Fortinet has released security updates for FortiOS to mitigate novel post-exploitation activity observed against FortiGate devices. The disclosure details a new persistence technique used by an attacker, in conjunction with known vulnerabilities, to maintain read-only access to FortiGate devices through the use of symbolic links even after the initial access vector has been remediated.
Fortinet has stated that an attacker used a known vulnerability to compromise a FortiGate device and implement read-only access to the file system using a symbolic link between the user and root filesystems. If the vulnerable device was updated to remediate the original vulnerability, the symbolic link may not have been removed which could allow the attacker continued read-only access to the filesystem, including configuration files.
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Source: NHS Digital
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