CVE-2023-42119

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)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
exim4 (PTS)	bullseye	4.94.2-7+deb11u2	vulnerable
	bullseye (security)	4.94.2-7+deb11u3	vulnerable
	bookworm	4.96-15+deb12u4	fixed
	bookworm (security)	4.96-15+deb12u5	fixed
	sid, trixie	4.98-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
exim4	source	bookworm	4.96-15+deb12u3
exim4	source	(unstable)	4.97~RC2-2

Notes

[bullseye] - exim4 <no-dsa> (Minor issue; use Exim4 with a trustworthy DNS resolver able to validate the data according to the DNS record types)
[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