Fortinet FortiOS up to 6.0.13/6.2.9/6.4.6/7.0.1 Firmware Signature Verification heap-based overflow

Summaryinfo

A vulnerability was found in Fortinet FortiOS up to 6.0.13/6.2.9/6.4.6/7.0.1. It has been classified as critical. The impacted element is an unknown function of the component Firmware Signature Verification Handler. This manipulation causes heap-based overflow. This vulnerability appears as CVE-2021-36173. The attacker needs to be present on the local network. There is no available exploit.

Detailsinfo

A vulnerability has been found in Fortinet FortiOS up to 6.0.13/6.2.9/6.4.6/7.0.1 (Firewall Software) and classified as critical. Affected by this vulnerability is an unknown code block of the component Firmware Signature Verification Handler. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was presented 12/09/2021 as FG-IR-21-115. It is possible to read the advisory at fortiguard.com. This vulnerability is known as CVE-2021-36173 since 07/06/2021. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/28/2024).

The vulnerability scanner Nessus provides a plugin with the ID 209816 (Fortinet Fortigate (FG-IR-21-115)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (209816). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• Fortinet

Name

• FortiOS

Version

• 6.0.0
• 6.0.1
• 6.0.2
• 6.0.3
• 6.0.4
• 6.0.5
• 6.0.6
• 6.0.7
• 6.0.8
• 6.0.9
• 6.0.10
• 6.0.11
• 6.0.12
• 6.0.13
• 6.2.0
• 6.2.1
• 6.2.2
• 6.2.3
• 6.2.4
• 6.2.5
• 6.2.6
• 6.2.7
• 6.2.8
• 6.2.9
• 6.4.0
• 6.4.1
• 6.4.2
• 6.4.3
• 6.4.4
• 6.4.5
• 6.4.6
• 7.0.0
• 7.0.1

License

• commercial

Website

• Vendor: https://www.fortinet.com/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion