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CVE-2020-11501

Published: 3 April 2020

GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is 3.6.3 (2018-07-16) because of an error in a 2017-10-06 commit. The DTLS client always uses 32 '\0' bytes instead of a random value, and thus contributes no randomness to a DTLS negotiation. This breaks the security guarantees of the DTLS protocol.

Priority

Medium

Cvss 3 Severity Score

7.4

Score breakdown

Status

Package Release Status
gnutls28
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(3.5.18-1ubuntu1.3)
eoan
Released (3.6.9-5ubuntu1.1)
trusty Does not exist

upstream
Released (3.6.13-2)
xenial Not vulnerable
(3.4.10-4ubuntu1.7)
Patches:
upstream: https://gitlab.com/gnutls/gnutls/-/commit/c01011c2d8533dbbbe754e49e256c109cb848d0d

Severity score breakdown

Parameter Value
Base score 7.4
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N