| 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, ELA-420-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| exim4 (PTS) | jessie, jessie (lts) | 4.84.2-2+deb8u13 | fixed |
| stretch (security) | 4.89-2+deb9u8 | fixed | |
| stretch (lts), stretch | 4.89-2+deb9u14 | fixed | |
| buster, buster (lts) | 4.92-8+deb10u11 | fixed | |
| buster (security) | 4.92-8+deb10u9 | fixed | |
| bullseye | 4.94.2-7+deb11u3 | fixed | |
| bullseye (security) | 4.94.2-7+deb11u4 | fixed | |
| bookworm | 4.96-15+deb12u6 | fixed | |
| bookworm (security) | 4.96-15+deb12u5 | fixed | |
| trixie | 4.98-2 | fixed | |
| sid | 4.98-3 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| exim4 | source | jessie | 4.84.2-2+deb8u8 | ELA-420-1 | ||
| 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 |
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