CVE-2020-13777

MEDIUM

Description

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.

References

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00015.html

https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03

https://lists.fedoraproject.org/archives/list/[email protected]/message/6C4DHUKV6M6SJ5CV6KVHZNHNF7HCUE5P/

https://lists.fedoraproject.org/archives/list/[email protected]/message/6RTXZOXC4MHTFE2HKY6IAZMF2WHD2WMV/

https://lists.fedoraproject.org/archives/list/[email protected]/message/RRQBFK3UZ7SV76IYDTS4PS6ABS2DSJHK/

https://lists.fedoraproject.org/archives/list/[email protected]/message/VMB3UGI5H5RCFRU6OGRPMNUCNLJGEN7Y/

https://security.gentoo.org/glsa/202006-01

https://security.netapp.com/advisory/ntap-20200619-0004/

https://usn.ubuntu.com/4384-1/

https://www.debian.org/security/2020/dsa-4697

Details

Source: MITRE

Published: 2020-06-04

Updated: 2020-06-19

Type: CWE-327

Risk Information

CVSS v2.0

Base Score: 5.8

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N

Impact Score: 4.9

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3.0

Base Score: 7.4

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Impact Score: 5.2

Exploitability Score: 2.2

Severity: HIGH