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phpBB 2.0.6d && Earlier Security Issues



phpBB 2.0.6d && Earlier Security Issues



Vendor  : phpBB Group

URL     : http://www.phpbb.com 

Version : phpBB 2.0.6d && Earlier

Risk    : Cross Site Scripting







Description:

phpBB is a high powered, fully scalable, and highly customisable open-source 

bulletin board package. phpBB has a user-friendly interface, simple and straight 

forward 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.







Problem:

phpBB is a great forum system used by many millions of people. It is one of 

the more secure of the forum systems, but has a few issues still present; both 

of which allow for XSS (Cross Site Scripting). This problem presents itself in 

two different places.One of these places is viewtopic.php and the other is 

viewforum.php Below are examples along with a brief explanation on how to 

replicate this issue.



viewforum.php?f=[FNUM]&topicdays=[DNUM][XSS]



FNUM is a valid forum number. DNUM is the number of days to check. If you get no 

results with the number 1 for example try  the number 99 and so forth and so on. 

XSS is whatever code is injected.



viewtopic.php?t=[TNUM]&postdays=[DNUM][XSS]



This is nearly the same issue as above, it just happens to be present in multiple 

files. The only difference is TNUM is a valid topic id number. Remember, the query 

must display results in order for the XSS to take place. Additionally the offset 

(start) variable may be used to get results, but in most cases is unnecessary. 

Examples are below though.







Examples:

viewforum.php?f=1&topicdays=99"><script>alert(document.cookie)</script>&start=30

viewtopic.php?t=10&postdays=99"><script>alert(document.cookie)</script>&start=20







Solution:

I have released a fix for this vulnerability. It requires a valid integer for the

affected variables, and thus eliminates this vulnerability from taking place. You

can find the fix by following the link below.



http://www.gulftech.org/vuln/phpBB2.0.6dfix.rar 



Alternatively you can do it yourself by following the instructions listed below.





-----[ OPEN ]-----------------------------------



viewforum.php



-----[ FIND ]-----------------------------------



if ( !empty($HTTP_POST_VARS['topicdays']) || !empty($HTTP_GET_VARS['topicdays']) )

{

	$topic_days = ( !empty($HTTP_POST_VARS['topicdays']) ) ? $HTTP_POST_VARS['topicdays'] : $HTTP_GET_VARS['topicdays'];

	$min_topic_time = time() - ($topic_days * 86400);



-----[ REPLACE WITH ]---------------------------



if ( !empty($HTTP_POST_VARS['topicdays']) || !empty($HTTP_GET_VARS['topicdays']) )

{



///////////////////////////////////////////////////////////////////

// Lets Do Away With These Problems By Requiring A Valid Integer //

// Fix By JeiAr // http://www.gulftech.org // Friday 03 12, 2004 // 

///////////////////////////////////////////////////////////////////

	

	$topic_days = ( !empty($HTTP_POST_VARS['topicdays']) ) ? intval($HTTP_POST_VARS['topicdays']) : intval($HTTP_GET_VARS['topicdays']);

	$min_topic_time = time() - ($topic_days * 86400);











-----[ OPEN ]-----------------------------------



viewtopic.php



-----[ FIND ]-----------------------------------



if( !empty($HTTP_POST_VARS['postdays']) || !empty($HTTP_GET_VARS['postdays']) )

{

	$post_days = ( !empty($HTTP_POST_VARS['postdays']) ) ? $HTTP_POST_VARS['postdays'] : $HTTP_GET_VARS['postdays'];

	$min_post_time = time() - (intval($post_days) * 86400);



-----[ REPLACE WITH ]---------------------------



if( !empty($HTTP_POST_VARS['postdays']) || !empty($HTTP_GET_VARS['postdays']) )

{



///////////////////////////////////////////////////////////////////

// Lets Do Away With These Problems By Requiring A Valid Integer //

// Fix By JeiAr // http://www.gulftech.org // Friday 03 12, 2004 // 

///////////////////////////////////////////////////////////////////

	

	$post_days = ( !empty($HTTP_POST_VARS['postdays']) ) ? intval($HTTP_POST_VARS['postdays']) : intval($HTTP_GET_VARS['postdays']);

	$min_post_time = time() - (intval($post_days) * 86400);











phpBB development team will be releasing an official fix soon. Please check their 

website, or the SourceForge projects page of phpBB for any updates. The SourceForge 

projects page for phpBB can be located @ http://sourceforge.net/projects/phpbb The 

fix supplied here should suffice though. If you feel this is incorrect please contact 

me with details of any problems you experience. And a big thanks to Meik Sievertsen 

and the rest of the phpBB team for addressing these issues in a very prompt and 

professional manner. Original advisory located @ http://www.gulftech.org/03122004.php 







Credits:

Credits go to JeiAr of the GulfTech Security Research Team. 

http://www.gulftech.org 


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