CVE-2011-2666

Name	CVE-2011-2666
Description	The default configuration of the SIP channel driver in Asterisk Open Source 1.4.x through 1.4.41.2 and 1.6.2.x through 1.6.2.18.2 does not enable the alwaysauthreject option, which allows remote attackers to enumerate account names by making a series of invalid SIP requests and observing the differences in the responses for different usernames, a different vulnerability than CVE-2011-2536.
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
asterisk (PTS)	buster	1:16.2.1~dfsg-1+deb10u2	fixed
	buster (security)	1:16.28.0~dfsg-0+deb10u4	fixed
	bullseye	1:16.28.0~dfsg-0+deb11u3	fixed
	bullseye (security)	1:16.28.0~dfsg-0+deb11u4	fixed
	sid	1:20.6.0~dfsg+~cs6.13.40431414-2	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
asterisk	source	(unstable)	1:1.8.3.3-1

[squeeze] - asterisk <no-dsa> (minor issue; can be addressed through configuration)