iDefense Security Advisory 07.14.09 - Remote exploitation of a heap based buffer overflow vulnerability in Microsoft Corp.'s Embedded OpenType Font Engine (T2EMBED.DLL) could allow an attacker to execute arbitrary code with the privileges of the current user. During the processing of a malicious OpenType Font, an integer truncation issue can occur on a specific length value. This can result in a large overwrite of the heap using attacker controlled data. The attacker may gain arbitrary execution control by overwriting specific data structures on the heap, such as an object virtual function table. iDefense has confirmed the existence of this vulnerability in the Embedded OpenType Font Engine for Windows Vista SP1 (T2EMBED.DLL version 6.0.6001.18000) and Windows XP SP3 (T2EMBED.DLL version 5.1.2600.5512). Previous versions may also be affected.
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