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AUSCERT External Security Bulletin Redistribution
ESB-2015.1966
FortiOS supports weak ciphers suites when connecting to Fortiguard servers
28 July 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: FortiOS
Publisher: FortiGuard
Operating System: Network Appliance
Impact/Access: Provide Misleading Information -- Remote with User Interaction
Unauthorised Access -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2015-2323
Original Bulletin:
http://www.fortiguard.com/advisory/FG-IR-15-021/
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FortiOS supports weak ciphers suites when connecting to Fortiguard servers
Info
Risk 2 Low
Date Jul 24 2015
Impact MitM that could lead to traffic alteration or decryption
CVE ID CVE-2015-2323
When connecting to a FortiGuard server via TLS, FortiOS 5.2.3/5.0.11 and below
is supporting multiple weak ciphers including anonymous, export and RC4.
Although FortiGuard servers are actually offering back strong ciphers only, an
attacker in a "Man in the Middle" position may leverage FortiOS' acceptance of
weak ciphers to decipher and tamper with the TLS connection.
Affected Products
FortiOS 5.2.0 to 5.2.3
FortiOS 5.0.0 to 5.0.11
Solutions
FortiOS (including with FIPS-CC licenses) must be upgraded to 5.0.12 or 5.2.4.
Acknowledgement
Thanks to the Citrix Security Team.
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