CVE-2018-18920: ethereum py-evm

Vulnerability summary

CVE-2018-18920 is a high (CVSS 8.8) vulnerability in ethereum py-evm. EPSS estimates a 2.93% chance of exploitation in the next 30 days, higher than 86.9% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 12-11-2018
   PublishedVulnerability first disclosed.
2. 05-08-2024
   Last modifiedVulnerability information updated.

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."

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.