Описание
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix NULL ptr deref in crypto_aead_setkey()
Neither SMB3.0 or SMB3.02 supports encryption negotiate context, so
when SMB2_GLOBAL_CAP_ENCRYPTION flag is set in the negotiate response,
the client uses AES-128-CCM as the default cipher. See MS-SMB2
3.3.5.4.
Commit b0abcd65ec54 ("smb: client: fix UAF in async decryption") added
a @server->cipher_type check to conditionally call
smb3_crypto_aead_allocate(), but that check would always be false as
@server->cipher_type is unset for SMB3.02.
Fix the following KASAN splat by setting @server->cipher_type for
SMB3.02 as well.
mount.cifs //srv/share /mnt -o vers=3.02,seal,...
BUG: KASAN: null-ptr-deref in crypto_aead_setkey+0x2c/0x130
Read of size 8 at addr 0000000000000020 by task mount.cifs/1095
CPU: 1 UID: 0 PID: 1095 Comm: mount.cifs Not tainted 6.12.0 #1
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-3.fc41
04/01/2014
Call Trace:
dump_stack_lvl+0x5d/0x80
? crypto_aead_setkey+0x2c/0x130
kasan_report+0xda/0x110
? crypto_aead_setkey+0x2c/0x130
crypto_aead_setkey+0x2c/0x130
crypt_message+0x258/0xec0 [cifs]
? __asan_memset+0x23/0x50
? __pfx_crypt_message+0x10/0x10 [cifs]
? mark_lock+0xb0/0x6a0
? hlock_class+0x32/0xb0
? mark_lock+0xb0/0x6a0
smb3_init_transform_rq+0x352/0x3f0 [cifs]
? lock_acquire.part.0+0xf4/0x2a0
smb_send_rqst+0x144/0x230 [cifs]
? __pfx_smb_send_rqst+0x10/0x10 [cifs]
? hlock_class+0x32/0xb0
? smb2_setup_request+0x225/0x3a0 [cifs]
? __pfx_cifs_compound_last_callback+0x10/0x10 [cifs]
compound_send_recv+0x59b/0x1140 [cifs]
? __pfx_compound_send_recv+0x10/0x10 [cifs]
? __create_object+0x5e/0x90
? hlock_class+0x32/0xb0
? do_raw_spin_unlock+0x9a/0xf0
cifs_send_recv+0x23/0x30 [cifs]
SMB2_tcon+0x3ec/0xb30 [cifs]
? __pfx_SMB2_tcon+0x10/0x10 [cifs]
? lock_acquire.part.0+0xf4/0x2a0
? __pfx_lock_release+0x10/0x10
? do_raw_spin_trylock+0xc6/0x120
? lock_acquire+0x3f/0x90
? _get_xid+0x16/0xd0 [cifs]
? __pfx_SMB2_tcon+0x10/0x10 [cifs]
? cifs_get_smb_ses+0xcdd/0x10a0 [cifs]
cifs_get_smb_ses+0xcdd/0x10a0 [cifs]
? __pfx_cifs_get_smb_ses+0x10/0x10 [cifs]
? cifs_get_tcp_session+0xaa0/0xca0 [cifs]
cifs_mount_get_session+0x8a/0x210 [cifs]
dfs_mount_share+0x1b0/0x11d0 [cifs]
? __pfx___lock_acquire+0x10/0x10
? __pfx_dfs_mount_share+0x10/0x10 [cifs]
? lock_acquire.part.0+0xf4/0x2a0
? find_held_lock+0x8a/0xa0
? hlock_class+0x32/0xb0
? lock_release+0x203/0x5d0
cifs_mount+0xb3/0x3d0 [cifs]
? do_raw_spin_trylock+0xc6/0x120
? __pfx_cifs_mount+0x10/0x10 [cifs]
? lock_acquire+0x3f/0x90
? find_nls+0x16/0xa0
? smb3_update_mnt_flags+0x372/0x3b0 [cifs]
cifs_smb3_do_mount+0x1e2/0xc80 [cifs]
? __pfx_vfs_parse_fs_string+0x10/0x10
? __pfx_cifs_smb3_do_mount+0x10/0x10 [cifs]
smb3_get_tree+0x1bf/0x330 [cifs]
vfs_get_tree+0x4a/0x160
path_mount+0x3c1/0xfb0
? kasan_quarantine_put+0xc7/0x1d0
? __pfx_path_mount+0x10/0x10
? kmem_cache_free+0x118/0x3e0
? user_path_at+0x74/0xa0
__x64_sys_mount+0x1a6/0x1e0
? __pfx___x64_sys_mount+0x10/0x10
? mark_held_locks+0x1a/0x90
do_syscall_64+0xbb/0x1d0
entry_SYSCALL_64_after_hwframe+0x77/0x7f
A flaw was found in the Linux kernel's SMB (Server Message Block) client. When mounting a share with encryption enabled under specific protocol options, the client fails to properly initialize the cipher type, leaving cryptographic structures unallocated. An authorized local user can exploit this vulnerability to trigger a NULL pointer dereference during encryption setup, resulting in a system crash and Denial of Service (DoS).
