Signature Detail
Short Name |
SCADA:MODBUS:OVERLONG-PDU |
|---|---|
Severity |
Medium |
Recommended |
No |
Category |
SCADA |
Keywords |
MODNUS OVERLONG |
Release Date |
2008/01/22 |
Update Number |
1213 |
Supported Platforms |
idp-4.0.110090709+, isg-3.1.134269+, j-series-9.5+, mx-9.4+, srx-9.2+, srx-branch-9.4+, vsrx-12.1+ |
MODBUS: Overlong Packet
This anomaly triggers when it detects Modbus/MBAP Length-header value over 256 bytes. Modbus over TCP exists on top of MBAP header (6 bytes). It is strongly recommended that a TCP frame transports only one Modbus ADU.
References