CVE-2023-52434: smb: client: fix potential OOBs in smb2_parse_contexts()
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix potential OOBs in smb2parsecontexts()
Validate offsets and lengths before dereferencing create contexts in smb2parsecontexts().
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: errorcode(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:smb2parsecontexts+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: ? die+0x23/0x70 ? pagefaultoops+0x181/0x480 ? searchmoduleextables+0x19/0x60 ? srsoaliasreturnthunk+0x5/0xfbef5 ? excpagefault+0x1b6/0x1c0 ? asmexcpagefault+0x26/0x30 ? smb2parsecontexts+0xa0/0x3a0 [cifs] SMB2open+0x38d/0x5f0 [cifs] ? smb2ispathaccessible+0x138/0x260 [cifs] smb2ispathaccessible+0x138/0x260 [cifs] cifsispathremote+0x8d/0x230 [cifs] cifsmount+0x7e/0x350 [cifs] cifssmb3domount+0x128/0x780 [cifs] smb3gettree+0xd9/0x290 [cifs] vfsgettree+0x2c/0x100 ? capable+0x37/0x70 pathmount+0x2d7/0xb80 ? srsoaliasreturnthunk+0x5/0xfbef5 ? rawspinunlockirqrestore+0x44/0x60 x64sysmount+0x11a/0x150 dosyscall64+0x47/0xf0 entrySYSCALL64afterhwframe+0x6f/0x77 RIP: 0033:0x7f8737657b1e
Other sources
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix potential OOBs in smb2parsecontexts()
Validate offsets and lengths before dereferencing create contexts in smb2parsecontexts().
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: errorcode(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:smb2parsecontexts+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 ? pagefaultoops+0x181/0x480 ? searchmoduleextables+0x19/0x60 ? srsoaliasreturnthunk+0x5/0xfbef5 ? excpagefault+0x1b6/0x1c0 ? asmexcpagefault+0x26/0x30 ? smb2parsecontexts+0xa0/0x3a0 [cifs] SMB2open+0x38d/0x5f0 [cifs] ? smb2ispathaccessible+0x138/0x260 [cifs] smb2ispathaccessible+0x138/0x260 [cifs] cifsispathremote+0x8d/0x230 [cifs] cifsmount+0x7e/0x350 [cifs] cifssmb3domount+0x128/0x780 [cifs] smb3gettree+0xd9/0x290 [cifs] vfsgettree+0x2c/0x100 ? capable+0x37/0x70 pathmount+0x2d7/0xb80 ? srsoaliasreturnthunk+0x5/0xfbef5 ? rawspinunlockirqrestore+0x44/0x60 x64sysmount+0x11a/0x150 dosyscall64+0x47/0xf0 entrySYSCALL64afterhwframe+0x6f/0x77 RIP: 0033:0x7f8737657b1e
— NVD
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2023-52434?
CVE-2023-52434 has been classified as a moderate severity vulnerability due to potential out-of-bounds access affecting the Linux kernel.
How do I fix CVE-2023-52434?
To fix CVE-2023-52434, update your Linux kernel to a version that includes the patch for this vulnerability, specifically versions like 5.10.223-1, 6.1.123-1, or newer.
Which versions of the Linux kernel are affected by CVE-2023-52434?
CVE-2023-52434 affects multiple versions of the Linux kernel from 5.3 up to, but not including, versions that contain the patch for this vulnerability.
What impact does CVE-2023-52434 have on systems running affected kernel versions?
The impact of CVE-2023-52434 includes potential system crashes or instability due to out-of-bounds access when invalid create contexts are accessed.
Who is responsible for addressing CVE-2023-52434?
It is the responsibility of system administrators and users of affected Linux distributions to ensure their systems are updated to mitigate CVE-2023-52434.