A vulnerability in the cookie parser component of Fortinet FortiGate FortiOS could allow an unauthenticated, remote attacker to execute arbitrary code.
The vulnerability is due to improper parsing of crafted HTTP requests by the affected software. An attacker could exploit this vulnerability by sending a crafted HTTP request to a targeted device. An exploit could trigger a buffer overflow condition in the cookie parser component of the affected software, which the attacker could leverage to execute arbitrary code. A successful exploit could allow the attacker to gain remote administrative access to the targeted device, resulting in a complete system compromise.
Fortinet has confirmed the vulnerability and software updates are available.
To exploit this vulnerability, an attacker must send a crafted HTTP request to the targeted device, making exploitation more difficult in environments that restrict network access from untrusted sources.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators can help protect affected systems from external attacks by using a solid firewall strategy.
Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.
Administrators are advised to apply Snort SID 40241 to help prevent attacks that attempt to exploit the vulnerability.
Administrators are advised to monitor affected systems.
Fortinet has released a security advisory at the following link: FG-IR-16-023
Fortinet has released firmware versions 4.3.9 and 5.0 to mitigate this vulnerability. Customers are advised to contact the Fortinet Support Center at +1 408-235-7700 or +1 408-542-7780 for assistance on receiving the updates to mitigate this vulnerability on their devices.
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.