CVE-2024-26608

ksmbd: fix global oob in ksmbd_nl_policy

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track*

*SSVC

Descriptions

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix global oob in ksmbd_nl_policy

Similar to a reported issue (check the commit b33fb5b801c6 ("net:
qualcomm: rmnet: fix global oob in rmnet_policy"), my local fuzzer finds
another global out-of-bounds read for policy ksmbd_nl_policy. See bug
trace below:

==================================================================
BUG: KASAN: global-out-of-bounds in validate_nla lib/nlattr.c:386 [inline]
BUG: KASAN: global-out-of-bounds in __nla_validate_parse+0x24af/0x2750 lib/nlattr.c:600
Read of size 1 at addr ffffffff8f24b100 by task syz-executor.1/62810

CPU: 0 PID: 62810 Comm: syz-executor.1 Tainted: G N 6.1.0 #3
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x172/0x475 mm/kasan/report.c:395
kasan_report+0xbb/0x1c0 mm/kasan/report.c:495
validate_nla lib/nlattr.c:386 [inline]
__nla_validate_parse+0x24af/0x2750 lib/nlattr.c:600
__nla_parse+0x3e/0x50 lib/nlattr.c:697
__nlmsg_parse include/net/netlink.h:748 [inline]
genl_family_rcv_msg_attrs_parse.constprop.0+0x1b0/0x290 net/netlink/genetlink.c:565
genl_family_rcv_msg_doit+0xda/0x330 net/netlink/genetlink.c:734
genl_family_rcv_msg net/netlink/genetlink.c:833 [inline]
genl_rcv_msg+0x441/0x780 net/netlink/genetlink.c:850
netlink_rcv_skb+0x14f/0x410 net/netlink/af_netlink.c:2540
genl_rcv+0x24/0x40 net/netlink/genetlink.c:861
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x54e/0x800 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x930/0xe50 net/netlink/af_netlink.c:1921
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0x154/0x190 net/socket.c:734
____sys_sendmsg+0x6df/0x840 net/socket.c:2482
___sys_sendmsg+0x110/0x1b0 net/socket.c:2536
__sys_sendmsg+0xf3/0x1c0 net/socket.c:2565
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fdd66a8f359
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdd65e00168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fdd66bbcf80 RCX: 00007fdd66a8f359
RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000003
RBP: 00007fdd66ada493 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc84b81aff R14: 00007fdd65e00300 R15: 0000000000022000
</TASK>

The buggy address belongs to the variable:
ksmbd_nl_policy+0x100/0xa80

The buggy address belongs to the physical page:
page:0000000034f47940 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1ccc4b
flags: 0x200000000001000(reserved|node=0|zone=2)
raw: 0200000000001000 ffffea00073312c8 ffffea00073312c8 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffffffff8f24b000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffffffff8f24b080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffffff8f24b100: f9 f9 f9 f9 00 00 f9 f9 f9 f9 f9 f9 00 00 07 f9
^
ffffffff8f24b180: f9 f9 f9 f9 00 05 f9 f9 f9 f9 f9 f9 00 00 00 05
ffffffff8f24b200: f9 f9 f9 f9 00 00 03 f9 f9 f9 f9 f9 00 00 04 f9
==================================================================

