Secunia Research has discovered a vulnerability in Microsoft Windows, which can be exploited by malicious people to compromise a user's system. The vulnerability is caused due to an integer underflow error within the "GetFontDesc()" function in usp10.dll when processing font files cmap table and can be exploited to cause a heap-based buffer overflow via a font file containing cmap table data with specially crafted offset within encoding records. Successful exploitation allows execution of arbitrary code.
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