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Category:   Application (VoIP)  >   Asterisk Vendors:   Digium (Linux Support Services)
Asterisk Discloses Username Validity to Remote Users
SecurityTracker Alert ID:  1025734
SecurityTracker URL:  http://securitytracker.com/id/1025734
CVE Reference:   CVE-2011-2536   (Links to External Site)
Date:  Jun 29 2011
Impact:   Disclosure of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 1.4.41.2, 1.6.2.18.2, 1.8.4.4
Description:   A vulnerability was reported in Asterisk. A remote user can determine valid SIP usernames.

The system may respond differently to remote SIP requests from an invalid SIP user than it responds to a valid SIP user (as configured on the target system). This may occur even when the alwaysauthreject option is set in the configuration.

A remote user can exploit this to determine valid SIP usernames.

Impact:   A remote user can determine valid SIP usernames.
Solution:   The vendor has issued a fix (Open Source 1.4.41.2, 1.6.2.18.2, 1.8.4.4; Business Edition C.3.7.3).

The vendor's advisory is available at:

http://downloads.asterisk.org/pub/security/AST-2011-011.html

Vendor URL:  downloads.asterisk.org/pub/security/AST-2011-011.html (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.


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