In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: fix LED ID check in led_tg_check() Syzbot has reported the following BUG detected by KASAN: BUG: KASAN: slab-out-of-bounds in strlen+0x58/0x70 Read of size 1 at addr ffff8881022da0c8 by task repro/5879 ... Call Trace: <TASK> dump_stack_lvl+0x241/0x360 ? __pfx_dump_stack_lvl+0x10/0x10 ? __pfx__printk+0x10/0x10 ? _printk+0xd5/0x120 ? __virt_addr_valid+0x183/0x530 ? __virt_addr_valid+0x183/0x530 print_report+0x169/0x550 ? __virt_addr_valid+0x183/0x530 ? __virt_addr_valid+0x183/0x530 ? __virt_addr_valid+0x45f/0x530 ? __phys_addr+0xba/0x170 ? strlen+0x58/0x70 kasan_report+0x143/0x180 ? strlen+0x58/0x70 strlen+0x58/0x70 kstrdup+0x20/0x80 led_tg_check+0x18b/0x3c0 xt_check_target+0x3bb/0xa40 ? __pfx_xt_check_target+0x10/0x10 ? stack_depot_save_flags+0x6e4/0x830 ? nft_target_init+0x174/0xc30 nft_target_init+0x82d/0xc30 ? __pfx_nft_target_init+0x10/0x10 ? nf_tables_newrule+0x1609/0x2980 ? nf_tables_newrule+0x1609/0x2980 ? rcu_is_watching+0x15/0xb0 ? nf_tables_newrule+0x1609/0x2980 ? nf_tables_newrule+0x1609/0x2980 ? __kmalloc_noprof+0x21a/0x400 nf_tables_newrule+0x1860/0x2980 ? __pfx_nf_tables_newrule+0x10/0x10 ? __nla_parse+0x40/0x60 nfnetlink_rcv+0x14e5/0x2ab0 ? __pfx_validate_chain+0x10/0x10 ? __pfx_nfnetlink_rcv+0x10/0x10 ? __lock_acquire+0x1384/0x2050 ? netlink_deliver_tap+0x2e/0x1b0 ? __pfx_lock_release+0x10/0x10 ? netlink_deliver_tap+0x2e/0x1b0 netlink_unicast+0x7f8/0x990 ? __pfx_netlink_unicast+0x10/0x10 ? __virt_addr_valid+0x183/0x530 ? __check_object_size+0x48e/0x900 netlink_sendmsg+0x8e4/0xcb0 ? __pfx_netlink_sendmsg+0x10/0x10 ? aa_sock_msg_perm+0x91/0x160 ? __pfx_netlink_sendmsg+0x10/0x10 __sock_sendmsg+0x223/0x270 ____sys_sendmsg+0x52a/0x7e0 ? __pfx_____sys_sendmsg+0x10/0x10 __sys_sendmsg+0x292/0x380 ? __pfx___sys_sendmsg+0x10/0x10 ? lockdep_hardirqs_on_prepare+0x43d/0x780 ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 ? exc_page_fault+0x590/0x8c0 ? do_syscall_64+0xb6/0x230 do_syscall_64+0xf3/0x230 entry_SYSCALL_64_after_hwframe+0x77/0x7f ... </TASK> Since an invalid (without '\0' byte at all) byte sequence may be passed from userspace, add an extra check to ensure that such a sequence is rejected as possible ID and so never passed to 'kstrdup()' and further.
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: x_tables: corrección de la comprobación del ID del LED en led_tg_check() Syzbot ha informado del siguiente ERROR detectado por KASAN: ERROR: KASAN: slab-out-of-bounds en strlen+0x58/0x70 Lectura de tamaño 1 en la dirección ffff8881022da0c8 por la tarea repro/5879 ... Seguimiento de llamadas: dump_stack_lvl+0x241/0x360 ? __pfx_dump_stack_lvl+0x10/0x10 ? __pfx__printk+0x10/0x10 ? _printk+0xd5/0x120 ? __virt_addr_valid+0x183/0x530 ? __virt_addr_valid+0x183/0x530 imprimir_informe+0x169/0x550 ? __virt_addr_valid+0x183/0x530 ? __virt_addr_valid+0x183/0x530 ? __virt_addr_valid+0x45f/0x530 ? __phys_addr+0xba/0x170 ? strlen+0x58/0x70 kasan_informe+0x143/0x180 ? strlen+0x58/0x70 strlen+0x58/0x70 kstrdup+0x20/0x80 led_tg_check+0x18b/0x3c0 xt_check_target+0x3bb/0xa40 ? __pfx_xt_check_target+0x10/0x10 ? stack_depot_save_flags+0x6e4/0x830 ? nft_target_init+0x174/0xc30 nft_target_init+0x82d/0xc30 ? __pfx_nft_target_init+0x10/0x10 ? nf_tables_newrule+0x1609/0x2980 ? nf_tables_newrule+0x1609/0x2980 ? rcu_is_watching+0x15/0xb0 ? nf_tables_newrule+0x1609/0x2980 ? nf_tables_newrule+0x1609/0x2980 ? __kmalloc_noprof+0x21a/0x400 nf_tables_newrule+0x1860/0x2980 ? __pfx_nf_tables_newrule+0x10/0x10 ? __nla_parse+0x40/0x60 nfnetlink_rcv+0x14e5/0x2ab0 ? __pfx_validate_chain+0x10/0x10 ? __pfx_nfnetlink_rcv+0x10/0x10 ? __lock_acquire+0x1384/0x2050 ? netlink_deliver_tap+0x2e/0x1b0 ? __pfx_lock_release+0x10/0x10 ? aa_sock_msg_perm+0x91/0x160 ? __pfx_netlink_sendmsg+0x10/0x10 __sock_sendmsg+0x223/0x270 ____sys_sendmsg+0x52a/0x7e0 ? exc_page_fault+0x590/0x8c0 ? Dado que una secuencia de bytes no válida (sin el byte '\0' en absoluto) puede pasarse desde el espacio de usuario, agregue una verificación adicional para garantizar que dicha secuencia se rechace como posible ID y, por lo tanto, nunca se pase a 'kstrdup()' ni a nada más.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
| Attack Vector | LOCAL |
|---|---|
| Attack Complexity | LOW |
| Privileges Required | LOW |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | HIGH |
| Integrity Impact | NONE |
| Availability Impact | HIGH |
| Source | Type | Description |
|---|---|---|
| [email protected] | Primary |
en
CWE-125
|
| 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary |
en
CWE-125
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd3845fe540> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd340af6300> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd36b86d5c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd36b86d080> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd3845fc280> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd3845fda80> | Operating System |
| linux | linux_kernel | 6.13 | <built-in method update of dict object at 0x7fd39c4e8040> | Operating System |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:* |