Secunia Security Advisory – A vulnerability has been reported in haserl, which can be exploited by malicious people to manipulate critical environment variables. haserl executes shell scripts embedded in HTML documents using a cgi wrapper and sets all input parameters as environment variables. This could be exploited to cause certain programs and utilities to behave unexpectedly and potentially be exploited to execute arbitrary system commands. The vulnerability has been reported in version 0.5.1. Other versions may also be affected.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/34918/sa13031.txt
Source: https://packetstormsecurity.com/files/34918/Secunia-Security-Advisory-13031.html