To fix it, add a placeholder named __KSMBD_EVENT_MAX and let
KSMBD_EVENT_MAX to be its original value - 1 according to what other
netlink families do. Also change two sites that refer the
KSMBD_EVENT_MAX to correct value.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: ksmbd: corrige el oob global en ksmbd_nl_policy Similar a un problema reportado (verifique el commit b33fb5b801c6 ("net: qualcomm: rmnet: corrige el oob global en rmnet_policy"), mi fuzzer local encuentra otra Lectura global fuera de los límites para la política ksmbd_nl_policy. Consulte el seguimiento del error a continuación: ==================================== ================================ ERROR: KASAN: global fuera de los límites en validar_nla lib/nlattr.c :386 [en línea] ERROR: KASAN: global fuera de los límites en __nla_validate_parse+0x24af/0x2750 lib/nlattr.c:600 Lectura de tamaño 1 en addr ffffffff8f24b100 por tarea syz-executor.1/62810 CPU: 0 PID: 62810 Comm: syz-executor.1 Contaminado: GN 6.1.0 #3 Nombre del hardware: PC estándar QEMU (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 01/04/2014 Seguimiento de llamadas: __dump_stack lib/dump_stack.c:88 [en línea] dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [en línea] print_report+0x172/0x475 mm/kasan/report.c:395 kasan_report +0xbb/0x1c0 mm/kasan/report.c:495 validar_nla lib/nlattr.c:386 [en línea] __nla_validate_parse+0x24af/0x2750 lib/nlattr.c:600 __nla_parse+0x3e/0x50 lib/nlattr.c:697 __nlmsg_parse incluir /net/netlink.h:748 [en línea] genl_family_rcv_msg_attrs_parse.constprop.0+0x1b0/0x290 net/netlink/genetlink.c:565 genl_family_rcv_msg_doit+0xda/0x330 net/netlink/genetlink.c:734 genl_family_rcv_msg net/netlink/genetlink. c:833 [en línea] genl_rcv_msg+0x441/0x780 net/netlink/genetlink.c:850 netlink_rcv_skb+0x14f/0x410 net/netlink/af_netlink.c:2540 genl_rcv+0x24/0x40 net/netlink/genetlink.c:861 netlink_unicast_kernel net /netlink/af_netlink.c:1319 [en línea] netlink_unicast+0x54e/0x800 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x930/0xe50 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [en línea] sock_sendmsg+0x154/0x190 net/socket.c:734 ____sys_sendmsg+0x6df/0x840 net/socket.c:2482 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536 __sys_sendmsg+0xf3/0x1c0 net/socket. c:2565 do_syscall_x64 arco /x86/entry/common.c:50 [en línea] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 Entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fdd66a8f359 Código: 28 00 00 00 75 05 48 8 3 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff f ff f7 d8 64 89 01 48 RSP: 002b:00007fdd65e00168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fdd66bbcf80 RCX: 00007fdd66a8 f359 RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000003 RBP: 00007fdd66ada493 R08: 00000000000000000 R09: 00000000000000000 R 10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc84b81aff R14: 00007fdd65e00300 R15: 0000000000022000 La dirección del error pertenece a la variable: ksmbd_nl_policy+0x 100/0xa80 La dirección del error pertenece a la página física: página:0000000034f47940 refcount:1 mapcount:0 mapeo: 0000000000000000 índice: 0x0 pfn: 0x1ccc4b banderas: 0x200000000001000 (reservado | nodo = 0 | zona = 2) sin formato: 02000000000001000 ffffea00073312c8 ffffea00073312c8 000000000 0000000 raw: 0000000000000000 00000000000000000 00000001ffffffff 0000000000000000 página volcada porque: kasan: mal acceso detectado Estado de la memoria alrededor de la dirección con errores: ffffffff8f24b000 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffff8f24b080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffffff8f24b100 : f9 f9 f9 f9 00 00 f9 f9 f9 f9 f9 f9 00 00 07 f9 ^ ffffffff8f24b180: f9 f9 f9 f9 00 05 f9 f9 f9 f9 f9 f9 00 00 00 05 ffffffff8f24b200: f9 f9 f9 f9 00 00 03 f9 f9 f9 f9 f9 00 00 04 f9 ======== = ==================================================== ======= Para solucionarlo, agregue un marcador de posición llamado __KSMBD_EVENT_MAX y truncado

*Credits: N/A

CVSS Scores

CISAv3.1 7.8

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:Track*

Exploitation

None

Automatable

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2024-02-19 CVE Reserved
2024-02-29 CVE Published
2024-03-01 EPSS Updated
2024-12-19 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-125: Out-of-bounds Read

CAPEC

References (6)

URL	Tag	Source
https://git.kernel.org/stable/c/0626e6641f6b467447c81dd7678a69c66f7746cf	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/aaa1f1a2ee80888c12ae2783f3a0be10e14067c5	2024-02-23
https://git.kernel.org/stable/c/2c939c74ef0b74e99b92e32edc2a59f9b9ca3d5a	2024-02-01
https://git.kernel.org/stable/c/9863a53100f47652755545c2bd43e14a1855104d	2024-02-01
https://git.kernel.org/stable/c/6993328a4cd62a24df254b587c0796a4a1eecc95	2024-02-01
https://git.kernel.org/stable/c/ebeae8adf89d9a82359f6659b1663d09beec2faa	2024-01-25

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.15 < 5.15.149 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 5.15.149"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.15 < 6.1.76 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 6.1.76"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.15 < 6.6.15 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 6.6.15"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.15 < 6.7.3 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 6.7.3"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.15 < 6.8 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 6.8"		en		Affected