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source: http://www.securityfocus.com/bid/14834/info A remote command execution vulnerability affects the application. The revision control function of the TWikiUsers script uses the backtick shell metacharacter to construct a command line. An attacker may use a specially crafted URI to execute arbitrary commands through the shell. This attack would occur in the context of the vulnerable application and can facilitate unauthorized remote access. http://www.example.com/cgi-bin/view/Main/TWikiUsers?rev=2%20%7Cless%20/etc/passwd