CVE-2020-28025

NameCVE-2020-28025
DescriptionExim 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-2650-1, DSA-4912-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
exim4 (PTS)bullseye4.94.2-7+deb11u2fixed
bullseye (security)4.94.2-7+deb11u3fixed
bookworm4.96-15+deb12u4fixed
bookworm (security)4.96-15+deb12u5fixed
trixie4.98~RC3-2fixed
sid4.98-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
exim4sourcestretch4.89-2+deb9u8DLA-2650-1
exim4sourcebuster4.92-8+deb10u6DSA-4912-1
exim4source(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

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