CVE-2020-13777

NameCVE-2020-13777
DescriptionGnuTLS 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDSA-4697-1
NVD severitymedium
Debian Bugs962289

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
gnutls28 (PTS)stretch3.5.8-5+deb9u4fixed
stretch (security)3.5.8-5+deb9u1fixed
buster3.6.7-4+deb10u3vulnerable
buster (security)3.6.7-4+deb10u4fixed
bullseye, sid3.6.14-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
gnutls28source(unstable)3.6.14-1962289
gnutls28sourcebuster3.6.7-4+deb10u4DSA-4697-1
gnutls28sourcejessie(not affected)
gnutls28sourcestretch(not affected)

Notes

[stretch] - gnutls28 <not-affected> (Vulnerable code introduced in 3.6.4)
[jessie] - gnutls28 <not-affected> (Vulnerable code introduced in 3.6.4)
https://bugzilla.redhat.com/show_bug.cgi?id=1843723
https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03
https://gitlab.com/gnutls/gnutls/-/issues/1011
https://gitlab.com/gnutls/gnutls/-/commit/c2646aeee94e71cb15c90a3147cf3b5b0ca158ca
https://gitlab.com/gnutls/gnutls/-/commit/3d7fae761e65e9d0f16d7247ee8a464d4fe002da

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