#VU86573 Embedded malicious code (backdoor) in Endpoint Manager - CVE-2021-44529

Vulnerability identifier: #VU86573

Vulnerability risk: Critical

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red]

CVE-ID: CVE-2021-44529

CWE-ID: CWE-506

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Endpoint Manager
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Ivanti

Description

The vulnerability allows a remote attacker to gain unauthorized access to the application.

The vulnerability exists due to presence of embedded malicious functionality in the application code (aka backdoor) within the "/opt/landesk/broker/webroot/lib/csrf-magic.php" file. A remote non-authenticated attacker can set specially crafted cookies and gain unauthorized access to the application.

Note, the vulnerability patched in 2021 by Ivanti is considered a backdoor.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Endpoint Manager: before 4.6

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External links
https://forums.ivanti.com/s/article/SA-2021-12-02
https://packetstormsecurity.com/files/166383/Ivanti-Endpoint-Manager-CSA-4.5-4.6-Remote-Code-Execution.html
https://packetstormsecurity.com/files/170590/Ivanti-Cloud-Services-Appliance-CSA-Command-Injection.html
https://www.labs.greynoise.io/grimoire/2024-02-what-is-this-old-ivanti-exploit/index.html
https://attackerkb.com/topics/XTKrwlZd7p/cve-2021-44529

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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?

Yes. This vulnerability is being exploited in the wild.