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AUSCERT External Security Bulletin Redistribution
ESB-2020.1795
Blind Reset Attack Using the RST/SYN Bit
21 May 2020
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AusCERT Security Bulletin Summary
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Product: FortiAnalyzer
FortiManager
Publisher: Fortinet
Operating System: Network Appliance
Linux variants
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2004-0230
Reference: ESB-2014.1606
Original Bulletin:
https://fortiguard.com/psirt/FG-IR-16-039
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CVE-2004-0230 Blind Reset Attack Using the RST/SYN Bit
IR Number : FG-IR-16-039
Date : May 20, 2020
Risk : 3/5
Impact : Denial of Service (DoS)
CVE ID : CVE-2004-0230
Summary
TCP stacks that lack RFC 5961 3.2 & 4.2 support (or have it disabled at
application level) may allow remote attackers to guess sequence numbers and
cause a denial of service (connection loss) to persistent TCP connections by
repeatedly injecting a TCP RST or SYN packet.
Impact
Denial of Service (DoS)
Affected Products
FortiAnalyzer 6.2.3 and below
FortiManager 6.2.3 and below
Solutions
Upgrade to FortiAnalyzer 6.2.4 or above
Upgrade to FortiManager 6.2.4 or above
Workaround:
Restrict hosts that can connect to the GUI to trusted ones only, with the
trusted host feature.
References
o The following issues reported by vulnerability scanners are directly linked
to this issue:
o "TCP Sequence Number Approximation Based Denial of Service"
o "Blind Reset Attack Using the RST/SYN Bit"
o CVE-2004-0230: https://nvd.nist.gov/vuln/detail/CVE-2004-0230
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