FBI Warns of Actively Exploited FatPipe Zero-Day Vulnerability

The Federal Bureau of Investigation (FBI) this week sounded the alarm on a zero-day vulnerability in FatPipe products that has been under active exploitation since at least May 2021.

No CVE identifier has been issued for the security error yet, but FatPipe, which specializes in SD-WAN solutions, did confirm that its WARP, MPVPN, and IPVPN devices are affected by the issue.

The flaw exists because there’s no input and validation check for certain HTTP requests, thus allowing an attacker to send modified HTTP requests to a vulnerable device.

FatPipe says the bug resides in the web management interface of FatPipe software and could be exploited to upload files to any location on the filesystem.

In an alert this week, the FBI warns that adversaries have been exploiting the security hole to deploy a webshell that provides them with root access to a compromised device, enabling further malicious activities.

“Exploitation of this vulnerability then served as a jumping off point into other infrastructure for the APT actors,” the FBI warns.

The attackers have been leveraging SSH access for the routing of malicious traffic through the compromised devices. The access was used to target additional U.S. infrastructure, the FBI says.

Following the exploitation, the adversaries performed a cleanup on the infected systems, to hide their activity and protect their exploit, the Bureau also notes.

The vulnerability was addressed with the release of FatPipe WARP, MPVPN, and IPVPN device software versions 10.1.2r60p93 and 10.2.2r44p1 this week.

Users are advised to update to a patched version of the software as soon as possible. No workarounds are available for the bug, but disabling UI access on all the WAN interfaces or setting Access Lists on the interface page to block untrusted sources should prevent exploitation.

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Ionut Arghire is an international correspondent for SecurityWeek.

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