PopnupBlog index.php multiple variables XSS

Monday, August 25, 2008
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PopnupBlog index.php multiple variables XSS
Vendor url:http://www.bluemooninc.biz/
Advisore:http://lostmon.blogspot.com/2008/08/
popnupblog-indexphp-multiple-variables.html
Vendor notify:no exploits availables:yes
##########################################

PopnupBlog contains a flaw that allows a remote
cross site scripting attack.This flaw exists because
the application does not validate 'param' , 'cat_id' and
'view' variables upon submission to 'index.php' script.
This could allow a user to create a specially crafted URL
that would execute arbitrary code in a user's browser within
the trust relationship between the browser and the server,
leading loss ofintegrity.

##########
versions
##########

PopnupBlog 3.20 code name: Denali

Prior versions can be vulnerables too.
it affects This type CMS Systems if we
have instaled this module:

Xoops
e-xoops
ImpressCMS
Bcoos

and other that uses xoops code and this module.

############
Solution
############

No solution at this time !!!

But you can edit the source code and ix it like:

for fix 'param' open index.php and arround line 37 we have

[code]
$params = PopnupBlogUtils::getDateFromHttpParams();
$start = PopnupBlogUtils::getStartFromHttpParams();
$view = $BlogCNF['default_view'];
$select_uid = isset($_GET['uid']) ? intval($_GET['uid']) : 0;
[/code]

add a line to force 'param' to return a integer:

[code]
$_GET['param'] = intval($_GET['param']);
$params = PopnupBlogUtils::getDateFromHttpParams();
$start = PopnupBlogUtils::getStartFromHttpParams();
$view = $BlogCNF['default_view'];
$select_uid = isset($_GET['uid']) ? intval($_GET['uid']) : 0;
[/code]

for fix 'cat_id' and 'view' open index.php and arround line 129 :

[code]
$xoopsTpl->assign('popimg',PopnupBlogUtils::mail_popimg()); // get email
$cat_id=0;
if (isset($_GET['cat_id'])) $cat_id = $_GET['cat_id'];
if (isset($_POST['cat_id'])) $cat_id = $_POST['cat_id'];
$xoopsTpl->assign('popnupblog', PopnupBlogUtils::get_blog_list($start,$cat_id,$select_uid));
if (isset($_GET['view'])) $view = $_GET['view'];
if (isset($_POST['view'])) $view = $_POST['view'];
[/code]

add intval to force variables to return an integer like:

[code]
$xoopsTpl->assign('popimg',PopnupBlogUtils::mail_popimg()); // get email
$cat_id=0;
if (isset($_GET['cat_id'])) $cat_id = intval($_GET['cat_id']);
if (isset($_POST['cat_id'])) $cat_id = intval($_POST['cat_id']);
$xoopsTpl->assign('popnupblog', PopnupBlogUtils::get_blog_list($start,$cat_id,$select_uid));
if (isset($_GET['view'])) $view = intval($_GET['view']);
if (isset($_POST['view'])) $view = intval($_POST['view']);
[/code]

###########
Examples
###########

http://localhost/modules/popnupblog/index.php?param=1
">[XSS-CODE]&start=0,10&cat_id=&view=1

http://localhost/modules/popnupblog/index.php?param=
&start=0,10&cat_id=">[XSS-CODE]&view=1

http://localhost/modules/popnupblog/index.php?param=
&start=0,10&cat_id=&view=1">[XSS-CODE]


############## €nd ###################

Thnx To estrella to be my light
Thnx to all Lostmon Team !
thnx to imydes From www.imydes.com
--
atentamente:
Lostmon (lostmon@gmail.com)
Web-Blog: http://lostmon.blogspot.com/
Google group: http://groups.google.com/group/lostmon (new)
--
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