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Vulnerability of IPsec IKEv1 Main Mode: information disclosure via Brute Force

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via Brute Force of IKEv1 Main Mode, in order to obtain sensitive information.
Impacted software: BIG-IP Hardware, TMOS, FortiGate, FortiGate Virtual Appliance, FortiOS, Synology DSM, Unix (platform) ~ not comprehensive.
Severity of this computer vulnerability: 2/4.
Creation date: 16/08/2018.
Références of this announce: CVE-2018-5389, FG-IR-18-214, K42378447, Synology-SA-18:46, VIGILANCE-VUL-27022, VU#857035.

Description of the vulnerability 

An attacker can bypass access restrictions to data via Brute Force of IKEv1 Main Mode, in order to obtain sensitive information.
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This weakness note impacts software or systems such as BIG-IP Hardware, TMOS, FortiGate, FortiGate Virtual Appliance, FortiOS, Synology DSM, Unix (platform) ~ not comprehensive.

Our Vigil@nce team determined that the severity of this threat note is medium.

The trust level is of type confirmed by the editor, with an origin of internet client.

An attacker with a expert ability can exploit this computer weakness.

Solutions for this threat 

IPsec IKEv1 Main Mode: workaround for Brute Force.
A workaround is to use a PSK with at leat 20 characters.

F5 BIG-IP: solution for IPsec IKEv1.
The solution is indicated in information sources.

FortiOS: solution for IKE Pre-Shared Key.
The solution is indicated in information sources.

Synology DSM: solution for IKEv1.
The solution is indicated in information sources.
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