BSA-2017-337

Brocade Fabric OS

2 more products

21434

08 September 2017

23 June 2017

Closed

High

8.0

N/A

CVE-2017-7478

Summary

Security Advisory ID : BSA-2017-337

Component : OpenVPN

Revision : 2.0: Interim

An authenticated client can do the 'three way handshake' (P_HARD_RESET, P_HARD_RESET, P_CONTROL), where the P_CONTROL packet is the first that is allowed to carry payload. If that payload is too big, the OpenVPN server process will stop running due to an ASSERT() exception. That is also the reason why servers using tls-auth/tls-crypt are protected against this attack - the P_CONTROL packet is only accepted if it contains the session ID we specified, with a valid HMAC (challenge-response). This affects OpenVPN 2.3.12 and newer. OpenVPN versions 2.3.15, 2.4.2 and later include these fixes.

Affected Products
Product Current Assessment
Brocade 5400 vRouter Impacted: Fixed in 6.7R14.
Brocade 5600 vRouter Impacted: Fixed in 17.2.0.
Products Confirmed Not Vulnerable

Brocade Fabric OS, Brocade FastIron OS, Brocade NetIron OS, Brocade Network OS, Brocade ServerIron ADX, Brocade Services Director, Brocade SLX-OS, and Brocade Virtual ADX, Brocade Virtual Traffic Manager, and Brocade Virtual Web Application Firewall are confirmed not affected by this vulnerability.

Workaround

There are no workarounds that address this vulnerability.

Revision History

Version Change Date
1.0 Initial Publication June 23, 2017
2.0 Updated to address NOS September 8, 2017