Bl00dy Ransomware Gang actively targets the education sector
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2023-27350 | Authentication Bypass Leading to SYSTEM RCE in PaperCut MF/NG PaperCut MF and PaperCut NG print management software contain an improper access control flaw (CWE-284) in the SetupCompleted class that allows an unauthenticated attacker to bypass authentication and reach internal administrative functionality. The flaw is triggered by sending crafted, unauthenticated requests to the PaperCut application's web interface, without requiring valid user credentials. A successful attacker gains the ability to execute code in the context of the SYSTEM account on the PaperCut server, typically a Windows print server, giving full control of that host. Any organization running PaperCut MF or NG is potentially affected, and exposure is highest where the server's web interface is reachable from the internet or by untrusted networks. Exploitation is confirmed in the wild: CISA added the flaw to the KEV on 2023-04-21 with known ransomware use, and EPSS rates exploitation probability at 100% within 30 days. Do: Apply the vendor's updates as instructed (this is the required action in CISA KEV) — upgrade PaperCut MF/NG to the patched releases listed in PaperCut's security advisory rather than relying on unpatched installs. Until patched, restrict network access to the PaperCut web/admin interface so it is reachable only from trusted hosts, and check the server for signs of compromise given known ransomware use. Prioritize internet-facing PaperCut servers, which public scans show are exposed in the thousands. | 9.8 | 100% | KEV ransomware PoC ×3 |
| masstens of thousands of organizations (~70k+) and millions of users; thousands of internet-exposed PaperCut servers |
Full article364 words · extracted from securityaffairs.com · click to collapse
U.S. CISA and FBI warned of attacks conducted by the Bl00dy Ransomware Gang against the education sector in the country.
The FBI and CISA issued a joint advisory warning that the Bl00dy Ransomware group is actively targeting the education sector by exploiting the PaperCut remote-code execution vulnerability CVE-2023-27350.
The Bl00dy ransomware has been active since May 2022, it has been the first group that started using the leaked LockBit ransomware builder in attacks in the wild.
According to the FBI, threat actors started exploiting the CVE-2023-27350 flaw in mid-April 2023 and the attacks are still ongoing. The attacks against the Education Facilities Subsector started in early May.
The report states that the gang is targeting the Education Facilities Subsector entities because they maintained approximately 68% of exposed, but not necessarily vulnerable, U.S.-based PaperCut servers.
As a result of some of these attacks, threat actors exfiltrated data of the victim systems and demanded the payment of a ransom for the decryption of encrypted files.
“According to FBI information, legitimate remote management and maintenance (RMM) software was downloaded and executed on victim systems via commands issued through PaperCut’s print scripting interface. External network communications through Tor and/or other proxies from inside victim networks helped Bl00dy Gang ransomware actors mask their malicious network traffic.” reads the joint alert. “The FBI also identified information relating to the download and execution of command and control (C2) malware such as DiceLoader, TrueBot, and Cobalt Strike Beacons, although it is unclear at which stage in the attack these tools were executed.”
The US agencies recommend network defenders focus detection efforts on network traffic signatures, system monitoring, and server settings and log files.
The report also provided Indicators of Compromise (IoCs) for this threat.
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