Fortinet FortiOS up to 6.0.4 SSL VPN Web Portal path traversal

Summaryinfo

A vulnerability was found in Fortinet FortiOS up to 6.0.4. It has been rated as critical. The affected element is an unknown function of the component SSL VPN Web Portal. Performing a manipulation results in path traversal. This vulnerability was named CVE-2018-13379. The attack may be initiated remotely. In addition, an exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Fortinet FortiOS up to 6.0.4 (Firewall Software). It has been classified as critical. This affects an unknown function of the component SSL VPN Web Portal. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality. The summary by CVE is:

An Improper Limitation of a Pathname to a Restricted Directory ("Path Traversal") in Fortinet FortiOS 6.0.0 to 6.0.4, 5.6.3 to 5.6.7 under SSL VPN web portal allows an unauthenticated attacker to download system files via special crafted HTTP resource requests.

The weakness was presented 05/24/2019 as FG-IR-18-384 as confirmed advisory (Website). The advisory is shared at fortiguard.com. This vulnerability is uniquely identified as CVE-2018-13379 since 07/06/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

The exploit is shared for download at exploit-db.com. It is declared as attacked. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 11/03/2021 with a due date of 05/03/2022:

Apply updates per vendor instructions.

Upgrading to version 5.6.8, 6.0.5 or 6.2.0 eliminates this vulnerability. It is possible to mitigate the problem by applying the configuration setting config vpn ssl settings; unset source-interface; end. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Exploit-DB (47288). See VDB-135937, VDB-135936, VDB-135935 and VDB-135934 for similar entries. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Firewall Software

Vendor

• Fortinet

Name

• FortiOS

Version

• 5.6.3
• 5.6.4
• 5.6.5
• 5.6.6
• 5.6.7
• 6.0.0
• 6.0.1
• 6.0.2
• 6.0.3
• 6.0.4

License

• commercial

Website

• Vendor: https://www.fortinet.com/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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