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Category:   Device (Firewall)  >   Cisco ASA Vendors:   Cisco
Cisco ASA Protocol Flaw in SSL Renegotiation May Let Remote Users Conduct Man-in-the-Middle Attacks
SecurityTracker Alert ID:  1023204
SecurityTracker URL:  http://securitytracker.com/id/1023204
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): 5500 series
Description:   A vulnerability was reported in Cisco Adaptive Security Appliance (ASA). 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.

Cisco has assigned Cisco Bug ID to CSCtd00697 this vulnerability.

The Cisco ASA Advanced Inspection and Prevention (AIP) Security Services Module is also affected. Cisco has assigned Cisco Bug ID CSCtd01539 to this vulnerability.

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.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.


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