DescriptionA Bleichenbacher type side-channel based padding oracle attack was found in the way gnutls handles verification of RSA decrypted PKCS#1 v1.5 data. An attacker who is able to run process on the same physical core as the victim process, could use this to extract plaintext or in some cases downgrade any TLS connections to a vulnerable server.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
gnutls28 (PTS)buster3.6.7-4+deb10u8fixed
buster (security)3.6.7-4+deb10u10fixed
bullseye (security)3.7.1-5+deb11u3fixed
bookworm, sid3.7.9-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[stretch] - gnutls28 <no-dsa> (Minor issue)
[jessie] - gnutls28 <ignored> (Too invasive to fix, requires newer nettle shared lib -
CVE-2018-16869 must be fixed first and a new build dependency on this new
nettle version.

Search for package or bug name: Reporting problems