| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2023-52434: smb: client: fix potential OOBs in smb2_parse_contexts() |
| |
| 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 |
| |
| The Linux kernel CVE team has assigned CVE-2023-52434 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.4.277 with commit 6726429c18c62dbf5e96ebbd522f262e016553fb |
| Fixed in 5.10.211 with commit 13fb0fc4917621f3dfa285a27eaf7151d770b5e5 |
| Fixed in 5.15.150 with commit 890bc4fac3c0973a49cac35f634579bebba7fe48 |
| Fixed in 6.1.79 with commit 1ae3c59355dc9882e09c020afe8ffbd895ad0f29 |
| Fixed in 6.6.8 with commit 17a0f64cc02d4972e21c733d9f21d1c512963afa |
| Fixed in 6.7 with commit af1689a9b7701d9907dfc84d2a4b57c4bc907144 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2023-52434 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| fs/smb/client/cached_dir.c |
| fs/smb/client/smb2pdu.c |
| fs/smb/client/smb2proto.h |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/6726429c18c62dbf5e96ebbd522f262e016553fb |
| https://git.kernel.org/stable/c/13fb0fc4917621f3dfa285a27eaf7151d770b5e5 |
| https://git.kernel.org/stable/c/890bc4fac3c0973a49cac35f634579bebba7fe48 |
| https://git.kernel.org/stable/c/1ae3c59355dc9882e09c020afe8ffbd895ad0f29 |
| https://git.kernel.org/stable/c/17a0f64cc02d4972e21c733d9f21d1c512963afa |
| https://git.kernel.org/stable/c/af1689a9b7701d9907dfc84d2a4b57c4bc907144 |
