Experts warn of RCE flaw in Imunify360 security platform

A flaw in CloudLinux’s Imunify360 security product could have been exploited by an attacker for remote code execution.

Cisco’s Talos researchers discovered a remote code execution vulnerability, tracked as CVE-2021-21956, in CloudLinux’s Imunify360 security product.

Imunify360 is a security platform for web-hosting servers that allows to implement real-time protection for website and web servers.

The flaw resides in the Ai-Bolit functionality of CloudLinux Inc Imunify360 and an attacker could exploit it to execute arbitrary code using specially crafted files.

“TALOS-2021-1383 (CVE-2021-21956) could be triggered automatically just after the attacker creates a malicious file in the system if Immunify is configured with real-time file system scanning. It could also be triggered if the user scans a malicious file provided by the attacker with Ai-Bolit scanner. The attacker could cause a deserialization condition with controllable data and then execute arbitrary code.” reads the post published by Talos researchers.

The vulnerability affects the following versions of the AI-Bolit product:

30.8.8-1
30.8.9-1
30.10.3-1
31.0.3-1
31.1.1-1

The version of AI-Bolit 31.1.2-1 that comes with the ImunifyAV/Imunify360 5.11.3 has addressed the issue.

To check the version of the installs, users can access to Imunify360 agent features from command-line interface (CLI), and run the following command:

imunify360-agent version

Cisco released the SNORTⓇ rules 58252 and 58253 to detect exploitation attempts against this vulnerability.

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Pierluigi Paganini

(SecurityAffairs – hacking, RCE)

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Pierluigi Paganini

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer. Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US. Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.