CVE-2020-13777
High
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.
SeverityHigh
CVSS7.4
Exploit probability—
Product
Gnutls
PublishedJun 4, 2020
First seenJun 4, 2020
How to fix
Update
- gnu gnutls3.6.14 or later
Vendor advisories
- debian.org/security/2020/dsa-4697
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VMB3UGI5H5RCFRU6OGRPMNUCNLJGEN7Y/
- security.gentoo.org/glsa/202006-01
- usn.ubuntu.com/4384-1/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6C4DHUKV6M6SJ5CV6KVHZNHNF7HCUE5P/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RRQBFK3UZ7SV76IYDTS4PS6ABS2DSJHK/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6RTXZOXC4MHTFE2HKY6IAZMF2WHD2WMV/
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| gnu gnutls | 3.6.0 ≤ v < 3.6.14 | 3.6.14 |
| fedoraproject fedora | 31, 32 | — |
| canonical ubuntu_linux | 19.10, 20.04 | — |
| debian debian_linux | 10.0 | — |
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