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VID 21187
Severity 30
Port 80, ...
Protocol TCP
Class CGI
Detailed Description The file viewcode.asp is a default IIS files which can give a malicious user a lot of unnecessary information about your file system or source files. Specifically, viewcode.asp can allow a remote user to potentially read any file on a webserver hard drive.

Example,
http://target/pathto/viewcode.asp?source=../../../../../../autoexec.bat

* References:
http://www.microsoft.com/technet/security/bulletin/ms99-013.asp
Recommendation If you do not need these files, then delete them, otherwise use suitable access control lists to ensure that the files are not world-readable.
Related URL CVE-1999-0737 (CVE)
Related URL (SecurityFocus)
Related URL 2382 (ISS)