In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: Add protection for bmp length out of range UBSAN load reports an exception of BRK#5515 SHIFT_ISSUE:Bitwise shifts that are out of bounds for their data type. vmlinux get_bitmap(b=75) + 712 <net/netfilter/nf_conntrack_h323_asn1.c:0> vmlinux decode_seq(bs=0xFFFFFFD008037000, f=0xFFFFFFD008037018, level=134443100) + 1956 <net/netfilter/nf_conntrack_h323_asn1.c:592> vmlinux decode_choice(base=0xFFFFFFD0080370F0, level=23843636) + 1216 <net/netfilter/nf_conntrack_h323_asn1.c:814> vmlinux decode_seq(f=0xFFFFFFD0080371A8, level=134443500) + 812 <net/netfilter/nf_conntrack_h323_asn1.c:576> vmlinux decode_choice(base=0xFFFFFFD008037280, level=0) + 1216 <net/netfilter/nf_conntrack_h323_asn1.c:814> vmlinux DecodeRasMessage() + 304 <net/netfilter/nf_conntrack_h323_asn1.c:833> vmlinux ras_help() + 684 <net/netfilter/nf_conntrack_h323_main.c:1728> vmlinux nf_confirm() + 188 <net/netfilter/nf_conntrack_proto.c:137> Due to abnormal data in skb->data, the extension bitmap length exceeds 32 when decoding ras message then uses the length to make a shift operation. It will change into negative after several loop. UBSAN load could detect a negative shift as an undefined behaviour and reports exception. So we add the protection to avoid the length exceeding 32. Or else it will return out of range error and stop decoding.
En el kernel de Linux, se resolvió la siguiente vulnerabilidad: netfilter: nf_conntrack_h323: Agregar protección para longitud de bmp fuera de rango La carga de UBSAN informa una excepción de BRK#5515 SHIFT_ISSUE: desplazamientos bit a bit que están fuera de los límites para su tipo de datos. vmlinux get_bitmap(b=75) + 712 vmlinux decode_seq(bs=0xFFFFFFD008037000, f=0xFFFFFFD008037018, nivel=134443100) + 1956 vmlinux decode_choice (base=0xFFFFFFD0080370F0, nivel=23843636) + 1216 vmlinux decode_seq(f=0xFFFFFFD0080371A8, nivel=134443500) + 812 vmlinux decode_choice(base =0xFFFFFFD008037280, nivel=0) + 1216 vmlinux DecodeRasMessage() + 304 vmlinux ras_help() + 684 vmlinux nf_confirm() + 188 Debido a datos anormales en skb->data, la longitud del mapa de bits de la extensión excede 32 cuando se decodifica el mensaje ras y luego usa la longitud para realizar una operación de cambio . Cambiará a negativo después de varios bucles. La carga de UBSAN podría detectar un cambio negativo como un comportamiento indefinido e informar una excepción. Por lo tanto, agregamos la protección para evitar que la longitud exceda 32. De lo contrario, devolverá un error fuera de rango y dejará de decodificar.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
| Attack Vector | LOCAL |
|---|---|
| Attack Complexity | LOW |
| Privileges Required | LOW |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | NONE |
| Integrity Impact | NONE |
| Availability Impact | HIGH |
| Source | Type | Description |
|---|---|---|
| [email protected] | Primary |
en
CWE-787
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd369493c00> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd3694916c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd340b70f40> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd340b701c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd3426e8cc0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd36b2c4280> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd369492e00> | Operating System |
| linux | linux_kernel | 6.8 | <built-in method update of dict object at 0x7fd3606cd5c0> | Operating System |
| linux | linux_kernel | 6.8 | <built-in method update of dict object at 0x7fd3606cec00> | Operating System |
| linux | linux_kernel | 6.8 | <built-in method update of dict object at 0x7fd3694aeec0> | Operating System |
| linux | linux_kernel | 6.8 | <built-in method update of dict object at 0x7fd3606cff40> | Operating System |
| linux | linux_kernel | 6.8 | <built-in method update of dict object at 0x7fd3606cd4c0> | Operating System |
| linux | linux_kernel | 6.8 | <built-in method update of dict object at 0x7fd3606cc240> | Operating System |
| debian | debian_linux | 10.0 | <built-in method update of dict object at 0x7fd39c47d840> | 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:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.8:rc4:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.8:rc5:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.8:rc6:*:*:*:*:*:* |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |