In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() In DecodeQ931(), the UserUserIE code path reads a 16-bit length from the packet, then decrements it by 1 to skip the protocol discriminator byte before passing it to DecodeH323_UserInformation(). If the encoded length is 0, the decrement wraps to -1, which is then passed as a large value to the decoder, leading to an out-of-bounds read. Add a check to ensure len is positive after the decrement.
En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: netfilter: nf_conntrack_h323: comprobación de longitud cero en DecodeQ931() En DecodeQ931(), la ruta de código UserUserIE lee una longitud de 16 bits del paquete, luego la decrementa en 1 para omitir el byte discriminador del protocolo antes de pasarla a DecodeH323_UserInformation(). Si la longitud codificada es 0, el decremento se ajusta a -1, que luego se pasa como un valor grande al decodificador, lo que lleva a una lectura fuera de límites. Se añade una comprobación para asegurar que 'len' sea positivo después del decremento.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
| Attack Vector | NETWORK |
|---|---|
| Attack Complexity | LOW |
| Privileges Required | NONE |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | HIGH |
| Integrity Impact | NONE |
| Availability Impact | HIGH |
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Type: Secondary
Exploitability Score: 3.9
Impact Score: 5.2
| Source | Type | Description |
|---|---|---|
| [email protected] | Primary |
en
CWE-125
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d23a5312bc0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d23ac6c12c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d23af4b3d40> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d23a59c9a80> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d23a53113c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d23a5311540> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d23a5311480> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d23bea20740> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d23af70ba00> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d23a5311280> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d2364d687c0> | 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:7.0:rc1:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* |