Pierluigi Paganini January 07, 2021

An expert found multiple serious vulnerabilities in Fortinet’s FortiWeb web application firewall (WAF) that could expose corporate networks to hack.

Andrey Medov, a security researcher at Positive Technologies, found multiple serious vulnerabilities in Fortinet’s FortiWeb web application firewall (WAF) that could be exploited by attackers to hack into corporate networks.

The flaws, tracked as CVE-2020-29015, CVE-2020-29016, CVE-2020-29018, and CVE-2020-29019, have been already addressed by Fortinet with the release of security patches.

The vulnerabilities include a blind SQL injection, a stack-based buffer overflow issue, an overflow buffer overflow, and a format string vulnerability that could lead to the execution of unauthorized code or commands or denial-of-service (DoS) conditions.

The flaws reside in the FortiWeb administration interface, this means that a remote attacker could exploit them to potentially access the corporate network.

“A stack-based buffer overflow vulnerability in FortiWeb may allow an unauthenticated, remote attacker to overwrite the content of the stack and potentially execute arbitrary code by sending a crafted request with a large certname.” reads the PSIRT advisory for the CVE-2020-29016.

The vendor recommends the customers to upgrade to FortiWeb versions:

• 6.2.4 or above to address the CVE-2020-29015 flaw
• 6.3.6 or above to address the CVE-2020-29016 and CVE-2020-29018
• 6.3.8 or above to address the CVE-2020-29019

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Pierluigi Paganini

(SecurityAffairs – hacking, Fortinet FortiWeb)

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