Open redirect in sslvpnd

Summary

A URL redirection to untrusted site ('Open Redirect') vulnerability [CWE-601] in FortiOS and FortiProxy sslvpnd may allow an authenticated attacker to redirect users to any arbitrary website via a crafted URL.

Affected Products

FortiOS version 7.2.0 through 7.2.3
FortiOS version 7.0.0 through 7.0.9
FortiOS version 6.4.0 through 6.4.12
FortiOS all versions 6.2, 6.0
FortiProxy version 7.2.0 through 7.2.2
FortiProxy version 7.0.0 through 7.0.8
FortiProxy all versions 2.0, 1.2, 1.1, 1.0

Solutions

Please upgrade to FortiProxy version 7.2.3 or above
Please upgrade to FortiProxy version 7.0.9 or above
Please upgrade to FortiOS version 7.2.4 or above
Please upgrade to FortiOS version 7.0.10 or above
Please upgrade to FortiOS version 6.4.13 or above

Acknowledgement

Internally discovered and reported by Gwendal Guégniaud of Fortinet Product Security team.

Timeline

2023-04-11: Initial publication
2023-06-20: added FortiOS 6.4.13 in fixed versions.