Experts warn of critical RCE in ConnectWise Server Backup Solution

ConnectWise has addressed a critical remote code execution vulnerability impacting Recover and R1Soft Server Backup Manager (SBM).

According to the advisory published by ConnectWise, the vulnerability is an Improper Neutralization of Special Elements in Output Used by a Downstream Component.

An attacker can exploit the vulnerability to execute remote code or directly access confidential data.

The vulnerability impacts ConnectWise Recover v2.9.7 and earlier versions and R1Soft SBM v6.16.3 and earlier versions.

Huntress researchers explained that the authentication bypass and sensitive file leak (CVE-2022-36537) affect the Java framework “ZK” Ajax web application framework used within the ConnectWise R1Soft software Server Backup Manager SE.

The experts published a video PoC that demonstrates the exploitation of the issue to 1) bypass authentication, 2) upload a backdoored JDBC database driver to gain code execution, and 3) use the REST API to trigger commands to registered agents to ultimately push the recently leaked Lockbit 3.0 ransomware to all downstream endpoints.

The good news is that the company is not aware of active exploitation of the vulnerability in the wild.

“It is important to note that the upstream ZK vulnerability not only affects R1Soft, but also any application utilizing an unpatched version of the ZK framework. The access an attacker can gain by using this authentication bypass vulnerability is specific to the application being exploited, however there is serious potential for other applications to be affected in a similar way to R1Soft Server Backup Manager.” concludes the post published by Huntress. “Huntress is working closely with our DIVD partners to continue the larger hunt and help secure other ZK applications that are at risk.”

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Pierluigi Paganini

(SecurityAffairs – hacking, ConnectWise)

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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”.

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