![]() ![]() Change user behaviorĮncourage duplex, discourage email printing and be friendly to the environment. See how many pages are being printed by who, what and when. When an Organization can easily answer Who, What, When, Where, Why and How they're printing behavior affects the bottom line they are finally managing with the facts. We can expect other attackers to make use of the published information and PoC to mount successful attacks.For NHSTE discounted pricing, please see contact info at the bottom. ![]() On Monday, Horizon3.ai published a post detailling their analysis of the advisory and patch, as well as how they built a proof-of-concept exploit (PoC) for CVE-2023-27350. ![]() They have shared indicators of compromise admins can use to determine if attackers have breached their servers and installed malware on them, as well as risk mitigation advice. Potentially, the access gained through PaperCut exploitation could be used as a foothold leading to follow-on movement within the victim network, and ultimately ransomware deployment.” “While the ultimate goal of the current activity leveraging PaperCut’s software is unknown, these links (albeit somewhat circumstantial) to a known ransomware entity are concerning. In the previous Truebot investigation, TA505 later claimed responsibility for using exploitation of GoAnywhere software as a precursor to ransomware,” the researchers noted. “Truebot is linked to an entity known as Silence, which in turn has historical links with the ransomware-related entity TA505 (or Clop). Huntress researchers have shared on Friday that there are some 1,800 publicly exposed PaperCut servers that can be reached via port 9191, and that vulnerable servers are being exploited and have Atera and/or Syncro remote management and maintenance software installed on them, allowing attackers to achieve persistent remote access and code execution capabilities.Īnother file that gets downloaded is a variant of the Truebot malware. “If you suspect that your server has been compromised, we recommend taking server backups, then wiping the Application Server, and rebuilding the Application Server and restoring the database from a ‘safe’ backup point prior to when you discovered any suspicious behavior.” A PoC for CVE-2023-27350 is available In addition to our email and in-app announcements to all customers, we’ve been using this list to proactively reach out to potentially exposed customers via multiple means,” the company said. “The security response team at PaperCut has been working with external security advisors to compile a list of unpatched PaperCut MF/NG servers that have ports open on the public internet. If updating is impossible, they should lock down network access to the servers by blocking all inbound traffic from external IPs to the web management port (port 91 by default). Users are advised to upgrade all Application Servers and Site Servers to PaperCut MF and NG versions 20.1.7, 21.2.11 or 22.0.9, which include a fix for both vulnerabilities. PaperCut says CVE-2023-27350 is being exploited but that they currently have no evidence that CVE-2023-27351 is.ĬVE-2023-27350 affects PaperCut MF or NG version 8.0 or later (on all OS platforms) CVE-2023–27351 affects PaperCut MF or NG version 15.0 or later (on all OS platforms).
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