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Date: Mon, 08 Jun 2015 14:47:52 +0200
From: Tobias Brunner <>
To: "Alexander E. Patrakov" <>
Subject: Re: StrongSwan VPN client for Android leaks username to rouge server

Hi Alexander,

> I found that, in the event of DNS spoofing, StrongSwan VPN client for 
> Android can leak the username and the MSCHAPv2 authentication value to a 
> rogue server if it has any valid X.509 certificate. Unless I 
> misunderstand something about X.509 certificates and their use for 
> confirming IKEv2 identities, and unless this is already known, this 
> might use a CVE ID.

Thanks for bringing this to our attention.  We've just released a fix
for this vulnerability [1], which has been registered as CVE-2015-4171.

An updated version of the Android app and strongSwan 5.3.2 that both
include the fix were also released [2].



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