Fortinet FortiOS/FortiPAM/FortiProxy HTTP Request out-of-bounds write

Summaryinfo

A vulnerability labeled as very critical has been found in Fortinet FortiOS, FortiPAM and FortiProxy. The affected element is an unknown function of the component HTTP Request Handler. Executing a manipulation can lead to out-of-bounds write. The identification of this vulnerability is CVE-2023-42789. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in Fortinet FortiOS, FortiPAM and FortiProxy (Firewall Software) (the affected version unknown) and classified as very critical. This vulnerability affects an unknown part of the component HTTP Request Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A out-of-bounds write in Fortinet FortiOS 7.4.0 through 7.4.1, 7.2.0 through 7.2.5, 7.0.0 through 7.0.12, 6.4.0 through 6.4.14, 6.2.0 through 6.2.15, FortiProxy 7.4.0, 7.2.0 through 7.2.6, 7.0.0 through 7.0.12, 2.0.0 through 2.0.13 allows attacker to execute unauthorized code or commands via specially crafted HTTP requests.

The weakness was shared 03/12/2024 as FG-IR-23-328. The advisory is shared for download at fortiguard.com. This vulnerability was named CVE-2023-42789 since 09/14/2023. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $25k-$100k (estimation calculated on 10/26/2024).

As 0-day the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 209712 (Fortinet Fortigate (FG-IR-23-328)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (209712). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Firewall Software

Vendor

• Fortinet

Name

• FortiOS
• FortiPAM
• FortiProxy

License

• commercial

Website

• Vendor: https://www.fortinet.com/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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