CVE-2022-26842
A reflected cross-site scripting (xss) vulnerability exists in the charts tab selection functionality of WWBN AVideo 11.6 and dev master commit 3f7c0364. A specially-crafted HTTP request can lead to arbitrary Javascript execution. An attacker can get an authenticated user to send a crafted HTTP request to trigger this vulnerability.
The versions below were either tested or verified to be vulnerable by Talos or confirmed to be vulnerable by the vendor.
WWBN AVideo 11.6
WWBN AVideo dev master commit 3f7c0364
AVideo - https://github.com/WWBN/AVideo
9.6 - CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CWE-79 - Improper Neutralization of Input During Web Page Generation (‘Cross-site Scripting’)
AVideo is a web application, mostly written in PHP, that can be used to create an audio/video sharing website. It allows users to import videos from various sources, encode and share them in various ways. Users can sign up to the website in order to share videos, while viewers have anonymous access to the publicly-available contents. The platform provides plugins for features like live streaming, skins, YouTube uploads and more.
The PHP file view/charts.php is a dashboard that shows several charts about the videos published for the current logged-in user.
...
<body class="<?php echo $global['bodyClass']; ?>">
<?php
include $global['systemRootPath'] . 'view/include/navbar.php';
include $global['systemRootPath'] . 'view/charts_body.php'; // [1]
include_once $global['systemRootPath'] . 'view/include/footer.php';
?>
</body>
...
charts.php includes view/charts_body.php [1] which shows the body of the page:
...
<ul class="nav nav-tabs"> // [2]
<li class="active"><a data-toggle="tab" href="#dashboard"><i class="fas fa-tachometer-alt"></i> <?php echo __("Dashboard"); ?></a></li>
<li><a data-toggle="tab" id="viewmyVideosReport" href="#myVideosReport"><i class="fas fa-play-circle"></i> <?php echo __("My Videos"); ?></a></li>
<li><a data-toggle="tab" id="viewperchannel" href="#menu1"><i class="fas fa-play-circle"></i> <i class="fa fa-eye"></i> <?php echo __("Video views - per Channel"); ?></a></li>
<li><a data-toggle="tab" id="commentthumbs" href="#menu2"><i class="fa fa-comments"></i> <i class="fa fa-thumbs-up"></i> <?php echo __("Comment thumbs up - per Person"); ?></a></li>
<li><a data-toggle="tab" id="videothumbs" href="#menu3"><i class="fas fa-play-circle"></i> <i class="fa fa-thumbs-up"></i> <?php echo __("Video thumbs up - per Channel"); ?></a></li>
<?php echo AVideoPlugin::getChartTabs(); ?>
</ul>
...
<script type="text/javascript">
$(document).ready(function () { // [3]
<?php if (!empty($_GET['jump'])) { ?>
$('#<?php echo $_GET['jump']; ?>').click();
<?php } ?>
});
</script>
The page has a navigation bar shown as tabs [2], and it also has a Javascript function that is used to select a specific tab at page load, depending on the value of the jump GET parameter. It’s supposed to be used with a request like https://192.168.200/view/charts.php?jump=commentthumbs for selecting the comments tab.
The jump parameter is however not sanitized, leading to a straightforward reflected cross-site scripting issue (XSS). This can be used by an attacker, in the worst case, to take over an administrator account, for example by tricking an administrator into clicking on a link that triggers the XSS.
The XSS can be triggered with a request like https://192.168.200/view/charts.php?jump=x%27);alert(1);//. It must be performed as a logged-in user.
Vendor confirms issues fixed on July 7th 2022
2022-07-05 - Vendor Disclosure
2022-07-07 - Vendor Patch Release
2022-08-16 - Public Release
Discovered by Claudio Bozzato of Cisco Talos.