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 126.96.36.199 and 1.8.x prior to 188.8.131.52.
Solution: Update to versions 184.108.40.206 and 220.127.116.11 or apply patches. Follow the vendor's instructions to prevent exploitation of weakness #1.
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
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Subject: Asterisk Enumeration Weakness and Denial of Service Vulnerability
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