Fortinet FortiAnalyzer/FortiManager/FortiOS/FortiProxy CLI Command buffer overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in Fortinet FortiAnalyzer, FortiManager, FortiOS and FortiProxy. This impacts an unknown function of the component CLI Command Handler. Such manipulation leads to buffer overflow. This vulnerability is referenced as CVE-2021-43072. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability was found in Fortinet FortiAnalyzer, FortiManager, FortiOS and FortiProxy (Firewall Software) (affected version not known) and classified as critical. Affected by this issue is some unknown functionality of the component CLI Command Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A buffer copy without checking size of input ('classic buffer overflow') in Fortinet FortiAnalyzer version 7.0.2 and below, version 6.4.7 and below, version 6.2.9 and below, version 6.0.11 and below, version 5.6.11 and below, FortiManager version 7.0.2 and below, version 6.4.7 and below, version 6.2.9 and below, version 6.0.11 and below, version 5.6.11 and below, FortiOS version 7.0.0 through 7.0.4, 6.4.0 through 6.4.8, 6.2.0 through 6.2.10, 6.0.x and FortiProxy version 7.0.0 through 7.0.3, 2.0.0 through 2.0.8, 1.2.x, 1.1.x and 1.0.x allows attacker to execute unauthorized code or commands via crafted CLI `execute restore image` and `execute certificate remote` operations with the tFTP protocol.

The weakness was published 07/18/2023 as FG-IR-21-206. The advisory is shared for download at fortiguard.com. This vulnerability is handled as CVE-2021-43072 since 10/28/2021. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 209744 (Fortinet Fortigate (FG-IR-21-206)), 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 (209744). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Firewall Software

Vendor

• Fortinet

Name

• FortiAnalyzer
• FortiManager
• FortiOS
• 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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