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Fuzzing problem #90

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LJYSnails opened this issue Nov 27, 2019 · 4 comments
Open

Fuzzing problem #90

LJYSnails opened this issue Nov 27, 2019 · 4 comments

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@LJYSnails
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Access denied by device during fuzz test when establishing connection with Siemens PLC
@BinyaminSharet
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Can you elaborate?

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@dark-lbp
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Siemens PlC has max connections limit, is that cause the problem?

@LJYSnails
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Can you elaborate?

Sent with GitHawk
At present, the S7-1200 uses the S7comm plus protocol. This program is the S7comm protocol. There is a certain difference in structure between the two. The PLC sends a random number to the 25th byte of the TIA software data. The value of the random byte is between 0x06 and 0x7f. The 24th and 29th bytes in the data returned by the TIA software are random numbers. Add 0x80 to the section.

@LJYSnails
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Siemens PlC has max connections limit, is that cause the problem?
no

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@BinyaminSharet @dark-lbp @LJYSnails