DescriptionA vulnerability exists where it possible to force Network Security Services (NSS) to sign CertificateVerify with PKCS#1 v1.5 signatures when those are the only ones advertised by server in CertificateRequest in TLS 1.3. PKCS#1 v1.5 signatures should not be used for TLS 1.3 messages. This vulnerability affects Firefox < 68.
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)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid72.0.2-1fixed
nss (PTS)jessie2:3.26-1+debu8u3vulnerable
jessie (security)2:3.26-1+debu8u10vulnerable
stretch (security), stretch2:3.26.2-1.1+deb9u1vulnerable
buster (security)2:3.42.1-1+deb10u2fixed
bullseye, sid2:3.49.1-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[stretch] - nss <no-dsa> (Minor issue)
[jessie] - nss <ignored> (Issue is specific to TLS 1.3 and support was not really complete in 3.26; code has diverged significantly since and applying the fix would be very disruptive)
firefox-esr in older suites than buster use the embedded copy and thus issue
is just fixed by updating firefox-esr to 60.8.0. For the others an update to
src:nss is needed as firefox-esr uses the system library.

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