CVE-2020-28013
Description
Exim 4 before 4.94.2 allows Heap-based Buffer Overflow because it mishandles "-F '.('" on the command line, and thus may allow privilege escalation from any user to root. This occurs because of the interpretation of negative sizes in strncpy.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Mitigation details
CVE-2020-28013 NameCVE-2020-28013 DescriptionExim 4 before 4.94.2 allows Heap-based Buffer Overflow because it mishandles "-F '.('" on the command line, and thus may allow privilege escalation from any user to root. This occurs because of the interpretation of negative sizes in strncpy. SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE…
CVE-2020-28013
| Name | CVE-2020-28013 |
| Description | Exim 4 before 4.94.2 allows Heap-based Buffer Overflow because it mishandles "-F '.('" on the command line, and thus may allow privilege escalation from any user to root. This occurs because of the interpretation of negative sizes in strncpy. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, 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) | bullseye | 4.94.2-7+deb11u3 | fixed |
| bullseye (security) | 4.94.2-7+deb11u5 | fixed | |
| bookworm | 4.96-15+deb12u9 | fixed | |
| bookworm (security) | 4.96-15+deb12u10 | fixed | |
| trixie | 4.98.2-1+deb13u2 | fixed | |
| trixie (security) | 4.98.2-1+deb13u3 | fixed | |
| forky, sid | 4.99.3-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| 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
https://www.openwall.com/lists/oss-security/2021/05/04/7
Apply commands
https://www.openwall.com/lists/oss-security/2021/05/04/7OS impact
Arch Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Fixed | 4.94.2-1 |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 4.94.2-1 |
| sid | Fixed | 4.94.2-1 |
| forky | Fixed | 4.94.2-1 |
| bullseye | Fixed | 4.94.2-1 |
| bookworm | Fixed | 4.94.2-1 |
References
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.