| 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, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, 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+deb10u9 | fixed |
| bullseye (security), bullseye | 4.94.2-7+deb11u2 | fixed |
| bookworm, bookworm (security) | 4.96-15+deb12u4 | fixed |
| trixie | 4.97-5 | fixed |
| sid | 4.97-8 | fixed |
The information below is based on the following data on fixed versions.
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