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ethereum/py-evm · Security

Py-EVM is vulnerable to arbitrary bytecode injection

GHSA ID
GHSA-vqgp-4jgj-5j64
CVE ID
CVE-2018-18920
Severity
high
Published
Updated
CVSS
8.8 · CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v3
8.8 · CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Description

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."

CWEs

  • CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

References