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CVE-2023-52434— smb: client: fix potential OOBs in smb2_parse_contexts()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于smb中存在越界访问漏洞。

CVSS 8.1 · High EPSS 1.02% · P62

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux b8c32dbb0deb287a5fcb78251e4eae6c7275760d< 6726429c18c62dbf5e96ebbd522f262e016553fb affected
b8c32dbb0deb287a5fcb78251e4eae6c7275760d< 13fb0fc4917621f3dfa285a27eaf7151d770b5e5 affected
b8c32dbb0deb287a5fcb78251e4eae6c7275760d< 890bc4fac3c0973a49cac35f634579bebba7fe48 affected
b8c32dbb0deb287a5fcb78251e4eae6c7275760d< 1ae3c59355dc9882e09c020afe8ffbd895ad0f29 affected
b8c32dbb0deb287a5fcb78251e4eae6c7275760d< 17a0f64cc02d4972e21c733d9f21d1c512963afa affected
b8c32dbb0deb287a5fcb78251e4eae6c7275760d< af1689a9b7701d9907dfc84d2a4b57c4bc907144 affected
3.7 affected
< 3.7 unaffected
… +6 more rows
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I. Basic Information for CVE-2023-52434

Vulnerability Information
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Vulnerability Title
smb: client: fix potential OOBs in smb2_parse_contexts()
Source: CVE Program / CVE List V5
Vulnerability Description
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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于smb中存在越界访问漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux b8c32dbb0deb287a5fcb78251e4eae6c7275760d ~ 6726429c18c62dbf5e96ebbd522f262e016553fb -
Linux Linux 3.7 -

II. Public POCs for CVE-2023-52434

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III. Intelligence Information for CVE-2023-52434

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Mailing List Discussions for CVE-2023-52434 (1)

Other References for CVE-2023-52434 (4)

Same Patch Batch · Linux · 2024-02-20 · 7 CVEs total

CVE-2023-52433 7.8 HIGH netfilter: nft_set_rbtree: skip sync GC for new elements in this transaction
CVE-2024-26581 7.8 HIGH netfilter: nft_set_rbtree: skip end interval element from gc
CVE-2023-52436 7.8 HIGH f2fs: explicitly null-terminate the xattr list
CVE-2023-52438 7.8 HIGH binder: fix use-after-free in shinker's callback
CVE-2023-52439 7.8 HIGH uio: Fix use-after-free in uio_open
CVE-2023-52435 net: prevent mss overflow in skb_segment()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-52434

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