59697 : Asterisk SIP REGISTER Response Username Enumeration Weakness
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Disclosure Date


Asterisk contains a flaw that may allow an attacker to determine valid usernames. The issue is triggered when different responses are being sent using a valid or an invalid username in 'REGISTER' messages. This can be exploited to determine valid usernames by sending a specially crafted 'REGISTER' message. .


Location: Remote / Network Access
Impact: Loss of Confidentiality
Solution: Patch / RCS, Upgrade
Disclosure: Vendor Verified


Upgrade to version 1.2.35,,, 1.6.19 or higher, as it has been reported to fix this vulnerability. In addition, Digium has released a patch for some older versions.


Digium, Inc.
1.2.35 (not affected)
1.4.x (not affected)
1.6.0.x (not affected)
1.6.1.x (not affected)



  • Patrik Karlsson - patrikcqure.net - cqure.net

CVSSv2 Score

CVSSv2 Base Score = 5.0
Source: nvd.nist.gov | Generated: 2009-11-11 | Disagree?

Access_vector_2 Access_complexity_2 Authentication_2 Confidentiality_impact_1 Integrity_impact_0 Availability_impact_0


No Comments.

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