| Name | CVE-2023-42117 |
| Description | Exim Improper Neutralization of Special Elements Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability. The specific flaw exists within the smtp service, which listens on TCP port 25 by default. The issue results from the lack of proper validation of user-supplied data, which can result in a memory corruption condition. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-17554. |
| 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-3938-1, ELA-1246-1 |
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 | vulnerable | |
| stretch (lts), stretch | 4.89-2+deb9u14 | fixed | |
| buster, buster (lts) | 4.92-8+deb10u11 | fixed | |
| buster (security) | 4.92-8+deb10u9 | vulnerable | |
| bullseye | 4.94.2-7+deb11u3 | vulnerable | |
| 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+deb8u13 | ELA-1246-1 | ||
| exim4 | source | stretch | 4.89-2+deb9u14 | ELA-1246-1 | ||
| exim4 | source | buster | 4.92-8+deb10u11 | ELA-1246-1 | ||
| exim4 | source | bullseye | 4.94.2-7+deb11u4 | DLA-3938-1 | ||
| exim4 | source | bookworm | 4.96-15+deb12u3 | |||
| exim4 | source | (unstable) | 4.97~RC2-2 |
[buster] - exim4 <no-dsa> (Only an issue if Exim4 run behind an untrusted proxy-protocol proxy)
https://www.zerodayinitiative.com/advisories/ZDI-23-1471/
https://bugs.exim.org/show_bug.cgi?id=3031
https://www.openwall.com/lists/oss-security/2023/09/29/5
https://www.openwall.com/lists/oss-security/2023/10/01/4
https://exim.org/static/doc/security/CVE-2023-zdi.txt
Fixed by: https://git.exim.org/exim.git/commit/a95acb1c19c2e3600ef327c71318e33316d34440 (exim-4.96.2)
Fixed by: https://git.exim.org/exim.git/commit/654056e44fc93a0ee7c09d1228933e8af6862206 (exim-4.96.2)