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Asterisk Multiple Channel Drivers Denial of Service (AST-2011-008/AST-2011-009/AST-2011-010)

Medium

Synopsis

The remote VoIP server is vulnerable to multiple denial of service attacks.

Description

The version of Asterisk running on the remote host is potentially affected by multiple denial of service vulnerabilities :

- If a remote user sends a SIP packet with a null, Asterisk reads data past the null even though the buffer is actually truncated when copied, which could lead to an application crash. (AST-2011-008)

- A remote user sending a SIP packet containing a Contact header with a missing left angle bracket causes Asterisk to access a null pointer which could cause the application to crash. (AST-2011-009)

- A memory address can be inadvertently transmitted over the network via IAX2 via an option control frame which would cause the remote party to try to access it. (AST-2011-010)

Solution

Upgrade to Asterisk 1.4.41.1, 1.6.2.18.1, 1.8.4.3, Asterisk Business C.3.7.3, or later.