Digium, the developers of Asterix, has released a new version of the telephone system software, which remedies two vulnerabilities in the voice mail system that could lead to a denial-of-service attack or a remote compromise.
The vulnerability is caused due to a boundary error within the IMAP-specific code for processing voice mail messages. This can be exploited to cause a buffer overflow via a specially crafted voice mail message sent as e-mail containing an overly long (more than 1,024 characters) combination of Content-Type or Content-Description headers.
A successful exploitation requires the user to listen to the voice mail message via a phone. Users retrieving their voice mail via e-mail are not affected. The above vulnerability is reported in 1.4.x versions and is fixed in the 1.4.13 update.
You can read more from the original Digium Security Advisory.
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Paul Mah is a writer and blogger who lives in Singapore, where he has worked for a number of years in various capacities within the IT industry. Paul enjoys tinkering with tech gadgets, smartphones, and networking devices.