Incorrect Comparison Affecting vyper package, versions [0,0.3.2)


0.0
medium

Snyk CVSS

    Attack Complexity High
    Integrity High

    Threat Intelligence

    EPSS 0.06% (25th percentile)
Expand this section
NVD
7.5 high

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  • Snyk ID SNYK-PYTHON-VYPER-2440813
  • published 5 Apr 2022
  • disclosed 5 Apr 2022
  • credit Unknown

How to fix?

Upgrade vyper to version 0.3.2 or higher.

Overview

vyper is a Pythonic Smart Contract Language for the EVM.

Affected versions of this package are vulnerable to Incorrect Comparison where bytestrings can have dirty bytes in them, resulting in the word-for-word comparisons giving incorrect results. Even without dirty nonzero bytes, two bytestrings can compare to equal if one ends with "\x00" because there is no comparison of the length.

References