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AUSCERT External Security Bulletin Redistribution
ESB-2013.0698
Potential Man-In-The Middle Vulnerability in FortiClient VPN
16 May 2013
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AusCERT Security Bulletin Summary
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Product: FortiClient VPN
Publisher: Fortiguard
Operating System: Windows
Linux variants
OS X
Android
Impact/Access: Unauthorised Access -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Resolution: Patch/Upgrade
Original Bulletin:
http://www.fortiguard.com/advisory/Potential-Man-In-The-Middle-Vulnerability-in-FortiClient-VPN/
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Potential Man-In-The Middle Vulnerability in FortiClient VPN
Under certain conditions, FortiClient VPN may be susceptible to a certificate
validation vulnerability which would allow an attacker to intercept user
credentials in a man-in-the-middle attack.
Impact
If an attack is successful, full credentials will be revealed and thus full
access to the VPN from an outside attacker would be possible.
Affected Products
FortiClient Lite 4.3.3.445 for Windows
FortiClient 4.3.3.445 for Windows
FortiClient 4.0.2 for MacOS
FortiClient SSL VPN 4.0.2012 for Linux
FortiClient Lite 2.0 for Android
Risk
This is a limited scenario where the FortiClient VPN client needs to be tricked
into connecting to a proxy server rather than to the original firewall.
Solutions
Solutions have been available since April 2012. It is recommended to update to
a version greater or equal to the following affected product list:
FortiClient Lite 4.3.4.461 for Windows
FortiClient 4.3.5.472 for Windows
FortiClient 4.0.3.134 for MacOS
FortiClient SSL VPN 4.0.2258 for Linux
FortiClient 4.0 for Android (Replaces FortiClient Lite 2.0)
Acknowledgement
Cédric Tissières and Philippe Oechslin, Objectif Sécurité
References
Neohapsis
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