Critical Buffer Overflow Vulnerability Patched in FortiWeb Web Application Firewall

CVECVE-2023-23780
CVSScvssV3_1: 7.6
SourceCVE-2023-23780

FortiWeb is a popular web application firewall (WAF) made by Fortinet that is used to protect websites and web servers from attacks. A recent security audit discovered a vulnerability in older versions of FortiWeb that could allow attackers to take control of affected devices.

The vulnerability is a stack-based buffer overflow issue that exists in how FortiWeb handles specially crafted HTTP requests. By sending a long header in an HTTP request, an attacker could potentially overflow the buffer and execute arbitrary code on the device with elevated privileges. Once in control of the WAF, the attacker would then be able to bypass its protections and directly attack the websites and applications it is meant to safeguard.

Fortinet has released patches to address the vulnerability in FortiWeb versions 7.0.1 and 6.3.19. Administrators using affected versions should update their devices immediately. It is also recommended to keep FortiWeb systems up-to-date with the latest patches going forward to protect against future vulnerabilities. Proper network segmentation can further reduce risk by limiting direct access to devices like the WAF from untrusted networks.

While concerning, this is a good reminder of why maintaining updated software is critical for internet-facing systems. By applying the latest patches, FortiWeb customers can rest assured their web applications remain protected from exploits of disclosed vulnerabilities.

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