CVE-2020-12403

Name	CVE-2020-12403
Description	A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS in versions before 3.55. When using multi-part Chacha20, it could cause out-of-bounds reads. This issue was fixed by explicitly disabling multi-part ChaCha20 (which was not functioning correctly) and strictly enforcing tag length. The highest threat from this vulnerability is to confidentiality and system availability.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2388-1, DLA-3327-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
nss (PTS)	buster	2:3.42.1-1+deb10u5	vulnerable
	buster (security)	2:3.42.1-1+deb10u8	fixed
	bullseye (security), bullseye	2:3.61-1+deb11u3	fixed
	bookworm	2:3.87.1-1	fixed
	sid, trixie	2:3.99-1	fixed

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

Package	Type	Release	Fixed Version	Origin
nss	source	stretch	2:3.26.2-1.1+deb9u2	DLA-2388-1
nss	source	buster	2:3.42.1-1+deb10u6	DLA-3327-1
nss	source	(unstable)	2:3.55-1

Notes

https://hg.mozilla.org/projects/nss/rev/f282556e6cc7715f5754aeaadda6f902590e7e38
https://hg.mozilla.org/projects/nss/rev/c25adfdfab34ddb08d3262aac3242e3399de1095
https://bugzilla.mozilla.org/show_bug.cgi?id=1636771
https://bugzilla.redhat.com/show_bug.cgi?id=1868931