CVE-2023-52434

2024-02-2000:00:00

ubuntu.com

linux kernel

smb client

oobs vulnerability fix

cve-2023-52434

8 High

CVSS3

Attack Vector

ADJACENT

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

6.3 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

5.1%

JSON

In the Linux kernel, the following vulnerability has been resolved: smb:
client: fix potential OOBs in smb2_parse_contexts() Validate offsets and
lengths before dereferencing create contexts in smb2_parse_contexts(). This
fixes following oops when accessing invalid create contexts from server:
BUG: unable to handle page fault for address: ffff8881178d8cc3 #PF:
supervisor read access in kernel mode #PF: error_code(0x0000) - not-present
page PGD 4a01067 P4D 4a01067 PUD 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 3
PID: 1736 Comm: mount.cifs Not tainted 6.7.0-rc4 #1 Hardware name: QEMU
Standard PC (Q35 + ICH9, 2009), BIOS
rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014 RIP:
0010:smb2_parse_contexts+0xa0/0x3a0 [cifs] Code: f8 10 75 13 48 b8 93 ad 25
50 9c b4 11 e7 49 39 06 0f 84 d2 00 00 00 8b 45 00 85 c0 74 61 41 29 c5 48
01 c5 41 83 fd 0f 76 55 <0f> b7 7d 04 0f b7 45 06 4c 8d 74 3d 00 66 83 f8
04 75 bc ba 04 00 RSP: 0018:ffffc900007939e0 EFLAGS: 00010216 RAX:
ffffc90000793c78 RBX: ffff8880180cc000 RCX: ffffc90000793c90 RDX:
ffffc90000793cc0 RSI: ffff8880178d8cc0 RDI: ffff8880180cc000 RBP:
ffff8881178d8cbf R08: ffffc90000793c22 R09: 0000000000000000 R10:
ffff8880180cc000 R11: 0000000000000024 R12: 0000000000000000 R13:
0000000000000020 R14: 0000000000000000 R15: ffffc90000793c22 FS:
00007f873753cbc0(0000) GS:ffff88806bc00000(0000) knlGS:0000000000000000 CS:
0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8881178d8cc3 CR3:
00000000181ca000 CR4: 0000000000750ef0 PKRU: 55555554 Call Trace: <TASK> ?
__die+0x23/0x70 ? page_fault_oops+0x181/0x480 ?
search_module_extables+0x19/0x60 ? srso_alias_return_thunk+0x5/0xfbef5 ?
exc_page_fault+0x1b6/0x1c0 ? asm_exc_page_fault+0x26/0x30 ?
smb2_parse_contexts+0xa0/0x3a0 [cifs] SMB2_open+0x38d/0x5f0 [cifs] ?
smb2_is_path_accessible+0x138/0x260 [cifs]
smb2_is_path_accessible+0x138/0x260 [cifs] cifs_is_path_remote+0x8d/0x230
[cifs] cifs_mount+0x7e/0x350 [cifs] cifs_smb3_do_mount+0x128/0x780 [cifs]
smb3_get_tree+0xd9/0x290 [cifs] vfs_get_tree+0x2c/0x100 ? capable+0x37/0x70
path_mount+0x2d7/0xb80 ? srso_alias_return_thunk+0x5/0xfbef5 ?
_raw_spin_unlock_irqrestore+0x44/0x60 __x64_sys_mount+0x11a/0x150
do_syscall_64+0x47/0xf0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP:
0033:0x7f8737657b1e

OSVersionArchitecturePackageVersionFilename
ubuntu20.04noarchlinux< anyUNKNOWN
ubuntu22.04noarchlinux< 5.15.0-112.122UNKNOWN
ubuntu23.10noarchlinux< 6.5.0-27.28UNKNOWN
ubuntu24.04noarchlinux< 6.8.0-7.7UNKNOWN
ubuntu20.04noarchlinux-aws< anyUNKNOWN
ubuntu22.04noarchlinux-aws< 5.15.0-1063.69UNKNOWN
ubuntu23.10noarchlinux-aws< 6.5.0-1017.17UNKNOWN
ubuntu24.04noarchlinux-aws< anyUNKNOWN
ubuntu20.04noarchlinux-aws-5.15< 5.15.0-1063.69~20.04.1UNKNOWN
ubuntu22.04noarchlinux-aws-6.5< 6.5.0-1017.17~22.04.2UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	20.04	noarch	linux	< any	UNKNOWN
ubuntu	22.04	noarch	linux	< 5.15.0-112.122	UNKNOWN
ubuntu	23.10	noarch	linux	< 6.5.0-27.28	UNKNOWN
ubuntu	24.04	noarch	linux	< 6.8.0-7.7	UNKNOWN
ubuntu	20.04	noarch	linux-aws	< any	UNKNOWN
ubuntu	22.04	noarch	linux-aws	< 5.15.0-1063.69	UNKNOWN
ubuntu	23.10	noarch	linux-aws	< 6.5.0-1017.17	UNKNOWN
ubuntu	24.04	noarch	linux-aws	< any	UNKNOWN
ubuntu	20.04	noarch	linux-aws-5.15	< 5.15.0-1063.69~20.04.1	UNKNOWN
ubuntu	22.04	noarch	linux-aws-6.5	< 6.5.0-1017.17~22.04.2	UNKNOWN