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Category:   OS (Microsoft)  >   Windows Kernel Vendors:   Microsoft
Microsoft Windows Protocol Flaw in SSL Renegotiation Lets Remote Users Conduct Man-in-the-Middle Attacks
SecurityTracker Alert ID:  1023571
SecurityTracker URL:  http://securitytracker.com/id/1023571
CVE Reference:   CVE-2009-3555   (Links to External Site)
Date:  Feb 10 2010
Impact:   Modification of user information
Vendor Confirmed:  Yes  
Version(s): 2000 SP4, 2003 SP2, XP SP3, Vista SP2, 2008 SP2, 2008 R2, 7; and prior service packs
Description:   A vulnerability was reported in Microsoft Windows. 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.

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:

http://www.microsoft.com/technet/security/advisory/977377.mspx

Vendor URL:  www.microsoft.com/technet/security/advisory/977377.mspx (Links to External Site)
Cause:   Authentication error
Underlying OS:  

Message History:   None.


 Source Message Contents

Date:  Wed, 10 Feb 2010 01:19:08 +0000
Subject:  Microsoft Windows


http://www.microsoft.com/technet/security/advisory/977377.mspx

CVE-2009-3555
 
 


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