![]() Huntress says companies with servers that have already been compromised should restore their systems from a backup created prior to Dec. Cybersecurity and Infrastructure Security Agency (CISA), along with the Coast Guard Cyber Command (CGCYBER), on Thursday released a joint advisory warning of continued attempts on the part of threat actors to exploit the Log4Shell flaw in VMware Horizon servers to breach target networks. VMware has advised Horizon users to update to new versions of the software with patches for the Log4Shell vulnerabilities. Huntress says "that ~34% of the 180 Horizon servers (62) we analyzed were unpatched and internet-facing at the time of this publication." It also notes that the Shodan search tool lists roughly 25,000 internet-facing Horizon servers. Plenty of people will have some pondering to do. Successful exploitation of this issue may allow unprivileged users to escalate their privileges to root on the Mac OSX system where the client is installed. If you have VMWare Horizon in your organization, this message may be very important for you to secure your IT infrastructure. "For those of you just learning about the mass exploitation of VMware Horizon servers and the installation of backdoor web shells," Huntress says, "you should seriously consider the possibility that your server is compromised if it was unpatched and internet-facing." VMware Horizon View Client (2.x, 3.x and 4.x prior to 4.5.0) contains a command injection vulnerability in the service startup script. The former can offer attackers initial access to a network the latter can help them maintain that access so they can gather more information, compromise additional machines, and potentially evade detection. Others, including The DFIR Report and Red Canary, reported similar activity that day.Įxploiting the Log4Shell vulnerabilities to deploy Cobalt Strike makes sense. Huntress says companies with servers that have already been compromised. Huntress says that "an unrelated Managed Antivirus detection (Microsoft Defender) tipped our ThreatOps team to new exploitation of the Log4Shell vulnerability in VMware Horizon" on Jan. (Jaiz Anuar / Getty Images) Huntress reports that attackers have started to exploit the Log4Shell vulnerabilities revealed in December 2021 on servers running VMware Horizon to deploy. VMware has advised Horizon users to update to new versions of the software with patches for the Log4Shell vulnerabilities. Security firm SentinelOne has dubbed the group TunnelVision. ![]() (Among other things.) But hackers often use cracked versions of the software to conduct attacks, too. Enlarge (credit: Getty Images) Hackers aligned with the government of Iran are exploiting the critical Log4j vulnerability to infect unpatched VMware users with ransomware, researchers said on Thursday. Best Hosted Endpoint Protection and Security SoftwareĬobalt Strike, meanwhile, is a command and control framework security professionals use to assess an organization's ability to respond to malicious activity on its network. An initial access broker group tracked as Prophet Spider has been linked to a set of malicious activities that exploits the Log4Shell vulnerability in unpatched VMware Horizon Servers. ![]()
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