Detections
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Fortinet Fortigate Security Best Practice: Antivirus evasion via malformed RAR file (FG-IR-20-037)

medium Nessus Plugin ID 209805

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Synopsis

Fortinet Firewall is missing one or more security-related updates.

Description

The version of Fortigate installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the FG-IR-20-037 advisory.

 - FortiClient and FortiOS AV engines may not immediately detect certain types of malformed or non-standard RAR archives, potentially containing malicious files.Based on the samples provided, FortiClient will detect the malicious files upon trying extraction by real-time scanning and FortiGate will detect the malicious archive if Virus Outbreak Prevention is enabled. (CVE-2020-9295)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Please upgrade to FortiOS version 6.2/6.4/6.00145 or later.

See Also

https://www.fortiguard.com/psirt/FG-IR-20-037

Plugin Details

Severity: Medium

ID: 209805

File Name: fortigate_FG-IR-20-037.nasl

Version: 1.2

Type: local

Family: Firewalls

Published: 10/27/2024

Updated: 10/29/2024

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2020-9295

CVSS v3

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:fortinet:fortios

Required KB Items: Settings/ParanoidReport, Host/Fortigate/model, Host/Fortigate/version

Exploit Ease: No known exploits are available

Reference Information

CVE: CVE-2020-9295