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

Summaryinfo

A vulnerability identified as critical has been detected in Fortinet FortiOS up to 5.4.9/6.0.1. This vulnerability affects unknown code of the component RSA PKCS #1. This manipulation causes cryptographic issue. This vulnerability appears as CVE-2018-9192. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as critical was found in Fortinet FortiOS up to 5.4.9/6.0.1 (Firewall Software). Affected by this vulnerability is some unknown functionality of the component RSA PKCS #1. The manipulation with an unknown input leads to a cryptographic issue vulnerability. The CWE definition for the vulnerability is CWE-310. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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 SSL Deep Inspection feature when CPx being used.

The bug was discovered 12/22/2017. The weakness was presented 09/05/2018 as confirmed advisory (CERT.org). It is possible to read the advisory at kb.cert.org. This vulnerability is known as CVE-2018-9192 since 04/02/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1600 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 257 days. During that time the estimated underground price was around $0-$5k. 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.

See VDB-110662, VDB-110663 and VDB-123644 for similar entries. Statistical analysis made it clear that VulDB provides the best quality 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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Entryinfo

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