Description - Multiple Vulnerabilities in phphg Guestbook

Multiple Vulnerabilities found in phphg Guestbook script.

Exploit

Available

Solution

Available

1. Authentication Bypass
Vulnerable script: check.php

There are two ways to bypass authentication:

a) SQL Injection
Variable $HTTP_POST_VARS[username] isn't properly sanitized before being used in a SQL query. This can be used to make any SQL query by injecting arbitrary SQL code.
Condition: magic_quotes_gpc - off

b) Cookie based authentication
check.php script dont make password comparisson when identifying user by cookies


2. Multiple Cross-Site Scripting
Vulnerable script: signed.php
Variables $HTTP_POST_VARS[location] $HTTP_POST_VARS[website] $HTTP_POST_VARS[message] are not properly sanitized. This can be used to post arbitrary html or script code.


3. SQL Injections in administrator control panel
Vulnerable scripts:
admin/edit_smilie.php
admin/add_theme.php
admin/ban_ip.php
admin/add_lang
admin/edit_filter

Variable $HTTP_GET_VARS[id] variable isn't properly sanitized. This can be used to make any SQL query by injecting arbitrary SQL code.
Condition: magic_quotes_gpc - off