CVE-2020-13777
First published: Wed Jun 03 2020(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/gnutls28 | <=3.6.13-4<=3.6.4-1<=3.6.7-4+deb10u3 | 3.6.14-1 3.6.7-4+deb10u4 |
| redhat/gnutls | <3.6.14 | 3.6.14 |
| ubuntu/gnutls28 | <3.6.9-5ubuntu1.2 | 3.6.9-5ubuntu1.2 |
| ubuntu/gnutls28 | <3.6.13-2ubuntu1.1 | 3.6.13-2ubuntu1.1 |
| ubuntu/gnutls28 | <3.6.14 | 3.6.14 |
| debian/gnutls28 | 3.7.1-5+deb11u5 3.7.1-5+deb11u3 3.7.9-2+deb12u3 3.8.6-2 | |
| GNU GnuTLS | >=3.6.0<3.6.14 | |
| Fedoraproject Fedora | =31 | |
| Fedoraproject Fedora | =32 | |
| Ubuntu Linux | =19.10 | |
| Ubuntu Linux | =20.04 | |
| Debian Debian Linux | =10.0 |
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Reference Links
- 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/package-announce@lists.fedoraproject.org/message/6C4DHUKV6M6SJ5CV6KVHZNHNF7HCUE5P/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6RTXZOXC4MHTFE2HKY6IAZMF2WHD2WMV/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RRQBFK3UZ7SV76IYDTS4PS6ABS2DSJHK/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/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
- https://gitlab.com/gnutls/gnutls/-/issues/1011
- https://security-tracker.debian.org/tracker/CVE-2020-13777
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13777
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=962289
- https://launchpad.net/bugs/cve/CVE-2020-13777
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1843724
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1843726
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1843725
- https://gitlab.com/gnutls/gnutls/-/merge_requests/1275/diffs?commit_id=c2646aeee94e71cb15c90a3147cf3b5b0ca158ca
- https://gitlab.com/gnutls/gnutls/-/merge_requests/1275/diffs?commit_id=3d7fae761e65e9d0f16d7247ee8a464d4fe002da
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-06-03
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1843723#c16
- https://access.redhat.com/security/cve/CVE-2020-13777
- https://access.redhat.com/errata/RHSA-2020:2639
- https://access.redhat.com/errata/RHSA-2020:2638
- https://access.redhat.com/errata/RHSA-2020:2637
- https://access.redhat.com/security/cve/cve-2020-13777
- https://bugzilla.redhat.com/show_bug.cgi?id=1843723
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6C4DHUKV6M6SJ5CV6KVHZNHNF7HCUE5P/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6RTXZOXC4MHTFE2HKY6IAZMF2WHD2WMV/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RRQBFK3UZ7SV76IYDTS4PS6ABS2DSJHK/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VMB3UGI5H5RCFRU6OGRPMNUCNLJGEN7Y/
- https://gitlab.com/gnutls/gnutls/-/commit/c2646aeee94e71cb15c90a3147cf3b5b0ca158ca
- https://gitlab.com/gnutls/gnutls/-/commit/3d7fae761e65e9d0f16d7247ee8a464d4fe002da
- https://ubuntu.com/security/notices/USN-4384-1
- https://www.cve.org/CVERecord?id=CVE-2020-13777
- https://nvd.nist.gov/vuln/detail/CVE-2020-13777
- https://ubuntu.com/security/CVE-2020-13777
Frequently Asked Questions
What is CVE-2020-13777?
CVE-2020-13777 is a vulnerability in GnuTLS 3.6.x before 3.6.14 that uses incorrect cryptography for encrypting a session ticket, resulting in a loss of confidentiality in TLS 1.2 and an authentication bypass in TLS 1.3.
What is the severity of CVE-2020-13777?
The severity of CVE-2020-13777 is high with a severity value of 7.4.
Which software versions are affected by CVE-2020-13777?
GnuTLS versions before 3.6.14 are affected by CVE-2020-13777.
How do I fix CVE-2020-13777?
To fix CVE-2020-13777, update GnuTLS to version 3.6.14 or later.
Where can I find more information about CVE-2020-13777?
You can find more information about CVE-2020-13777 on the following links: - [GitLab](https://gitlab.com/gnutls/gnutls/-/issues/1011) - [Debian Security Tracker](https://security-tracker.debian.org/tracker/CVE-2020-13777) - [CVE Mitre](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13777)
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