The SIP over UDP implementation in Asterisk Open Source 1.4.x before 1.4.43, 1.6.x before 188.8.131.52, and 1.8.x before 184.108.40.206 uses different port numbers for responses to invalid requests depending on whether a SIP username exists, which allows remote attackers to enumerate usernames via a series of requests.
Publish Date : 2011-12-14 Last Update Date : 2012-11-06
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify
a vulnerability or a missing patch. Check out the OVAL definitions
if you want to learn what you should do to verify a vulnerability.