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.
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
| Link | Tags |
|---|---|
| http://secunia.com/advisories/37265 | third party advisory vendor advisory |
| https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00838.html | vendor advisory |
| http://secunia.com/advisories/37479 | third party advisory |
| http://secunia.com/advisories/37677 | third party advisory |
| http://www.debian.org/security/2009/dsa-1952 | vendor advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=523277 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=533137 | |
| http://www.securityfocus.com/bid/36924 | vdb entry patch |
| https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00789.html | vendor advisory |
| http://osvdb.org/59697 | vdb entry |
| http://downloads.asterisk.org/pub/security/AST-2009-008.html | vendor advisory |
| http://www.securitytracker.com/id?1023133 | vdb entry |