As of November 2021, FBI forensic analysis indicated exploitation of a 0-day vulnerability in the FatPipe MPVPN® device software1 going back to at least May 2021. The vulnerability allowed APT actors to gain access to an unrestricted file upload function to drop a webshell for exploitation activity with root access, leading to elevated privileges and potential follow-on activity. Exploitation of this vulnerability then served as a jumping off point into other infrastructure for the APT actors. This vulnerability is not yet identified with a CVE number but can be located with the FatPipe Security Advisory number FPSA006. The vulnerability affects all FatPipe WARP®, MPVPN, and IPVPN® device software prior to the latest version releases 10.1.2r60p93 and 10.2.2r44p1.
The compromise of affected systems running FatPipe MPVPN software involves exploiting a servlet at the URL path /fpui/uploadConfigServlet and dropping a webshell /fpui/img/1.jsp with root privileges.
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1 A patented router clustering device.