Black Arrow Cyber Advisory 28 March 2023 – Clop Ransomware Victims of GoAnywhere Vulnerability Reach 130

Executive Summary

A vulnerability in Forta’s popular file transfer software GoAnywhere has allowed ransomware group “Clop” to breach around 130 organisations, with more still coming forward. The attacks by Clop have breached a variety of organisations including banks, law firms, energy companies, retailers and even the city of Toronto. Any organisation using a vulnerable version of GoAnywhere is at risk of a breach.

Technical Summary

The vulnerability being exploited is a pre-authentication injection vulnerability which allows an attacker to gain access by injecting malicious code, without having to authenticate themselves. A patch was released for the vulnerability February (GoAnywhere 7.1.2), which at the time was noted as a ‘high’ vulnerability.

What’s the risk to me or my business?

Organisations using a version of GoAnywhere prior to 7.1.2 are at risk of having sensitive data exfiltrated by Clop. Once data has been exfiltrated by Clop, an email is sent to the organisation threatening to sell their data. Additionally, organisations whose supply chain are using a vulnerable version of GoAnywhere may also be at risk.

What can I do?

Organisations using GoAnywhere should check to ensure the patched version 7.1.2 or later has been installed. Organisations should also consider whether any of their supply chain is using GoAnywhere software and if so, what version as this can put the organisation at risk. There is currently no publicly accessible advisory from the software provider; the official advisory requires an account with Forta to access more information.

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