Content Services Switch Protocol Flaw in SSL Renegotiation May Let Remote Users Conduct Man-in-the-Middle Attacks
|
|
SecurityTracker Alert ID: 1023218 |
|
SecurityTracker URL: http://securitytracker.com/id/1023218
|
|
CVE Reference:
CVE-2009-3555
(Links to External Site)
|
Date: Nov 20 2009
|
Impact:
Modification of user information
|
Vendor Confirmed: Yes Exploit Included: Yes
|
Version(s): 11500 Series
|
Description:
A vulnerability was reported in Cisco Content Services Switch (CSS) 11500 Series devices. 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.
As a workaround, Cisco indicates that the client authentication feature can be enabled as mitigation/solution. Additional information about this workaround is included in their advisory.
The vendor's advisory is available at:
http://www.cisco.com/warp/public/707/cisco-sa-20091109-tls.shtml
|
Vendor URL: www.cisco.com/warp/public/707/cisco-sa-20091109-tls.shtml (Links to External Site)
|
Cause:
Authentication error
|
|
Message History:
None.
|
Source Message Contents
|
|
|
[Original Message Not Available for Viewing]
|
|
