Fortinet FortiSwitch integer overflow

Summaryinfo

A vulnerability identified as problematic has been detected in Fortinet FortiSwitch, FortiRecorder, FortiOS, FortiProxy and FortiVoiceEnterprise. Affected by this vulnerability is an unknown functionality. Performing a manipulation results in integer overflow. This vulnerability is identified as CVE-2021-42755. The attack can only be performed from the local network. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Fortinet FortiSwitch, FortiRecorder, FortiOS, FortiProxy and FortiVoiceEnterprise (Firewall Software). It has been classified as problematic. This affects some unknown functionality. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on availability. The summary by CVE is:

An integer overflow / wraparound vulnerability [CWE-190] in FortiSwitch 7.0.2 and below, 6.4.9 and below, 6.2.x, 6.0.x; FortiRecorder 6.4.2 and below, 6.0.10 and below; FortiOS 7.0.2 and below, 6.4.8 and below, 6.2.10 and below, 6.0.x; FortiProxy 7.0.0, 2.0.6 and below, 1.2.x, 1.1.x, 1.0.x; FortiVoiceEnterprise 6.4.3 and below, 6.0.10 and below dhcpd daemon may allow an unauthenticated and network adjacent attacker to crash the dhcpd deamon, resulting in potential denial of service.

The weakness was released 07/19/2022 as FG-IR-21-155. It is possible to read the advisory at fortiguard.com. This vulnerability is uniquely identified as CVE-2021-42755 since 10/20/2021. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 209737 (Fortinet Fortigate (FG-IR-21-155)), 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 (209737). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• Fortinet

Name

• FortiOS
• FortiProxy
• FortiRecorder
• FortiSwitch
• FortiVoiceEnterprise

License

• commercial

Website

• Vendor: https://www.fortinet.com/

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

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