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MSO.DLL in Microsoft Office 2000, Office XP (2002), and Office 2003 allows user-assisted attackers to cause a denial of service and execute arbitrary code via multiple attack vectors, as originally demonstrated using a crafted document record with a malformed string, as demonstrated by replacing a certain "01 00 00 00" byte sequence with an "FF FF FF FF" byte sequence, possibly causing an invalid array index, in (1) an Excel .xls document, which triggers an access violation in ole32.dll; (2) an Excel .xlw document, which triggers an access violation in excel.exe; (3) a Word document, which triggers an access violation in mso.dll in winword.exe; and (4) a PowerPoint document, which triggers an access violation in powerpnt.txt. NOTE: after the initial disclosure, this issue was demonstrated by triggering an integer overflow using an inconsistent size for a Unicode "Sheet Name" string.

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Microsoft Office畸形字符串解析整数溢出漏洞

Microsoft Office是非常流行的办公软件套件。 Office所使用的一个共享库mso.dll存在内存破坏漏洞，远程攻击者可能利用此漏洞在用户机器上执行任意指令。 如果用户受骗打开了恶意的Office文档的话，就会触发数组索引边界错误，导致拒绝服务或执行任意指令。例如，攻击者可以创建特制的Excel 2003文件并将Unicode "Sheet Name"字符串的大小改为错误的值，这样就可以导致整数溢出。

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