Title: DCForum 'AZ' Field Remote Command Execution Vulnerability
Severity: HIGH
Description:
DCForum is a commercial cgi script from DCScripts which is designed to facilitate web-based threaded discussion forums.
All versions of DCForum are vulnerable to remote execution of arbitrary commands.
DCForum fails to properly validate user-supplied input to the script. By inserting shell commands into specific fields included in submitted querystrings, an attacker can cause the script to open and parse commands stored in an external file on the target host.
By supplying the 'az' field with a long path (i.e. including '/../' sequences) an attacker can force the script to parse such a file from arbitrary locations in the filesystem. Valid perl instrutions contained in this file will be executed with the privilege level of the webserver user - usually 'nobody'.
Affected Products:
- DC Scripts DCForum 1.0.0
- DC Scripts DCForum 2.0.0
- DC Scripts DCForum 2000 1.0.0
- DC Scripts DCForum 3.0.0
- DC Scripts DCForum 4.0.0
- DC Scripts DCForum 5.0.0
- DC Scripts DCForum 6.0.0
References:
- DCScripts: DC Scripts Security Bulletin
- DCScripts: DCScripts DCForum webpage
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