CVE-2021-32919

Name	CVE-2021-32919
Description	An issue was discovered in Prosody before 0.11.9. The undocumented dialback_without_dialback option in mod_dialback enables an experimental feature for server-to-server authentication. It does not correctly authenticate remote server certificates, allowing a remote server to impersonate another server (when this option is enabled).
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
References	DSA-4916-1
Debian Bugs	988668

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
prosody (PTS)	buster, buster (security)	0.11.2-1+deb10u4	fixed
	bullseye (security), bullseye	0.11.9-2+deb11u2	fixed
	bookworm, sid	0.12.3-1	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
prosody	source	stretch	(not affected)
prosody	source	buster	0.11.2-1+deb10u1	DSA-4916-1
prosody	source	(unstable)	0.11.9-1		988668

Notes

[stretch] - prosody <not-affected> (Vulnerable code (=dwd) introduced later)
https://www.openwall.com/lists/oss-security/2021/05/13/1
https://prosody.im/security/advisory_20210512.txt
https://hg.prosody.im/trunk/rev/6be890ca492e
https://hg.prosody.im/trunk/rev/d0e9ffccdef9