An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.
Se detectó un problema en GnuTLS versiones anteriores a 3.6.15. Un servidor puede desencadenar una desreferencia del puntero NULL en un cliente TLS versión 1.3, si una alerta no_renegotiation es enviada con una sincronización no prevista y luego se produce un segundo protocolo de enlace no válido. El bloqueo ocurre en la ruta de manejo de errores de la aplicación, donde la función gnutls_deinit es llamada después de detectar un fallo en el protocolo de enlace
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
| Attack Vector | NETWORK |
|---|---|
| Attack Complexity | LOW |
| Privileges Required | NONE |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | NONE |
| Integrity Impact | NONE |
| Availability Impact | HIGH |
AV:N/AC:L/Au:N/C:N/I:N/A:P
| Access Vector | NETWORK |
|---|---|
| Access Complexity | LOW |
| Authentication | NONE |
| Confidentiality Impact | NONE |
| Integrity Impact | NONE |
| Availability Impact | PARTIAL |
| Source | Type | Description |
|---|---|---|
| [email protected] | Primary |
en
CWE-476
en
CWE-787
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| gnu | gnutls | * | <built-in method update of dict object at 0x7fd2d3999e40> | Application |
| fedoraproject | fedora | 32 | <built-in method update of dict object at 0x7fd340f0f340> | Operating System |
| fedoraproject | fedora | 33 | <built-in method update of dict object at 0x7fd36b381280> | Operating System |
| opensuse | leap | 15.1 | <built-in method update of dict object at 0x7fd340f0ce00> | Operating System |
| opensuse | leap | 15.2 | <built-in method update of dict object at 0x7fd2d399a7c0> | Operating System |
| canonical | ubuntu_linux | 20.04 | <built-in method update of dict object at 0x7fd2d39994c0> | Operating System |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:a:gnu:gnutls:*:*:*:*:*:*:*:* |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:* |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* |