Asterisk Project Security Advisory - External control protocols, such as the Asterisk Manager Interface, often have the ability to get and set channel variables; this allows the execution of dial-plan functions. Dial-plan functions within Asterisk are incredibly powerful, which is wonderful for building applications using Asterisk. But during the read or write execution, certain dial-plan functions do much more. For example, reading the SHELL() function can execute arbitrary commands on the system Asterisk is running on. Writing to the FILE() function can change any file that Asterisk has write access to. When these functions are executed from an external protocol, that execution could result in a privilege escalation.
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