Invalid Opcode Vulnerability in Py-EVM v0.2.0-alpha.33

CVE-2018-18920 · MEDIUM Severity

AV:N/AC:M/AU:N/C:P/I:P/A:P

Py-EVM v0.2.0-alpha.33 allows attackers to make a vm.execute_bytecode call that triggers computation._stack.values with '"stack": [100, 100, 0]' where b'\x' was expected, resulting in an execution failure because of an invalid opcode. This is reportedly related to "smart contracts can be executed indefinitely without gas being paid."

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