ESB-2019.0668 - [Appliance] FortiOS Web adminUI, FortiOS SSL VPN Web Portal, FortiAP, FortiAnalyzer and FortiSwitch: Access confidential data - Remote/unauthenticated 2019-03-04

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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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