CVE-2024-25629

Name	CVE-2024-25629
Description	c-ares is a C library for asynchronous DNS requests. `ares__read_line()` is used to parse local configuration files such as `/etc/resolv.conf`, `/etc/nsswitch.conf`, the `HOSTALIASES` file, and if using a c-ares version prior to 1.27.0, the `/etc/hosts` file. If any of these configuration files has an embedded `NULL` character as the first character in a new line, it can lead to attempting to read memory prior to the start of the given buffer which may result in a crash. This issue is fixed in c-ares 1.27.0. No known workarounds exist.
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
c-ares (PTS)	buster	1.14.0-1+deb10u1	vulnerable
	buster (security)	1.14.0-1+deb10u4	vulnerable
	bullseye (security), bullseye	1.17.1-1+deb11u3	vulnerable
	bookworm	1.18.1-3	vulnerable
	sid, trixie	1.28.1-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
c-ares	source	(unstable)	1.27.0-1

Notes

[bookworm] - c-ares <no-dsa> (Minor issue)
[bullseye] - c-ares <no-dsa> (Minor issue)
[buster] - c-ares <no-dsa> (Minor issue)
https://github.com/c-ares/c-ares/security/advisories/GHSA-mg26-v6qh-x48q
https://github.com/c-ares/c-ares/commit/a804c04ddc8245fc8adf0e92368709639125e183 (cares-1_27_0)