CVE-2009-4444— Microsoft IIS畸形文件扩展名绕过安全限制漏洞

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Microsoft Internet Information Services (IIS) 5.x and 6.x uses only the portion of a filename before a ; (semicolon) character to determine the file extension, which allows remote attackers to bypass intended extension restrictions of third-party upload applications via a filename with a (1) .asp, (2) .cer, or (3) .asa first extension, followed by a semicolon and a safe extension, as demonstrated by the use of asp.dll to handle a .asp;.jpg file.

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Microsoft IIS畸形文件扩展名绕过安全限制漏洞

Microsoft Internet信息服务(IIS)是Microsoft Windows自带的一个网络信息服务器，其中包含HTTP服务功能。 IIS服务器错误的执行了带有多个扩展名的文件中所包含的ASP代码。例如，malicious.asp;.jpg被执行为了ASP文件。很多文件上传程序仅检查文件扩展名的最后部分，因此这可能导致绕过保护机制向服务器上传恶意可执行文件。

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