Remote code execution in Cleo products

1) Arbitrary file upload

EUVDB-ID: #VU101393

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-2024-55956

CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file during file upload. A remote attacker can upload a malicious file and execute it on the server.

Note, the vulnerability is being actively exploited in the wild.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cleo Harmony: 5.6 - 5.8.0.23

Cleo VLTrader: 5.6 - 5.8.0.23

Cleo LexiCom: 5.6 - 5.8.0.23

CPE2.3

• cpe:2.3:a:cleo:cleo_harmony:5.6:*:*:*:*:*:*:*
• cpe:2.3:a:cleo:cleo_harmony:5.6.1:*:*:*:*:*:*:*
• cpe:2.3:a:cleo:cleo_harmony:5.6.2:*:*:*:*:*:*:*
• cpe:2.3:a:cleo:cleo_vltrader:5.6:*:*:*:*:*:*:*
• cpe:2.3:a:cleo:cleo_vltrader:5.6.1:*:*:*:*:*:*:*
• cpe:2.3:a:cleo:cleo_vltrader:5.6.2:*:*:*:*:*:*:*
• cpe:2.3:a:cleo:cleo_lexicom:5.6:*:*:*:*:*:*:*
• cpe:2.3:a:cleo:cleo_lexicom:5.6.1:*:*:*:*:*:*:*
• cpe:2.3:a:cleo:cleo_lexicom:5.6.2:*:*:*:*:*:*:*

External links

https://support.cleo.com/hc/en-us/articles/28408134019735-Cleo-Product-Security-Advisory-CVE-Pending
https://www.huntress.com/blog/threat-advisory-oh-no-cleo-cleo-software-actively-being-exploited-in-the-wild

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.