Pierluigi Paganini
June 13, 2023
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.
A few days after the release of the Progress’s advisory, 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.
Now security researchers from Horizon3 have released a proof-of-concept (PoC) exploit code for the CVE-2023-34362 flaw. The experts created the PoC exploit by performing reverse engineering of the patch released by the company.
The researchers analyzed the differences between the vulnerable and patched versions.
Then the experts analyzed indicators of compromise associated with Clop ransomware attacks in an attempt to identify the attack abused by the threat actors. They found several paths to exploitation and attempted to abuse them for their PoC.
“This POC abuses an SQL injection to obtain a sysadmin API access token and then use that access to abuse a deserialization call to obtain remote code execution.” reads the PoC description published by the researchers. “This POC needs to reach out to an Identity Provider endpoint which hosts proper RS256 certificates used to forge arbitrary user tokens – by default this POC uses our IDP endpoint hosted in AWS.
By default, the exploit will write a file to C:\Windows\Temp\message.txt. Alternative payloads can be generated by using the ysoserial.net project.”
The public availability of PoC exploits can fuel attacks using them in the wild, likely other threat actors develop their own versions for their campaigns.
The report published by Horizon3 also includes Indicators of Compromise (IoCs) for the attacks exploiting the vulnerability.
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