A vulnerability was found in Fortinet FortiClient up to 5.4.3/5.5.x on Windows and classified as critical. This issue affects an unknown function of the component Security Alert Handler. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A privilege escalation in Fortinet FortiClient Windows 5.4.3 and earlier as well as 5.6.0 allows attacker to gain privilege via exploiting the Windows "security alert" dialog thereby popping up when the "VPN before logon" feature is enabled and an untrusted certificate chain.

The bug was discovered 12/12/2017. The weakness was published 12/14/2017 (Website). The advisory is shared at fortiguard.com. The identification of this vulnerability is CVE-2017-7344 since 03/30/2017. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 5.4.4 or 5.6.0 eliminates this vulnerability.

Productinfo

Vendor

• Fortinet

Name

• FortiClient

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.4.0
• 5.4.1
• 5.4.2
• 5.4.3
• 5.5

License

• free

CPE 2.3info

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CPE 2.2info

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• 🔍
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