CISA Issues Warning on Active Exploitation of ZK Java Web Framework Vulnerability

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has additional a superior-severity flaw affecting the ZK Framework to its Regarded Exploited Vulnerabilities (KEV) catalog based on evidence of active exploitation.

Tracked as CVE-2022-36537 (CVSS score: 7.5), the issue impacts ZK Framework versions 9.6.1, 9.6..1, 9.5.1.3, 9..1.2, and 8.6.4.1, and lets risk actors to retrieve sensitive data through specially crafted requests.

“The ZK Framework is an open up resource Java framework,” CISA reported. “This vulnerability can impact multiple goods, like but not limited to ConnectWise R1Gentle Server Backup Manager.”

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The vulnerability was patched in May perhaps 2022 in variations 9.6.2, 9.6..2, 9.5.1.4, 9..1.3, and 8.6.4.2.

As shown by Huntress in a evidence-of-concept (PoC) in Oct 2022, the vulnerability can be weaponized to bypass authentication, add a backdoored JDBC database driver to achieve code execution, and deploy ransomware on vulnerable endpoints.

Singapore-based mostly Numen Cyber Labs, in addition to publishing a PoC of its very own in December 2022, cautioned that it observed additional than 4,000 Server Backup Supervisor instances uncovered on the internet.

The vulnerability has since arrive under mass exploitation, as evidenced by NCC Group’s Fox-IT investigation crew last 7 days, to receive original entry and deploy a web shell backdoor on 286 servers.

A vast majority of the infections are found in the U.S., South Korea, the U.K., Canada, Spain, Colombia, Malaysia, Italy, India, and Panama. A total of 146 R1Tender servers stay backdoored as of February 20, 2023.

“Around the course of the compromise, the adversary was able to exfiltrate VPN configuration information, IT administration details and other sensitive paperwork,” Fox-IT reported.

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