CVE-2020-13777
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.
- Score
- CVSS 3.1 7.4 High
- Status
- Modified - cve@mitre.org
- Published
- 2020-06-04
- Last modified
- 2026-10-14
- Weaknesses
- CWE-327
Affected products
- Ubuntu Linux (Canonical)
- Debian Linux (Debian)
- Fedora (Fedoraproject)
- Gnutls (Gnu)
- Simatic S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
- Simatic S7-1500 Cpu 1518f-4 Pndp Mfp (Siemens)
- Siplus S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
References
- https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03
- https://www.debian.org/security/2020/dsa-4697
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VMB3UGI5H5RCFRU6OGRPMN…
- https://security.gentoo.org/glsa/202006-01
- https://usn.ubuntu.com/4384-1/
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00015.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6C4DHUKV6M6SJ5CV6KVHZN…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RRQBFK3UZ7SV76IYDTS4PS…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6RTXZOXC4MHTFE2HKY6IAZ…
- https://security.netapp.com/advisory/ntap-20200619-0004/
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
