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Modbus TCP - (0x18) Read FIFO Queue Invalid Request

 
Signature ID: 1769/0
Original Release:S745
Release:S745 (download)
Original Release Date:2013 October 01
Latest Release Date:2013 October 01
Default Enabled:False
Default Retired:True
Alarm Severity:Medium
Fidelity:75 

Description

Description: Attackers can use specially crafted Read FIFO Queue Request messages to cause a denial of service attacks and to identify weaknesses in the MODBUS/TCP implementation.Notes:This signature checks Modbus Read FIFO Queue function (code: 0x18) request packet against the protocol specification and alerts if the packet does not comply with the protocol.Signature checks the protocol bytes to confirm this is a modbus packet. Length in the protocol for this packet must be 0x04. This is also checked as part of decision to confirm this is modbus packet. If this value or protocol bytes are not correct, then the packet is considered as non modbus traffic and no alert is generated.Then, packet size is checked to confirm no trailing data exceeding the expected size of 4 bytes. False Negatives:Short packets will not be captured by this signature. Short packets will be captured under it's own signature.False Positives:No known false positives.You are entitled to use this signature only if you have purchased an IPS SCADA Signature License

Recommended Filter

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Benign Triggers

There are no known benign triggers.

IntelliShield Alerts

IntelliShield ID Headline VersionCVSS ScoreLast Published
23515MODBUS/TCP Read FIFO Queue Response Parameters Processing Denial of Service Vulnerability12011 October 25 14:47 GMT

Download

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