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 188.8.131.52 and 1.8.x prior to 184.108.40.206.
Solution: Update to versions 220.127.116.11 and 18.104.22.168 or apply patches. Follow the vendor's instructions to prevent exploitation of weakness #1.
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Subject: Asterisk Enumeration Weakness and Denial of Service Vulnerability
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