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Not critical

Asterisk SIP INVITE Response User Enumeration Weakness

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Release Date:  2011-05-04    Views:  1,947

Secunia Advisory SA44452

Where:

From remote

Impact:

Exposure of system information

Solution Status:

Unpatched

Software:

CVE Reference(s):

No CVE references.

Description


A weakness has been discovered in Asterisk, which can be exploited by malicious people to determine valid usernames.

The problem is that different responses are being sent when using a valid or an invalid username in INVITE messages. This can be exploited to determine valid usernames by sending specially crafted INVITE messages.

The weakness is confirmed in version 1.8.3.3. Other versions may also be affected.


Solution:
There's currently no known effective workaround.

Provided and/or discovered by:
Francesco Tornieri

Original Advisory:
http://packetstormsecurity.org/files/view/101011/asterisk-1.8.x-sip-username-enumeration.txt

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Asterisk SIP INVITE Response User Enumeration Weakness

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