CVE-2023-42114

Name	CVE-2023-42114
Description	Exim NTLM Challenge Out-Of-Bounds Read Information Disclosure Vulnerability. This vulnerability allows remote attackers to disclose sensitive information on affected installations of Exim. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of NTLM challenge requests. 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 data structure. An attacker can leverage this vulnerability to disclose information in the context of the service account. Was ZDI-CAN-17433.
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-3599-1, DSA-5512-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
exim4 (PTS)	bullseye	4.94.2-7+deb11u2	fixed
	bullseye (security)	4.94.2-7+deb11u3	fixed
	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	Origin
exim4	source	buster	4.92-8+deb10u8	DLA-3599-1
exim4	source	bullseye	4.94.2-7+deb11u1	DSA-5512-1
exim4	source	bookworm	4.96-15+deb12u2	DSA-5512-1
exim4	source	(unstable)	4.97~RC1-2

Notes

https://www.zerodayinitiative.com/advisories/ZDI-23-1468/
https://bugs.exim.org/show_bug.cgi?id=3001
https://git.exim.org/exim.git/log/refs/heads/exim-4.96%20security/exim.git/commit/ccf9816f54fb04ab5508eb8c7f00b08bc3531297
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