CVE-2017-2669

Name	CVE-2017-2669
Description	Dovecot before version 2.2.29 is vulnerable to a denial of service. When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion. Sending specially crafted %variable fields could result in excessive memory usage causing the process to crash (and restart), or excessive CPU usage causing all authentications to hang.
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)
Debian Bugs	860049

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
dovecot (PTS)	buster	1:2.3.4.1-5+deb10u6	fixed
	buster (security)	1:2.3.4.1-5+deb10u7	fixed
	bullseye	1:2.3.13+dfsg1-2+deb11u1	fixed
	bookworm, sid	1:2.3.19.1+dfsg1-2.1	fixed

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

Package	Type	Release	Fixed Version	Debian Bugs
dovecot	source	wheezy	(not affected)
dovecot	source	jessie	(not affected)
dovecot	source	(unstable)	1:2.2.27-3	860049

Notes

[jessie] - dovecot <not-affected> (Vulnerable code not present)
[wheezy] - dovecot <not-affected> (Vulnerable code not present)
Fixed by: https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735
Introduced by: https://github.com/dovecot/core/commit/a3783f8a3c9cd816b51e77a922f82301512fcf22