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CVE-2020-24659

Published: 4 September 2020

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.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
gnutls28
Launchpad, Ubuntu, Debian
trusty Does not exist

upstream
Released (3.6.15-1)
bionic Not vulnerable
(code not present)
focal
Released (3.6.13-2ubuntu1.3)
xenial Not vulnerable
(code not present)
Patches:
upstream: https://gitlab.com/gnutls/gnutls/-/commit/29ee67c205855e848a0a26e6d0e4f65b6b943e0a

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H