CVE-2020-13777

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.

Category

7.4
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 1.08% Top 25%
Vendor Advisory debian.org Vendor Advisory fedoraproject.org Vendor Advisory gentoo.org Vendor Advisory ubuntu.com Vendor Advisory opensuse.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory gnutls.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03 vendor advisory
https://www.debian.org/security/2020/dsa-4697 third party advisory vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VMB3UGI5H5RCFRU6OGRPMNUCNLJGEN7Y/ vendor advisory
https://security.gentoo.org/glsa/202006-01 third party advisory vendor advisory
https://usn.ubuntu.com/4384-1/ third party advisory vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00015.html vendor advisory broken link
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6C4DHUKV6M6SJ5CV6KVHZNHNF7HCUE5P/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RRQBFK3UZ7SV76IYDTS4PS6ABS2DSJHK/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6RTXZOXC4MHTFE2HKY6IAZMF2WHD2WMV/ vendor advisory
https://security.netapp.com/advisory/ntap-20200619-0004/ third party advisory

Frequently Asked Questions

What is the severity of CVE-2020-13777?
CVE-2020-13777 has been scored as a high severity vulnerability.
How to fix CVE-2020-13777?
To fix CVE-2020-13777, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-13777 being actively exploited in the wild?
It is possible that CVE-2020-13777 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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