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Category:   Device (Firewall)  >   Fortinet FortiGate/FortiOS Vendors:   Fortinet
Fortinet FortiGate/FortiOS MAC Authentication Flaw Lets Remote Users Modify Data on the Target System
SecurityTracker Alert ID:  1033256
SecurityTracker URL:
CVE Reference:   CVE-2015-5965   (Links to External Site)
Date:  Aug 12 2015
Impact:   Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.3.12 and prior
Description:   A vulnerability was reported in Fortinet FortiGate/FortiOS. A remote user can modify data on the target system.

The SSL-VPN feature only validates the first byte of the TLS message authentication code. As a result, a remote user that can conduct a man-in-the-middle attack can modify encrypted data without detection by the target system.

The original advisory is available at:

Yngve N. Pettersen reported this vulnerability.

Impact:   A remote user can modify encrypted data transmitted by the target system without detection.
Solution:   The vendor has issued a fix (4.3.13, 5.0.x, 5.2.x).

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Authentication error

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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