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AUSCERT External Security Bulletin Redistribution
ESB-2016.2797
FortiOS flow-mode detection bypass under certain conditions
23 November 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Fortinet FortiOS
Publisher: FortiGuard
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-7541
Original Bulletin:
http://fortiguard.com/advisory/fortios-flow-mode-detection-bypass-under-certain-conditions
http://fortiguard.com/advisory/implementation-of-ctr-drbg-rng-in-fortios-4-3
Comment: This bulletin contains two (2) FortiGuard security advisories.
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FortiOS flow-mode detection bypass under certain conditions
Info
Risk
3Medium
Date
Nov 22 2016
Impact
Protection bypass
CVE ID
CVE-2016-7541
Fixed In Firmware
5.4.2
A FortiGate configured to use flow-based protection will stop monitoring
network sessions that are active when a scanning engine is reloaded after an
update (nearly instantaneous process).
This tends to impact long lived network sessions, with chances to be alive
during and after an update, such as SMBv3 sessions.
Impact
Protection bypass
Affected Products
FortiOS version 5.0.x
FortiOS version 5.2.x
FortiOS version 5.4.0 - 5.4.1
Risk
3 Medium
Solutions
FortiGates in routed mode:
Upgrade to FortiOS 5.4.2, or stay in proxy-based protection mode (default).
FortiGates in transparent mode:
Upgrade to FortiOS 5.4.2.
Acknowledgement
We are pleased to thank Yves Bieri, Stefan Frei, Christof Jungo of the Swisscom
security group, who discovered the issue while it was being in the process of
being fixed, and committed to responsible disclosure.
- ---
Implementation of CTR_DRBG RNG in FortiOS 4.3
Info
Risk
3Medium
Date
Nov 22 2016
Impact
Allows unauthorized disclosure of information
CVE ID
CVE-2016-8492
Fixed In Firmware
4.3.19,5.x
FortiOS 4.3 used to implement the ANSI X9.31 RNG to decrypt TLS/IPSec traffic.
It is now superseded by the CTR_DRBG implementation as per the NIST SP800-90
recommendations since FortiOS 5.0 GA release.
Impact
Allows unauthorized disclosure of information
Affected Products
FortiOS versions 4.3.0 to 4.3.18
Risk
3 Medium
Solutions
Upgrade to FortiOS 4.3.19, 5.0 or above.
Acknowledgement
Fortinet is pleased to thank Matthew D. Green and the Johns Hopkins university
Afor reporting this vulnerability under responsible disclosure.
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