CVE-2020-10030

Name	CVE-2020-10030
Description	An issue has been found in PowerDNS Recursor 4.1.0 up to and including 4.3.0. It allows an attacker (with enough privileges to change the system's hostname) to cause disclosure of uninitialized memory content via a stack-based out-of-bounds read. It only occurs on systems where gethostname() does not have '\0' termination of the returned string if the hostname is larger than the supplied buffer. (Linux systems are not affected because the buffer is always large enough. OpenBSD systems are not affected because the returned hostname always has '\0' termination.) Under some conditions, this issue can lead to the writing of one '\0' byte out-of-bounds on the stack, causing a denial of service or possibly arbitrary code execution.
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
pdns-recursor (PTS)	jessie, jessie (lts)	3.6.2-2+deb8u4	vulnerable
	buster (security), buster, buster (lts)	4.1.11-1+deb10u2	vulnerable
	bullseye	4.4.2-3	fixed
	bookworm (security), bookworm	4.8.8-1	fixed
	sid, trixie	5.1.3-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
pdns-recursor	source	wheezy	(unfixed)	end-of-life
pdns-recursor	source	(unstable)	4.3.1-1	unimportant

Notes

https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-03.html
https://www.openwall.com/lists/oss-security/2020/05/19/3
Non exploitable on Linux