Fortinet FortiOS up to 5.4.9/6.0.1 RSA PKCS #1 v1.5 cryptographic issue

Summaryinfo

A vulnerability labeled as critical has been found in Fortinet FortiOS up to 5.4.9/6.0.1. This issue affects some unknown processing of the component RSA PKCS #1 v1.5. Such manipulation leads to cryptographic issue. This vulnerability is traded as CVE-2018-9194. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Fortinet FortiOS up to 5.4.9/6.0.1 (Firewall Software). Affected by this issue is an unknown part of the component RSA PKCS #1 v1.5. The manipulation with an unknown input leads to a cryptographic issue vulnerability. Using CWE to declare the problem leads to CWE-310. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A plaintext recovery of encrypted messages or a Man-in-the-middle (MiTM) attack on RSA PKCS #1 v1.5 encryption may be possible without knowledge of the server's private key. Fortinet FortiOS 5.4.6 to 5.4.9, 6.0.0 and 6.0.1 are vulnerable by such attack under VIP SSL feature when CPx being used.

The weakness was shared 09/05/2018 as confirmed advisory (CERT.org). The advisory is shared for download at kb.cert.org. This vulnerability is handled as CVE-2018-9194 since 04/02/2018. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1600.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 43661 (Fortigate FortiOS Information Exposure Through Discrepancy Vulnerability (FG-IR-17-302)).

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

The entries VDB-110662, VDB-110663 and VDB-123643 are related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• Fortinet

Name

• FortiOS

Version

• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.0.6
• 5.0.7
• 5.0.8
• 5.0.9
• 5.2.0
• 5.2.1
• 5.2.2
• 5.2.3
• 5.2.4
• 5.2.5
• 5.2.6
• 5.2.8
• 5.2.9
• 5.2.10
• 5.2.11
• 5.2.12
• 5.4.0
• 5.4.1
• 5.4.2
• 5.4.3
• 5.4.4
• 5.4.5
• 5.4.6
• 5.4.7
• 5.4.8
• 5.4.9
• 6.0.0
• 6.0.1

License

• commercial

Website

• Vendor: https://www.fortinet.com/

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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