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RE: Steemd 0.20.6 bug - memory exhaustion when parsing malicious hello_message
I thought that custom_json ops didn't use the C++ variant type, but just a JSON string. There is a bug in the JSON parser, but not an exploitable one in the way it is used. But I haven't looked at that in detail, it would certainly be good to understand what sort of things somebody could insert using a custom_json operation.
You're right about the custom_json not using the varint type, this is indeed just a string. The
witness_set_properties.propsfield might be a candidate, though? Looking forward to more fuzzing results from you :)