Home / vulnerabilities Viprinet Multichannel VPN Router 300 Identity Verification Fail
Posted on 07 February 2016
Source : packetstormsecurity.org Link
Vulnerability title: Remote SSL VPN Endpoint Identity Not Verified In Viprinet Multichannel VPN Router 300
CVE: CVE-2014-9754, CVE-2014-9755
Vendor: Viprinet
Product: Multichannel VPN Router 300
Affected version: 2013070830/2013080900
Fixed version: 2014013131/2014020702
Reported by: Tim Brown
Details:
In order for the hardware VPN client on the affected device to establish a VPN channel it connects to the remote VPN endpoint and initiates an SSL connection using TLSv1.1. It then initiates the following exchange (protocol version 2):
client> VERSION 3
server> ERROR
client> VERSION 2
server> +OK Protocol version 2 chosen
client> TUNNEL test
server> +OK Tunnel chosen
client> PASS test
server> +OK You are now authenticated
client> CHANNEL test
server> +OK Channel selected
client> DATA
The hardware VPN client does not validate the remote VPN endpoint identity (through the checking of the endpoint’s SSL key) before initiating the exchange.
In this example, we perform a downgrade attack from protocol version 3 to protocol version 2, however as noted in the impact, version 3 of the protocol is similarly affected.
Note: MITRE have assigned CVE-2014-9754 to reference the missing certificate validation and CVE-2014-9755 to reference the protocol downgrade attack.
Further details at: https://www.portcullis-security.com/security-research-and-downloads/security-advisories/cve-2014-9754-cve-2014-9755/
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