Alert - Fortinet Cookie Parser Buffer Overflow Vulnerability

Number: AL16-017
Date: 18 August 2016

Purpose

The purpose of this alert is to bring attention to the FortiGate Cookie Parser Buffer Overflow Vulnerability VulnerabilityA flaw or weakness in the design or implementation of an information system or its environment that could be exploited to adversely affect an organization's assets or operations. .

Assessment

CCIRC is aware of a recently disclosed vulnerability in FortiGate firmware (FOS).  This vulnerability, when exploited by a specially crafted HTTP request, can allow a malicious actor to gain remote administrative access.

Affected firmware versions:
FortiGate versions 4.3.8 and prior
FortiGate versions 4.2.12 and prior
FortiGate versions 4.1.10 and prior

Suggested Action

CCIRC recommends that organizations review the following mitigation information and consider their implementation in the context of their network environment.

Upgrade to release 5.x.
Upgrade to release 4.3.9 or above for models not compatible with FortiOS 5.x.

References:

Fortinet Advisory
http://fortiguard.com/advisory/FG-IR-16-023