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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0668 Sweet32 Birthday attack in TLS 4 March 2019 =========================================================================== 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 - --------------------------BEGIN INCLUDED TEXT-------------------- 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/ - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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