Blue Coat ProxySG Protocol Flaw in SSL Renegotiation Lets Remote Users Conduct Man-in-the-Middle Attacks
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SecurityTracker Alert ID: 1023655 |
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SecurityTracker URL: http://securitytracker.com/id?1023655
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CVE Reference:
CVE-2009-3555
(Links to External Site)
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Date: Feb 25 2010
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Impact:
Modification of user information
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Vendor Confirmed: Yes
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Description:
A vulnerability was reported in Blue Coat ProxySG. 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.]
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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.
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Solution:
No solution was available at the time of this entry.
The vendor's advisory is available at:
https://kb.bluecoat.com/index?page=content&id=SA44
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Vendor URL: kb.bluecoat.com/index?page=content&id=SA44 (Links to External Site)
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Cause:
Authentication error
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Underlying OS:
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Message History:
None.
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Source Message Contents
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Date: Thu, 25 Feb 2010 05:33:26 +0000
Subject: BlueCoat ProxySG
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https://kb.bluecoat.com/index?page=content&id=SA44
TLS/SSLv3 renegotiation (CVE-2009-3555)
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