An integer overflow exists in QuickTime's handling of UDTA atoms in movie files. By enticing a user to access a maliciously-crafted movie, an attacker can trigger the overflow, which may lead to an application crash or arbitrary code execution. This update addresses the issue by performing additional validation of QuickTime movies. Credit to Sowhat of Nevis Labs, and an anonymous researcher working with TippingPoint and the Zero Day Initiative for reporting this issue.
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