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Category:   Device (Firewall)  >   Cisco ASA Vendors:   Cisco
Cisco ASA SSLv3 Decoding Function Lets Remote Users Decrypt TLS Traffic
SecurityTracker Alert ID:  1031373
SecurityTracker URL:  http://securitytracker.com/id/1031373
CVE Reference:   CVE-2014-8730   (Links to External Site)
Date:  Dec 15 2014
Impact:   Disclosure of system information, Disclosure of user information
Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Cisco ASA. A remote user can decrypt TLS sessions in certain cases.

The system may accept incorrect TLS padding when terminating TLSv1 CBC connections. A remote user can with the ability to conduct a man-in-the-middle attack can force a client to use a vulnerable SSLv3 decoding function with TLS and then conduct a BEAST-style of attack to decrypt portions of the session.

This protocol vulnerability is a variant of the POODLE ("Padding Oracle On Downgraded Legacy Encryption") attack.

This is a flaw in the protocol rather than in the TLS implementation.

The vendor has assigned bug ID CSCus08101 to this vulnerability.

The original advisory is available at:

https://www.imperialviolet.org/2014/12/08/poodleagain.html

Brian Smith, Adam Langley, and Yngve Pettersen separately reported this vulnerability.

Impact:   A remote user with the ability to conduct a man-in-the-middle attack can decrypt TLS sessions.
Solution:   No solution was available at the time of this entry.

The vendor's advisory is available at:

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-8730

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-8730 (Links to External Site)
Cause:   Access control error

Message History:   None.


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