Secunia

Description
A vulnerability has been reported in Citrix Secure Gateway, which can be exploited by malicious people to manipulate certain data.

The vulnerability is caused due to an error in the TLS protocol while handling session renegotiations. This can be exploited to insert arbitrary plaintext before data sent by a legitimate client in an existing TLS session, via Man-in-the-Middle (MitM) attacks.

This is related to:
SA37291

The vulnerability is reported in Secure Gateway versions 3.0 and 3.1.

Solution
Do not rely on the integrity of incoming TLS data.

Provided and/or discovered by
Reported by the vendor in Citrix Secure Gateway.

Originally discovered independently by Marsh Ray of PhoneFactor and Martin Rex.

Original Advisory
Citrix:
http://support.citrix.com/article/CTX123359

Other references
Further details available in Customer Area

Deep Links
Links available in Customer Area