Clop ransomware gang claims the hack of hundreds of victims
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2023-0669 | Pre-Authentication Deserialization RCE in Fortra GoAnywhere MFT Fortra (formerly HelpSystems) GoAnywhere MFT is vulnerable to pre-authentication remote code execution (CWE-502) in the License Response Servlet, which deserializes an attacker-controlled object without validating it. An unauthenticated attacker who can reach the exposed administrative interface can send a crafted serialized object to the servlet and trigger code execution on the server. Successful exploitation gives the attacker the ability to run arbitrary code in the context of the application, which has been leveraged for ransomware operations. All organizations running GoAnywhere MFT with the affected component reachable by untrusted networks are in scope. The flaw is being actively exploited: CISA added it to the Known Exploited Vulnerabilities catalog on 2023-02-10, ransomware use is confirmed, and EPSS puts the 30-day exploitation probability at 100%. Do: Apply the vendor's updates for GoAnywhere MFT immediately, per Fortra's instructions, as required by the CISA KEV catalog. Until patched, restrict or block untrusted/internet access to the administrative interface hosting the License Response Servlet, and review logs for signs of exploitation given confirmed in-the-wild and ransomware use. | 7.2 | 100% | KEV ransomware PoC ×3 |
| moderate≈1,000–10,000 internet-exposed GoAnywhere MFT instances (public internet scans of the exposed administrative interface) | |
| CVE-2023-34362 | Unauthenticated SQL Injection in Progress MOVEit Transfer CVE-2023-34362 is an unauthenticated SQL injection flaw (CWE-89) in Progress MOVEit Transfer that allows an attacker with no credentials to gain unauthorized access to the product's database. It is triggered remotely via crafted input submitted to the MOVEit Transfer web application, with the impact varying by the backend database engine in use (MySQL, Microsoft SQL Server, or Azure SQL). A successful attacker can infer the structure and contents of the database and, depending on the engine, execute SQL statements that alter or delete database elements, exposing data handled by the file-transfer service. Any organization running an internet-reachable MOVEit Transfer instance is affected; public internet-exposure scans around disclosure identified on the order of a few thousand servers, each typically serving enterprise or government user bases. Exploitation is confirmed in the wild: the flaw was added to CISA KEV on 2023-06-02 with known ransomware use and an EPSS exploitation probability of 99.9% (100th percentile), while no public PoC is known. Do: Apply the vendor's updates immediately, per Progress instructions and CISA's required action. Until patched, restrict internet exposure of MOVEit Transfer and check the backend database for unexpected structure or content changes and deletions. Because in-the-wild exploitation and ransomware use are confirmed, treat any unpatched, internet-facing instance as potentially compromised and review stored transfer data and access logs for anomalies. | 9.8 | 100% | KEV ransomware PoC |
| large≈2,000-3,000 internet-exposed MOVEit Transfer servers (public internet-exposure scans) |
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Clop ransomware group claims to have hacked hundreds of companies globally by exploiting MOVEit Transfer vulnerability.
The Clop ransomware group may have compromised hundreds of companies worldwide by exploiting a vulnerability in MOVEit Transfer software.
MOVEit Transfer is a managed file transfer that is used by enterprises to securely transfer files using SFTP, SCP, and HTTP-based uploads.
The vulnerability is a SQL injection vulnerability, it can be exploited by an unauthenticated attacker to gain unauthorized access to MOVEit Transfer’s database.
“a SQL injection vulnerability has been found in the MOVEit Transfer web application that could allow an un-authenticated attacker to gain unauthorized access to MOVEit Transfer’s database.” reads the advisory published by the company. “Depending on the database engine being used (MySQL, Microsoft SQL Server, or Azure SQL), an attacker may be able to infer information about the structure and contents of the database in addition to executing SQL statements that alter or delete database elements.”
The vulnerability affects all MOVEit Transfer versions, it doesn’t affect the cloud version of the product.
Over the weekend, the Clop ransomware gang (aka Lace Tempest) was credited by Microsoft for the recent campaign that exploits a zero-day vulnerability, tracked as CVE-2023-34362, in the MOVEit Transfer platform.
On Wednesday, the Clop ransomware gang published an extortion note on its dark web leak site claiming to have information on hundreds of businesses.
“WE HAVE INFORMATION ON HUNDREDS OF COMPANIES SO OUR DISCUSSION WILL WORK VERY SIMPLE.” reads the message published by the gang.
The gang is urging victim organizations to contact them before their name will be added to the list of victims on the leak site. The group has fixed the deadline on June 14.
At this time it not possible to determine the exact number of organizations that were breached by the gang by exploiting the MOVEit Transfer vulnerability.
By May 31, Rapid7 experts discovered approximately 2,500 instances of MOVEit Transfer publicly accessible on the internet, with a significant portion located in the United States.
“Our teams have so far observed the same webshell name in multiple customer environments, which may indicate automated exploitation.” reported Rapid7.
One of the organizations that was hacked by exploiting the above issue is the payroll provider Zellis. The bad news is that as a result of the cyber attack on the payroll provider Zellis, the personal data of employees at the BBC and British Airways has been compromised and exposed.
One of Zellis’s customers, the British health and beauty retailer and pharmacy chain Boots also confirmed to have been impacted by the attack. The company has yet to determine the number of impacted employees.
Another impacted firm is the airline Aer Lingus, which confirmed that “some of our current and former employee data” has been disclosed.
This isn’t the first time that Clop ransomware gang carry out hacking campaign on a large scale by exploiting a zero-day vulnerability.
In February, the Clop ransomware group claimed to have stolen sensitive data from over 130 organizations by exploiting a zero-day vulnerability (CVE-2023-0669) in Fortra’s GoAnywhere MFT secure file transfer tool.
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(SecurityAffairs – hacking, Clop ransomware group)
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