The FBI and the Cybersecurity and Infrastructure Security Agency (CISA) have shared details about threat attackers having breached the webserver of a US municipal government after exploiting vulnerabilities in the Fortinet VPN appliances.
The two agencies had previously warned Advanced Persistent Threat (APT) groups were likely exploiting several critical vulnerabilities in the Fortinet appliances. They specifically identified three vulnerabilities tracked as CVE-2018-13379, CVE-2020-12812, and CVE-2019-5591, urging users to patch them without delay.
"As of at least May 2021, an APT actor group almost certainly exploited a Fortigate appliance to access a webserver hosting the domain for a U.S. municipal government," observed the FBI's Cyber Division in a flash alert as it continued to warn users of unpatched Fortinet appliances.
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The advisory further shared that the threat actors are “actively targeting” victims across multiple sectors, which suggests that they are indiscriminately looking for vulnerable hosts rather than targeting someone in particular.
Based on its analysis of the threat actor’s movements on the municipal government’s compromised system, the FBI shared that once they were in, they moved through the network and created new domain controller, server, and workstation user accounts.
The FBI suggests that the threat actors’ activities can possibly be leveraged for malicious activities including the collection and exfiltration of data from the victims' network.
"APT actors have historically exploited critical vulnerabilities to conduct distributed denial-of-service (DDoS) attacks, ransomware attacks, structured query language (SQL) injection attacks, spear phishing campaigns, website defacements, and disinformation campaigns," warned the agencies in their earlier advisory, as they suggested some mitigations to help Fortinet users avoid being attacked.
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