CVE-2020-28025

Name	CVE-2020-28025
Description	Exim 4 before 4.94.2 allows Out-of-bounds Read because pdkim_finish_bodyhash does not validate the relationship between sig->bodyhash.len and b->bh.len; thus, a crafted DKIM-Signature header might lead to a leak of sensitive information from process memory.
Source	CVE (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)
References	DLA-2650-1, DSA-4912-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
exim4 (PTS)	buster	4.92-8+deb10u6	fixed
	buster (security)	4.92-8+deb10u7	fixed
	bullseye	4.94.2-7	fixed
	bookworm, sid	4.96-15	fixed

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

Package	Type	Release	Fixed Version	Origin
exim4	source	stretch	4.89-2+deb9u8	DLA-2650-1
exim4	source	buster	4.92-8+deb10u6	DSA-4912-1
exim4	source	(unstable)	4.94.2-1

Notes

Introduced by: https://git.exim.org/exim.git/commit/80a47a2c9633437d4ceebd214cd44abfbd4f4543 (exim-4_70_RC3)
https://www.openwall.com/lists/oss-security/2021/05/04/7