I’m Matt Dunn, lead penetration tester at Raxis.This is a summary of the first stored cross-site scripting vulnerability I discovered while testing several Zoho-owned ManageEngine products. This vulnerability exists in the AD Self Service Plus Version 6.1.
Summary
Recently I discovered a stored cross-site scripting (XSS) vulnerability in the Zoho-owned ManageEngine AD Self Service Plus for Version 6.1 (CVE-2021-27956). The vulnerability exists in the email field of search results on the page: /webclient/index.html#/directory-search. After searching for a user, if the “More” tab is clicked, the email field is loaded with unescaped content, allowing for malicious JavaScript to be reflected back to users.
Proof of Concept
The vulnerability can be triggered by inserting HTML content, in this case script tags, into the email field of an Active Directory user. The following was inserted as a proof of concept to reflect the user’s cookie in an alert box:
<script>alert(document.cookie)</script>An example of this on one such user is shown here:
After searching for that user, the HTML is then presented unescaped on the web page, which allows the script tags to be loaded as valid JavaScript. The unescaped HTML as loaded is shown here:
After loading the search page, clicking the “More” tab triggers the vulnerability, which is shown in Figure 3:
Affected Versions
Raxis discovered this vulnerability on ManageEngine AD Self Service Plus 6.1, build 6100.
Remediation
Upgrade ManageEngine AD Self Service Plus to Build Version 6104 immediately. The ServicePack can be found here with release notes here.
Disclosure Timeline
- February 19, 2021 – Vulnerability reported to Zoho
- February 19, 2021 – Zoho begins investigation into report
- March 5, 2021 – CVE-2021-27956 assigned to this vulnerability
- May 8, 2021 – Zoho releases patch for this vulnerability
