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CVE-2020-13777

Published: 4 June 2020

GnuTLS 3.6.x before 3.6.14 uses incorrect cryptography for encrypting a session ticket (a loss of confidentiality in TLS 1.2, and an authentication bypass in TLS 1.3). The earliest affected version is 3.6.4 (2018-09-24) because of an error in a 2018-09-18 commit. Until the first key rotation, the TLS server always uses wrong data in place of an encryption key derived from an application.

Notes

AuthorNote
mdeslaur
introduced in 3.6.4

Priority

High

Cvss 3 Severity Score

7.4

Score breakdown

Status

Package Release Status
gnutls28
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
eoan
Released (3.6.9-5ubuntu1.2)
focal
Released (3.6.13-2ubuntu1.1)
trusty Does not exist

upstream
Released (3.6.14)
xenial Not vulnerable
(code not present)
Patches:
upstream: https://gitlab.com/gnutls/gnutls/-/commit/c2646aeee94e71cb15c90a3147cf3b5b0ca158ca
upstream: https://gitlab.com/gnutls/gnutls/-/commit/3d7fae761e65e9d0f16d7247ee8a464d4fe002da

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