Fuzzing problem

Open LJYSnails opened this issue 6 years ago • 4 comments

Access denied by device during fuzz test when establishing connection with Siemens PLC

Nov 27 '19 13:11 LJYSnails

Can you elaborate?

_{Sent with GitHawk}

Nov 27 '19 13:11 BinyaminSharet

Siemens PlC has max connections limit, is that cause the problem?

Nov 28 '19 00:11 dark-lbp

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.

Dec 03 '19 08:12 LJYSnails

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

Dec 03 '19 10:12 LJYSnails