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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.0491
                             TLS FREAK Attack
                               5 March 2015

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Fortinet FortiMail
Publisher:         Fortinet
Operating System:  Network Appliance
                   VMware ESX Server
Impact/Access:     Access Privileged Data         -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2015-0204  

Reference:         ESB-2015.0448
                   ESB-2015.0437
                   ESB-2015.0436
                   ESB-2015.0401
                   ESB-2015.0318
                   ESB-2015.0317
                   ESB-2015.0291
                   ESB-2015.0149
                   ESB-2015.0101

Original Bulletin: 
   http://www.fortiguard.com/advisory/FG-IR-15-007/

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TLS FREAK Attack

FREAK is an attack on SSL/TLS, which allows "Man in the Middle" attackers to 
decipher and alter HTTPS connections between a server supporting 
"export-grade" cipher suites and a vulnerable client.

It consists in downgrading the connection's encryption from "strong" RSA to 
"export-grade" RSA, by leveraging a vulnerability (CVE-2015-0204) on the 
client side. The "export-grade" encryption is weak enough to be broken by the
attacker, who can then decipher and alter the connection.

Impact

MitM that could lead to traffic alteration or decryption.

Affected Products

FortiMail all versions.

Solutions

As a workaround the following command must be set to prevent weak algorithms 
ciphers to be negotiated on FortiMail:

config system global
set strong-crypto enable
end

References

https://freakattack.com/

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
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