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Category:   Application (Security)  >   OpenSSL Vendors:   OpenSSL.org
(NetBSD Issues Fix) OpenSSL Protocol Flaw in SSL Renegotiation Lets Remote Users Conduct Man-in-the-Middle Attacks
SecurityTracker Alert ID:  1023467
SecurityTracker URL:  http://securitytracker.com/id/1023467
CVE Reference:   CVE-2009-3555   (Links to External Site)
Date:  Jan 18 2010
Impact:   Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): prior to 0.9.8l
Description:   A vulnerability was reported in OpenSSL. 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.

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:   NetBSD has issued a fix.

The NetBSD advisory is available at:

http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2010-002.txt.asc

Vendor URL:  www.openssl.org/ (Links to External Site)
Cause:   Authentication error
Underlying OS:  UNIX (NetBSD)
Underlying OS Comments:  4.0, 4.0.*, 5.0

Message History:   This archive entry is a follow-up to the message listed below.
Nov 6 2009 OpenSSL Protocol Flaw in SSL Renegotiation Lets Remote Users Conduct Man-in-the-Middle Attacks



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