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AUSCERT External Security Bulletin Redistribution
TLS FREAK Attack
5 March 2015
AusCERT Security Bulletin Summary
Product: Fortinet FortiMail
Operating System: Network Appliance
VMware ESX Server
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
CVE Names: CVE-2015-0204
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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.
MitM that could lead to traffic alteration or decryption.
FortiMail all versions.
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
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