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AUSCERT External Security Bulletin Redistribution
ESB-2019.0668
Sweet32 Birthday attack in TLS
4 March 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: FortiOS Web adminUI
FortiOS SSL VPN Web Portal
FortiAP
FortiAnalyzer
FortiSwitch
Publisher: FortiGuard
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-2183
Reference: ASB-2016.0120
ESB-2019.0097
ESB-2017.1868
ESB-2017.1832
ESB-2017.1675
ESB-2017.1601
ESB-2017.1593
Original Bulletin:
https://fortiguard.com/psirt/FG-IR-17-173
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Sweet32 Birthday attack in TLS
IR Number : FG-IR-17-173
Date : Feb 07, 2019
Risk : 3/5
Impact : Information Disclosure
CVE ID : CVE-2016-2183
Summary
The DES and Triple DES ciphers, as used in the TLS, SSH, and IPSec protocols
and other protocols and products, have a birthday bound of approximately four
billion blocks, which makes it easier for remote attackers to obtain cleartext
data via a birthday attack against a long-duration encrypted session, as
demonstrated by an HTTPS session using Triple DES in CBC mode, aka a "Sweet32"
attack.
https://nvd.nist.gov/vuln/detail/CVE-2016-2183
Impact
Information Disclosure
Affected Products
FortiOS Web adminUI: 5.0.5 and below
FortiOS SSL VPN Web Portal: 5.2.9 and below, 5.4.0, 5.4.1
FortiOS VIP, WANOpt, VoIP: 5.4.4 and below
FortiOS webfilter override and authentication service: 5.4.8 and below, 5.6.0
to 5.6.3
FortiAP 5.4.4 and below, 5.6.0 to 5.6.4, 6.0.0
FortiAnalyzer 5.2.9 and below, 5.4.0, 5.4.1, 5.4.6 and above for 5.4 branch,
6.0.2
FortiSwitch 3.6.7 and below, 6.0.0, 6.0.1
Solutions
FortiOS Web adminUI:
Upgrade to 5.0.6 and above and ensure following CLI command set:
config system global
set strong-crypto enable
end
FortiOS SSL VPN Web Portal:
Upgrade to 5.2.10 and above for 5.2 branch, 5.4.2 and above and ensure
following CLI command set:
config vpn ssl settings
set algorithm high
end
Alternative, start from FortiOS 5.4.1, using following CLI command can disable
3des ciphers:
config vpn ssl settings
set banned-cipher 3DES
end
FortiOS VIP, WANOpt, VoIP:
Upgrade to 5.4.5 and above and ensure following CLI command set:
config wanopt settings
set tunnel-ssl-algorithm high
end
config firewall ssl-server
set ssl-algorithm high
end
config voip profile
edit [profile-name]
config sip
set ssl-algorithm high
end
next
end
config firewall vip
edit [vip-name]
set type server-load-balance
set server-type ssl
set ssl-algorithm high
next
end
config web-proxy explicit
set ssl-algorithm high
end
FortiOS webfilter override and authentication service:
Upgrade to 5.4.9 and above for 5.4 branch, 5.6.4 and above and ensure following
CLI command set:
config system global
set strong-crypto enable
end
FortiAP:
Upgrade to 5.4.5 and above for 5.4 branch, 5.6.5 and above for 5.6 branch and
6.0.1 and above
FortiAnalyzer:
Upgrade to 5.2.10 and above for 5.2 branch, 5.4.2 to 5.4.5*, 5.6.0 and above
for 5.6 branch, 6.0.0, 6.0.1, 6.0.3* and above and ensure following CLI
commands set:
config system global
set enc-algorithm high
set ssl-low-encryption disable
end
* FortiAnalyzer 5.4 branch start from 5.4.6 still vulnerable to Sweet32 attack
* FortiAnalyzer 6.0.2 still vulnerable to Sweet32 attack.
FortiSwitch:
Upgrade to 3.6.8 and above for 3.6 branch, 6.0.2 and above and ensure following
CLI commands set:
config sytem global
set strong-crypto enable
end
References
o https://sweet32.info/
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