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.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13777
Reference (s):
- https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03
- https://security.netapp.com/advisory/ntap-20200619-0004/
- DEBIAN:DSA-4697
- URL: https://www.debian.org/security/2020/dsa-4697
- FEDORA:FEDORA-2020-0cce3578e2