textcounter.pl Arbitrary Command Execution Vulnerability

textcounter.pl Arbitrary Command Execution Vulnerability

textcounter.pl is distributed through Matt's Scripts archive, and provides added features to httpd servers such as counters, guestbooks, and http cookie management. Due to insufficient checking of entered characters, it is possible for a remote user to input custom formatted strings into the $DOCUMENT_URI environment variable which, which when parsed can be executed as the UID of the httpd process. This makes it possible for a user with malicious intentions to execute arbitrary commands, and potentially gain access to the local host.