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Moderately critical

Asterisk Enumeration Weakness and Denial of Service Vulnerability

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Release Date:  2011-12-09    Last Update:  2011-12-12    Views:  1,367

Secunia Advisory SA47059

Where:

From remote

Impact:

Exposure of system information, DoS

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


A weakness and vulnerability have been reported in Asterisk, which can be exploited by malicious people to disclose certain system information and cause a DoS (Denial of Service).

1) The weakness is caused due to Asterisk responding on different ports for certain requests, which can be exploited to e.g. enumerate SIP peers.

Successful exploitation requires that SIP endpoints with different NAT settings are used.

2) The vulnerability is caused due to a NULL pointer dereference error within the "handle_request_info()" function (channels/chan_sip.c) when the "automon" feature is enabled (disabled by default) and can be exploited to cause a crash by sending a sequence of specially crafted SIP packets.

The weakness is reported in all Asterisk versions and the vulnerability is reported in versions 1.6.2.x prior to 1.6.2.21 and 1.8.x prior to 1.8.7.2.


Solution:
Update to versions 1.6.2.21 and 1.8.7.2 or apply patches. Follow the vendor's instructions to prevent exploitation of weakness #1.

Further details available to Secunia VIM customers

Provided and/or discovered by:
The vendor credits:
1) Ben Williams
2) Kristijan Vrban

Original Advisory:
Asterisk:
http://downloads.asterisk.org/pub/security/AST-2011-013.html
http://downloads.asterisk.org/pub/security/AST-2011-014.html

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 Enumeration Weakness and Denial of Service Vulnerability

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