Vulnerability identifier: #VU56257

Vulnerability risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-37421

CWE-ID: CWE-285

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Zoho ManageEngine ADSelfService Plus
Client/Desktop applications / Software for system administration

Vendor: Zoho Corporation

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to an error when handling the X-Forwarded-For HTTP header information while accessing the admin portal, if access restrictions are based on IP addresses. A remote attacker can pass an IP address from the whitelist via the X-Forwarded-For HTTP header while accessing the web interface from another IP address, bypass IP-based access restrictions and gain unauthorized access to the admin web interface.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Zoho ManageEngine ADSelfService Plus: 6000 - 6103

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External links
http://blog.stmcyber.com/vulns/cve-2021-37421/
http://pitstop.manageengine.com/portal/en/community/topic/adselfservice-plus-6104-released-with-an-important-security-fixes

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.