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Category:   Device (Firewall)  >   Fortinet FortiGate/FortiOS Vendors:   Fortinet
Fortinet FortiOS WPA/WPA2 Protocol Key Reinstallation Attack Lets Remote Users Access and Modify Data on the Target Wireless Network
SecurityTracker Alert ID:  1039585
SecurityTracker URL:  http://securitytracker.com/id/1039585
CVE Reference:   CVE-2017-13077, CVE-2017-13078, CVE-2017-13079, CVE-2017-13080, CVE-2017-13081   (Links to External Site)
Date:  Oct 17 2017
Impact:   Disclosure of system information, Disclosure of user information, Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 5.0.x and before, 5.2.0 - 5.2.11, 5.4.0 - 5.4.5, 5.6.0 - 5.6.2
Description:   Multiple vulnerabilities were reported in Fortinet FortiOS. A remote user on the wireless network can access and modify data on the wireless network.

A remote user within range of the wireless network can record and replay retransmissions of part of the 802.11i 4-way handshake of the WPA and WPA2 protocols to force a reinstallation of the pairwise transient key, a group key, or an integrity key and force a reset of the incremental transmit packet number nonce and the receive replay counter. As a result, the remote user can replay encrypted packets, decrypt packets, and forge packets.

A remote user on the wireless network can reinstall the pairwise encryption key (PTK-TK) [CVE-2017-13077].

A remote user on the wireless network can reinstall the group key (GTK) [CVE-2017-13078, CVE-2017-13080].

A remote user on the wireless network can reinstall the integrity group key (IGTK) [CVE-2017-13079, CVE-2017-13081].

FortiWifi models operating in Wifi Client mode are affected.

This set of vulnerabilities is referred to as KRACK (Key Reinstallation AttaCK).

The original advisory is available at:

https://papers.mathyvanhoef.com/ccs2017.pdf

Additional information is available at:

https://www.krackattacks.com/

[Editor's note: The vulnerabilities reside in the WPA and WPA2 protocol specification and are not due to incorrect vendor implementation of the standards.]

Mathy Vanhoef and Frank Piessens from Katholieke Universiteit Leuven reported these vulnerabilities.

Impact:   A remote user on the wireless network can access and modify data on the wireless network.
Solution:   The vendor has issued a fix (5.6.2 special build, available via local TAC).

The fix will also be included in pending versions 5.2.12, 5.4.6, and 5.6.3.

The vendor advisory is available at:

http://fortiguard.com/psirt/FG-IR-17-196

Vendor URL:  fortiguard.com/psirt/FG-IR-17-196 (Links to External Site)
Cause:   Access control error, State error

Message History:   None.


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