CVE-2023-31147

Name	CVE-2023-31147
Description	c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1.
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)	bullseye (security), bullseye	1.17.1-1+deb11u3	vulnerable
	bookworm	1.18.1-3	vulnerable
	sid, trixie	1.34.4-1	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	experimental	1.19.1-1
c-ares	source	(unstable)	1.19.1-2	unimportant

Notes

https://github.com/c-ares/c-ares/security/advisories/GHSA-8r8p-23f3-64c2
https://github.com/c-ares/c-ares/commit/823df3b989e59465d17b0a2eb1239a5fc048b4e5 (cares-1_19_1)
Any Debian system/port provides /dev/urandom