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Vulnerability of Fortigate SSL VPN: privilege escalation via Credential Plaintext Storage

Synthesis of the vulnerability 

An attacker can bypass restrictions via Credential Plaintext Storage of Fortigate SSL VPN, in order to escalate his privileges.
Vulnerable software: FortiGate, FortiGate Virtual Appliance, FortiOS.
Severity of this announce: 1/4.
Creation date: 28/01/2020.
Références of this computer vulnerability: CERTFR-2020-AVI-058, CVE-2019-17655, FG-IR-19-217, VIGILANCE-VUL-31441.

Description of the vulnerability 

An attacker can bypass restrictions via Credential Plaintext Storage of Fortigate SSL VPN, in order to escalate his privileges.
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This computer threat note impacts software or systems such as FortiGate, FortiGate Virtual Appliance, FortiOS.

Our Vigil@nce team determined that the severity of this weakness alert is low.

The trust level is of type confirmed by the editor, with an origin of user shell.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this computer weakness note.

Solutions for this threat 

Fortigate SSL VPN: versions 6.0.10 and 6.2.3.
Versions 6.0.10 and 6.2.3 are fixed:
  https://fortiguard.com/
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Vigil@nce provides a software vulnerability alert. The Vigil@nce team tracks computer vulnerabilities impacting systems and applications.