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Cisco Security

FREAK SSL Downgrade Attack

 
Signature ID: 5891/1
Original Release:S858
Release:S866 (download)
Original Release Date:2015 March 25
Latest Release Date:2015 May 06
Default Enabled:False
Default Retired:low-mem-retired
Alarm Severity:High
Fidelity:80 

Description

Detects weak cipher offered in a server hello message. This can be the result of a man-in-the-middle attack attempting to downgrade encryption strength of the TLS channel, or may also indicate a connection that actually negotiated weak encryption.

Recommended Filter

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Benign Triggers

Old servers may legitimately be attempting to use a weak cipher. These servers should be evaluated to see if they can be upgraded to stronger encryption.

IntelliShield Alerts

IntelliShield ID Headline VersionCVSS ScoreLast Published
36956OpenSSL RSA Temporary Key Cryptographic Downgrade Vulnerability155.0/4.12016 August 23 12:30 GMT

Download

To download this and other IPS update files, please go to Cisco Secure Software Download.

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