DescriptionIt was found that Diffie Hellman Client key exchange handling in NSS 3.21.x was vulnerable to small subgroup confinement attack. An attacker could use this flaw to recover private keys by confining the client DH key to small subgroup of the desired group.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
nss (PTS)jessie, jessie (lts)2:3.26-1+debu8u18fixed
stretch (security)2:3.26.2-1.1+deb9u5fixed
stretch (lts), stretch2:3.26.2-1.1+deb9u7fixed
buster (security)2:3.42.1-1+deb10u8fixed
bullseye (security), bullseye2:3.61-1+deb11u3fixed
sid, trixie2:3.99-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


Patch as applied in CentOS (but contains other changes):!nss!/aada6b10b73091276397404059605d13e7548462/SOURCES!moz-1314604.patch
Further info:
Upstream bug:

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