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Category:   Application (Generic)  >   Citrix XenApp (MetaFrame Presentation Server) Vendors:   Citrix
Citrix Products Protocol Flaw in SSL Renegotiation May Let Remote Users Conduct Man-in-the-Middle Attacks
SecurityTracker Alert ID:  1023163
SecurityTracker URL:
CVE Reference:   CVE-2009-3555   (Links to External Site)
Updated:  Nov 18 2009
Original Entry Date:  Nov 11 2009
Impact:   Modification of user information
Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in various Citrix products that implement SSL. A remote user can conduct a man-in-the-middle attack on SSL session renegotiation.

A remote user with the ability to conduct a man-in-the-middle attack can exploit a flaw in the underlying SSL/TLS protocol to inject arbitrary plain text into the exchange between the client and the server, with the arbitrary data as a prefix to the session.

The vulnerability resides in the TLS 1.0 or later and SSLv3 protocols.

The specific impact of this protocol flaw depends on the application using SSL/TLS.

Citrix is evaluating XenApp and other products to determine if they are affected.

Citrix is evaluating the following product versions to determine if they are affected:

* Citrix Licensing 11.5
* Citrix Licensing 11.6
* EdgeSight for XenApp 5.0
* EdgeSight for XenApp 5.1
* EdgeSight for XenApp 5.2
* Password Manager 4.6
* Presentation Server 4.5 for Windows Server 2003
* Secure Gateway 3.1
* Web Interface 5.1
* Web Interface 5.2
* XenApp 5.0 for Windows Server 2003 x64
* XenApp 5.0 for Windows Server 2003 x86
* XenApp 5.0 for Windows Server 2008 x64
* XenApp 5.0 for Windows Server 2008 x86
* XenApp Fundamentals 3.0
* XenApp Plug-in for Windows (32/64 Bit)
* XenDesktop 3.0 x32
* XenDesktop 4.0 x32

Marsh Ray of PhoneFactor and Martin Rex independently reported this vulnerability.

[Editor's note: The flaw resides in the protocol and not in the protocol implementation. Some vendors are implementing a temporary workaround that prohibits session renegotiation until the protocol itself can be modified. Several protocol implementations are affected, including OpenSSL, GnuTLS, Network Security Services, and Java Secure Socket Extension.]

Impact:   A remote user can with the ability to conduct a man-in-the-middle attack can inject arbitrary plain text data into the exchange, preceding the session data.
Solution:   No solution was available at the time of this entry.

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Authentication error
Underlying OS:  Windows (Any)

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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