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RealNetworks has patched a vulnerability in its RealPlayer and HelixPlayer software that made it possible for attackers to run arbitrary code on a victim's machine. The security hole affects applications running on Windows, Mac and Linux platforms.

The vulnerability exists within the code that handles time formats for a feature in the applications that acts as a wall clock, according to iDefense Labs, which first discovered the flaw. An attacker can exploit the vulnerability by effecting a stack-based buffer overflow that allows for the execution of malware.

RealNetworks spokesman Matt Graves said the lack of disclosure is the result of the company not knowing the iDefense advisory was going to be issued on Wednesday. The company is scrambling to add an advisory to its own website. (It is unclear if a messaging system within the applications warns users of the vulnerability.)

To exploit the flaw, an attacker would first have to prompt a user to open a specially crafted SMIL file. Simply luring a RealPlayer or HelixPlayer user to a booby-trapped website is sufficient for accomplishing this. SMIL files are written in an XML markup language that uses the Synchronized Multimedia Integration Language used to code things such as for timing, layout, animations, visual transitions, and media embedding.

The vulnerability has been confirmed in version 10 and 10.5-GOLD of RealPlayer for Windows, version 10 of RealPlayer for Mac, RealPlayer Enterprise and and HelixPlayer, an open source version of RealPlayer for Linux. Earlier versions of those programs are presumed susceptible as well, according to to iDefense. ®

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