CVE-2009-3727 Information

Description

Asterisk Open Source 1.2.x before 1.2.35 1.4.x before 1.4.26.3 1.6.0.x before 1.6.0.17 and 1.6.1.x before 1.6.1.9; Business Edition A.x.x B.x.x before B.2.5.12 C.2.x.x before C.2.4.5 and C.3.x.x before C.3.2.2; AsteriskNOW 1.5; and s800i 1.3.x before 1.3.0.5 generate different error messages depending on whether a SIP username is valid which allows remote attackers to enumerate valid usernames via multiple crafted REGISTER messages with inconsistent usernames in the URI in the To header and the Digest in the Authorization header.

Reference

http://downloads.asterisk.org/pub/security/AST-2009-008.html http://osvdb.org/59697 http://secunia.com/advisories/37265 http://secunia.com/advisories/37479 http://secunia.com/advisories/37677 http://www.debian.org/security/2009/dsa-1952 http://www.securityfocus.com/bid/36924 http://www.securitytracker.com/id?1023133 https://bugzilla.redhat.com/show_bug.cgi?id=523277 https://bugzilla.redhat.com/show_bug.cgi?id=533137 https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00789.html https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00838.html