Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gnu | Gnutls | >= 3.6.0, < 3.6.14 |
| Fedoraproject | Fedora | 31 |
| Canonical | Ubuntu Linux | 19.10 |
| Debian | Debian Linux | 10.0 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00015.htmlBroken Link
- https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202006-01Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200619-0004/Third Party Advisory
- https://usn.ubuntu.com/4384-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4697Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00015.htmlBroken Link
- https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
FAQ
What is CVE-2020-13777?
CVE-2020-13777 is a vulnerability with a CVSS score of 7.4 (HIGH). 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...
How severe is CVE-2020-13777?
CVE-2020-13777 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-13777?
Check the references section above for vendor advisories and patch information. Affected products include: Gnu Gnutls, Fedoraproject Fedora, Canonical Ubuntu Linux, Debian Debian Linux.