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TITLE:
Citrix Secure Gateway TLS Session Renegotiation Plaintext Injection

SECUNIA ADVISORY ID:
SA37320

VERIFY ADVISORY:
http://secunia.com/advisories/37320/

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:
SA37291:
http://secunia.com/advisories/37291/

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