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Category:   Device (Encryption/VPN)  >   Citrix NetScaler Vendors:   Citrix
Citrix NetScaler SSL 3.0 Protocol Downgrade Flaw Lets Remote Users Decrypt SSL Traffic
SecurityTracker Alert ID:  1031130
SecurityTracker URL:  http://securitytracker.com/id/1031130
CVE Reference:   CVE-2014-3566   (Links to External Site)
Date:  Oct 29 2014
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   A vulnerability was reported in Citrix NetScaler. A remote user can decrypt SSL sessions in certain cases.

A remote user can with the ability to conduct a man-in-the-middle attack can force a client to negotiate a downgrade to SSLv3 instead of a TLS v1.x protocol and then conduct a BEAST-style of attack to decrypt portions of the session.

This protocol vulnerability is referred to as the POODLE ("Padding Oracle On Downgraded Legacy Encryption") vulnerability.

This is a flaw in the protocol rather than in the SSL implementation.

The original advisory is available at:

https://www.openssl.org/~bodo/ssl-poodle.pdf

Bodo Moller, Thai Duong, and Krzysztof Kotowicz reported this vulnerability.

Impact:   A remote user with the ability to conduct a man-in-the-middle attack can decrypt SSL sessions.
Solution:   The vendor has described a configuration solution in their advisory.

The vendor's advisory is available at:

http://support.citrix.com/article/CTX200238

Vendor URL:  support.citrix.com/article/CTX200238 (Links to External Site)
Cause:   Access control error

Message History:   None.


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