Fresh Email Script
The GET variable tmp_sid has been set to http://site[dot]com/some_inexistent_file_with_long_name. It is possible for a remote attacker to include a file from local or remote resources and or execute arbitrary script code with the privileges of the web server. By injecting a custom HTTP header or by injecting a META tag, it is possible to alter the cookies stored in the browser. Attackers will normally manipulate cookie values to fraudulently authenticate themselves on a web site. By exploiting this vulnerability, an attacker may conduct a session fixation attack. In a session fixation attack, the attacker fixes the user's session ID before the user even logs into the target server, thereby eliminating the need to obtain the user's session ID afterwards.