Меры по смягчению последствий
To mitigate this issue, avoid mounting SMB network shares using SMB version 3.02 with encryption enabled (for example, by omitting the 'seal' mount option or by selecting a newer protocol dialect such as 'vers=3.1.1'). Alternatively, if SMB/CIFS file shares are not required in the environment, prevent the CIFS kernel module from loading:
- Blacklist the module configuration:
echo "install cifs /bin/true" > /etc/modprobe.d/disable-cifs.conf
- Unload the module if not currently in use:
modprobe -r cifs
Caveats: Disabling the CIFS kernel module will prevent the system from accessing all SMB and CIFS remote shares. If the module is currently loaded into the running kernel or used by active mounts, a system restart is required for the change to take effect.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Not affected | ||
| Red Hat Enterprise Linux 6 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | ||
| Red Hat Enterprise Linux 8 | kernel | Not affected | ||
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | ||
| Red Hat Enterprise Linux 9 | kernel | Affected |
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Дополнительная информация
Статус:
5.5 Medium
CVSS3
Связанные уязвимости
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix NULL ptr deref in crypto_aead_setkey() Neither SMB3.0 or SMB3.02 supports encryption negotiate context, so when SMB2_GLOBAL_CAP_ENCRYPTION flag is set in the negotiate response, the client uses AES-128-CCM as the default cipher. See MS-SMB2 3.3.5.4. Commit b0abcd65ec54 ("smb: client: fix UAF in async decryption") added a @server->cipher_type check to conditionally call smb3_crypto_aead_allocate(), but that check would always be false as @server->cipher_type is unset for SMB3.02. Fix the following KASAN splat by setting @server->cipher_type for SMB3.02 as well. mount.cifs //srv/share /mnt -o vers=3.02,seal,... BUG: KASAN: null-ptr-deref in crypto_aead_setkey+0x2c/0x130 Read of size 8 at addr 0000000000000020 by task mount.cifs/1095 CPU: 1 UID: 0 PID: 1095 Comm: mount.cifs Not tainted 6.12.0 #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-3.fc41 04/01/2014 Call Trace: <TASK> dump_s...
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix NULL ptr deref in crypto_aead_setkey() Neither SMB3.0 or SMB3.02 supports encryption negotiate context, so when SMB2_GLOBAL_CAP_ENCRYPTION flag is set in the negotiate response, the client uses AES-128-CCM as the default cipher. See MS-SMB2 3.3.5.4. Commit b0abcd65ec54 ("smb: client: fix UAF in async decryption") added a @server->cipher_type check to conditionally call smb3_crypto_aead_allocate(), but that check would always be false as @server->cipher_type is unset for SMB3.02. Fix the following KASAN splat by setting @server->cipher_type for SMB3.02 as well. mount.cifs //srv/share /mnt -o vers=3.02,seal,... BUG: KASAN: null-ptr-deref in crypto_aead_setkey+0x2c/0x130 Read of size 8 at addr 0000000000000020 by task mount.cifs/1095 CPU: 1 UID: 0 PID: 1095 Comm: mount.cifs Not tainted 6.12.0 #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-3.fc41 04/01/2014 Call Trace: <TASK> d
smb: client: fix NULL ptr deref in crypto_aead_setkey()
In the Linux kernel, the following vulnerability has been resolved: s ...
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix NULL ptr deref in crypto_aead_setkey() Neither SMB3.0 or SMB3.02 supports encryption negotiate context, so when SMB2_GLOBAL_CAP_ENCRYPTION flag is set in the negotiate response, the client uses AES-128-CCM as the default cipher. See MS-SMB2 3.3.5.4. Commit b0abcd65ec54 ("smb: client: fix UAF in async decryption") added a @server->cipher_type check to conditionally call smb3_crypto_aead_allocate(), but that check would always be false as @server->cipher_type is unset for SMB3.02. Fix the following KASAN splat by setting @server->cipher_type for SMB3.02 as well. mount.cifs //srv/share /mnt -o vers=3.02,seal,... BUG: KASAN: null-ptr-deref in crypto_aead_setkey+0x2c/0x130 Read of size 8 at addr 0000000000000020 by task mount.cifs/1095 CPU: 1 UID: 0 PID: 1095 Comm: mount.cifs Not tainted 6.12.0 #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-3.fc41 04/01/2014 Call Trace: <TASK>...
5.5 Medium
CVSS3