linux Kernel" and version " < 4.19.214"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.4.156 Search vendor "Linux" for product "Linux Kernel" and version " < 5.4.156"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.10.76 Search vendor "Linux" for product "Linux Kernel" and version " < 5.10.76"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.14.15 Search vendor "Linux" for product "Linux Kernel" and version " < 5.14.15"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.15 Search vendor "Linux" for product "Linux Kernel" and version " < 5.15"		en		Affected