A vulnerability has been found in Fortinet FortiClient (the affected version unknown) and classified as critical. This vulnerability affects an unknown part. The manipulation with an unknown input leads to a inadequate encryption vulnerability. The CWE definition for the vulnerability is CWE-326. The product stores or transmits sensitive data using an encryption scheme that is theoretically sound, but is not strong enough for the level of protection required. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Users' VPN authentication credentials are unsafely encrypted in Fortinet FortiClient for Windows 5.6.0 and below versions, FortiClient for Mac OSX 5.6.0 and below versions and FortiClient SSLVPN Client for Linux 4.4.2335 and below versions, due to the use of a static encryption key and weak encryption algorithms.

The bug was discovered 12/07/2017. The weakness was presented 04/26/2018 (Website). The advisory is shared for download at fortiguard.com. This vulnerability was named CVE-2017-17543 since 12/11/2017. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1600.

The vulnerability was handled as a non-public zero-day exploit for at least 140 days. During that time the estimated underground price was around $0-$5k.

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

Productinfo

Vendor

• Fortinet

Name

• FortiClient

License

• free

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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