| Name | CVE-2023-42119 |
| Description | Exim dnsdb Out-Of-Bounds Read Information Disclosure Vulnerability. This vulnerability allows network-adjacent attackers to disclose sensitive information 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 read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the service account.
. Was ZDI-CAN-17643. |
| 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 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| exim4 (PTS) | jessie, jessie (lts) | 4.84.2-2+deb8u12 | vulnerable |
| stretch (security) | 4.89-2+deb9u8 | vulnerable |
| stretch (lts), stretch | 4.89-2+deb9u13 | vulnerable |
| buster, buster (lts) | 4.92-8+deb10u10 | vulnerable |
| 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 |
| sid, trixie | 4.98-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| 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 | | | |
Notes
[buster] - exim4 <no-dsa> (Minor issue; use Exim4 with a trustworthy DNS resolver able to validate the data according to the DNS record types)
https://www.zerodayinitiative.com/advisories/ZDI-23-1473/
https://bugs.exim.org/show_bug.cgi?id=3033
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/commitdiff/f6b1f8e7d642f82d830a71b78699a4349e0158e1 (exim-4.96.2)
[stretch] - exim4 <no-dsa> (Minor issue; use Exim4 with a trustworthy DNS resolver able to validate the data according to the DNS record types)
[jessie] - exim4 <no-dsa> (Minor issue; use Exim4 with a trustworthy DNS resolver able to validate the data according to the DNS record types)