CVE-2024-50110

xfrm: fix one more kernel-infoleak in algo dumping

Severity Score

"-"

*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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

xfrm: fix one more kernel-infoleak in algo dumping

During fuzz testing, the following issue was discovered:

BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x598/0x2a30
_copy_to_iter+0x598/0x2a30
__skb_datagram_iter+0x168/0x1060
skb_copy_datagram_iter+0x5b/0x220
netlink_recvmsg+0x362/0x1700
sock_recvmsg+0x2dc/0x390
__sys_recvfrom+0x381/0x6d0
__x64_sys_recvfrom+0x130/0x200
x64_sys_call+0x32c8/0x3cc0
do_syscall_64+0xd8/0x1c0
entry_SYSCALL_64_after_hwframe+0x79/0x81

Uninit was stored to memory at:
copy_to_user_state_extra+0xcc1/0x1e00
dump_one_state+0x28c/0x5f0
xfrm_state_walk+0x548/0x11e0
xfrm_dump_sa+0x1e0/0x840
netlink_dump+0x943/0x1c40
__netlink_dump_start+0x746/0xdb0
xfrm_user_rcv_msg+0x429/0xc00
netlink_rcv_skb+0x613/0x780
xfrm_netlink_rcv+0x77/0xc0
netlink_unicast+0xe90/0x1280
netlink_sendmsg+0x126d/0x1490
__sock_sendmsg+0x332/0x3d0
____sys_sendmsg+0x863/0xc30
___sys_sendmsg+0x285/0x3e0
__x64_sys_sendmsg+0x2d6/0x560
x64_sys_call+0x1316/0x3cc0
do_syscall_64+0xd8/0x1c0
entry_SYSCALL_64_after_hwframe+0x79/0x81

Uninit was created at:
__kmalloc+0x571/0xd30
attach_auth+0x106/0x3e0
xfrm_add_sa+0x2aa0/0x4230
xfrm_user_rcv_msg+0x832/0xc00
netlink_rcv_skb+0x613/0x780
xfrm_netlink_rcv+0x77/0xc0
netlink_unicast+0xe90/0x1280
netlink_sendmsg+0x126d/0x1490
__sock_sendmsg+0x332/0x3d0
____sys_sendmsg+0x863/0xc30
___sys_sendmsg+0x285/0x3e0
__x64_sys_sendmsg+0x2d6/0x560
x64_sys_call+0x1316/0x3cc0
do_syscall_64+0xd8/0x1c0
entry_SYSCALL_64_after_hwframe+0x79/0x81

Bytes 328-379 of 732 are uninitialized
Memory access of size 732 starts at ffff88800e18e000
Data copied to user address 00007ff30f48aff0

CPU: 2 PID: 18167 Comm: syz-executor.0 Not tainted 6.8.11 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014

Fixes copying of xfrm algorithms where some random
data of the structure fields can end up in userspace.
Padding in structures may be filled with random (possibly sensitve)
data and should never be given directly to user-space.

A similar issue was resolved in the commit
8222d5910dae ("xfrm: Zero padding when dumping algos and encap")

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: xfrm: corrige una fuga de información del kernel más en el volcado de algoritmos. Durante las pruebas fuzz, se descubrió el siguiente problema: ERROR: KMSAN: fuga de información del kernel en _copy_to_iter+0x598/0x2a30 _copy_to_iter+0x598/0x2a30 __skb_datagram_iter+0x168/0x1060 skb_copy_datagram_iter+0x5b/0x220 netlink_recvmsg+0x362/0x1700 sock_recvmsg+0x2dc/0x390 __sys_recvfrom+0x381/0x6d0 __x64_sys_recvfrom+0x130/0x200 x64_sys_call+0x32c8/0x3cc0 do_syscall_64+0xd8/0x1c0 entry_SYSCALL_64_after_hwframe+0x79/0x81 Ununit se almacenó en la memoria en: copy_to_user_state_extra+0xcc1/0x1e00 dump_one_state+0x28c/0x5f0 xfrm_state_walk+0x548/0x11e0 xfrm_dump_sa+0x1e0/0x840 netlink_dump+0x943/0x1c40 __netlink_dump_start+0x746/0xdb0 xfrm_user_rcv_msg+0x429/0xc00 netlink_rcv_skb+0x613/0x780 xfrm_netlink_rcv+0x77/0xc0 netlink_unicast+0xe90/0x1280 netlink_sendmsg+0x126d/0x1490 __sock_sendmsg+0x332/0x3d0 ____sys_sendmsg+0x863/0xc30 ___sys_sendmsg+0x285/0x3e0 __x64_sys_sendmsg+0x2d6/0x560 x64_sys_call+0x1316/0x3cc0 do_syscall_64+0xd8/0x1c0 entry_SYSCALL_64_after_hwframe+0x79/0x81 Uninit se creó en: __kmalloc+0x571/0xd30 attached_auth+0x106/0x3e0 xfrm_add_sa+0x2aa0/0x4230 xfrm_user_rcv_msg+0x832/0xc00 netlink_rcv_skb+0x613/0x780 xfrm_netlink_rcv+0x77/0xc0 netlink_unicast+0xe90/0x1280 netlink_sendmsg+0x126d/0x1490 __sock_sendmsg+0x332/0x3d0 ____sys_sendmsg+0x863/0xc30 ___sys_sendmsg+0x285/0x3e0 __x64_sys_sendmsg+0x2d6/0x560 x64_sys_call+0x1316/0x3cc0 do_syscall_64+0xd8/0x1c0 entry_SYSCALL_64_after_hwframe+0x79/0x81 Los bytes 328-379 de 732 no están inicializados El acceso a la memoria de tamaño 732 comienza en ffff88800e18e000 Datos copiados a la dirección de usuario 00007ff30f48aff0 CPU: 2 PID: 18167 Comm: syz-executor.0 No contaminado 6.8.11 #1 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Corrige la copia de algoritmos xfrm donde algunos datos aleatorios de los campos de estructura pueden terminar en el espacio de usuario. El relleno en las estructuras se puede rellenar con datos aleatorios (posiblemente confidenciales) y nunca se debe proporcionar directamente al espacio de usuario. Un problema similar se resolvió en la confirmación 8222d5910dae ("xfrm: relleno de ceros al volcar algoritmos y encap") encontrado por Linux Verification Center (linuxtesting.org) con Syzkaller.

*Credits: N/A

CVSS Scores

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2024-10-21 CVE Reserved
2024-11-05 CVE Published
2024-11-06 EPSS Updated
2024-11-19 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (6)

URL	Tag	Source
https://git.kernel.org/stable/c/c7a5899eb26e2a4d516d53f65b6dd67be2228041	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/610d4cea9b442b22b4820695fc3335e64849725e	2024-11-01
https://git.kernel.org/stable/c/dc2ad8e8818e4bf1a93db78d81745b4877b32972	2024-11-01
https://git.kernel.org/stable/c/c73bca72b84b453c8d26a5e7673b20adb294bf54	2024-11-01
https://git.kernel.org/stable/c/1e8fbd2441cb2ea28d6825f2985bf7d84af060bb	2024-11-01
https://git.kernel.org/stable/c/6889cd2a93e1e3606b3f6e958aa0924e836de4d2	2024-10-11

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"				>= 5.11 < 5.15.170 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.11 < 5.15.170"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.11 < 6.1.115 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.11 < 6.1.115"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.11 < 6.6.59 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.11 < 6.6.59"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.11 < 6.11.6 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.11 < 6.11.6"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.11 < 6.12 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.11 < 6.12"		en		Affected