Concrete5 <= 5.7.3.1 Multiple Reflected Cross-Site Scripting Vulnerabilities

• Software Link:

https://www.concrete5.org/

• Affected Versions:

Version 5.7.3.1 and probably other versions.

• Vulnerabilities Description:

1) The vulnerable code is located in /concrete/views/panels/details/page/versions.php:

<? foreach($_REQUEST['cvID'] as $cvID) {
	$tabs[] = array('view-version-' . $cvID, t('Version %s', $cvID), $checked);
	$checked = false;
} 
print $ih->tabs($tabs);			
foreach($_REQUEST['cvID'] as $cvID) { ?>

	<div id="ccm-tab-content-view-version-<?=$cvID?>" style="display: <?=$display?>; height: 100%">
	<iframe border="0" id="v<?=time()?>" frameborder="0" height="100%" width="100%" src="<?=REL_DIR_FILES_TOOLS_REQUIRED?>/pages/preview_version?cvID=<?=$cvID?>&amp;cID=<?=$_REQUEST['cID']?>" />

User input passed through the “cvID” and “cID” request parameters is not properly sanitized before being used to generate HTML output at lines 6 and 13. This can be exploited to conduct reflected Cross-Site Scripting (XSS) attacks.

2) The vulnerable code is located in /concrete/src/Form/Service/Widget/UserSelector.php:

	public function selectUser($fieldName, $uID = false, $javascriptFunc = 'ccm_triggerSelectUser') {
		$selectedUID = 0;
		if (isset($_REQUEST[$fieldName])) {
			$selectedUID = $_REQUEST[$fieldName];
		} else if ($uID > 0) {
			$selectedUID = $uID;
		}

		$html = '';
		$html .= '
';
		if ($selectedUID > 0) {
			$ui = UserInfo::getByID($selectedUID);
			$html .= $ui->getUserName();
		}
		$html .= '
';
        $identifier = new \Concrete\Core\Utility\Service\Identifier();
        $selector = $identifier->getString(32);
		$html .= '' . t('Select User') . '';
		$html .= '';
		$html .= '
';

User input passed through the “uID” request parameter is not properly sanitized before being used to generate HTML output at line 35. This can be exploited to conduct reflected Cross-Site Scripting (XSS) attacks.

3) The vulnerable code is located in /concrete/elements/group/search.php:

$searchRequest = $_REQUEST;
$result = Loader::helper('json')->encode($controller->getSearchResultObject()->getJSONObject());
$tree = GroupTree::get();
$guestGroupNode = GroupTreeNode::getTreeNodeByGroupID(GUEST_GROUP_ID);
$registeredGroupNode = GroupTreeNode::getTreeNodeByGroupID(REGISTERED_GROUP_ID);
?>

<style type="text/css">
	div[data-search=groups] form.ccm-search-fields {
		margin-left: 0px !important;
	}
</style>

<div data-search="groups">
<script type="text/template" data-template="search-form">
<form role="form" data-search-form="groups" action="<?=URL::to('/ccm/system/search/groups/submit')?>" class="form-inline ccm-search-fields ccm-search-fields-none">
	<input type="hidden" name="filter" value="<?php echo $searchRequest['filter']?>" />

User input passed through the “filter” request parameter is not properly sanitized before being used to generate HTML output at line 20. This can be exploited to conduct reflected Cross-Site Scripting (XSS) attacks.

4) User input passed through the “msCountry” POST parameter to /index.php/dashboard/system/multilingual/setup/load_icon is not properly sanitized before being used to generate HTML output. This can be exploited to conduct reflected Cross-Site Scripting (XSS) attacks.

5) User input passed through the “pageURL” POST parameter to /index.php/dashboard/pages/single is not properly sanitized before being used to generate HTML output. This can be exploited to conduct reflected Cross-Site Scripting (XSS) attacks.

6) The vulnerable code is located in /concrete/attributes/select/form.php:

		$vals = $this->post('atSelectNewOption');
		if (is_array($vals)) {
			foreach($vals as $v) { ?>
				<div class="newAttrValue">
					<?=$form->hidden($this->field('atSelectNewOption') . '[]', $v)?>
					<span class="badge"><?php echo $v?></span>

User input passed through the “atSelectNewOption” POST parameter is not properly sanitized before being used to generate HTML output at line 60. This can be exploited to conduct reflected Cross-Site Scripting (XSS) attacks.

• Solution:

Update to version 5.7.4 or later.

• Disclosure Timeline:

[05/05/2015] – Vulnerabilities details sent through HackerOne
[05/05/2015] – Vendor said that two vulnerabilities were already fixed in development
[07/05/2015] – Version 5.7.4 released along with the patch for these vulnerabilities
[06/06/2015] – Vulnerabilities publicly disclosed on HackerOne
[11/06/2015] – CVE number requested
[11/06/2015] – Publication of this advisory
[23/06/2015] – CVE number assigned

• CVE Reference:

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2015-4721 to these vulnerabilities.

• Credits:

Vulnerabilities discovered by Egidio Romano of Minded Security.

• Other References:

https://www.mindedsecurity.com/index.php/research/advisories/msa110615-2
https://hackerone.com/reports/59661