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Asterisk Peer Multiple Vulnerabilities (AST-2012-014 / AST-2012-015)

High

Synopsis

The remote VoIP server is affected by multiple vulnerabilities.

Description

According to the version in its SIP banner, the version of Asterisk running on the remote host is potentially affected by the following vulnerabilities :

- A stack-based buffer overflow error exists related to SIP, HTTP and XMPP handling over TCP. Note that in the case of 'Certified Asterisk', SIP is not affected. Further note that in the case of XMPP, an attacker must establish an authenticated session first. (CVE-2012-5976)

- An error exists related to device state cache and anonymous calls that could allow system resources to be exhausted. Note this vulnerability only affects systems configured to allow anonymous calls. (CVE-2012-5977)

Solution

Upgrade to Asterisk 1.8.19.1 / 10.11.1 / 11.1.2, Certified Asterisk 1.8.11-cert10 or apply the patches listed in the Asterisk advisory