Integer Overflow or Wraparound Affecting vyper package, versions [,0.3.8)


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.12% (48th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-PYTHON-VYPER-5529833
  • published12 May 2023
  • disclosed12 May 2023
  • credittrocher

Introduced: 12 May 2023

CVE-2023-32058  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

Upgrade vyper to version 0.3.8 or higher.

Overview

vyper is a Pythonic Smart Contract Language for the EVM.

Affected versions of this package are vulnerable to Integer Overflow or Wraparound due to a missing check on the upper bound in loops of the form for i in range(a, a + N). (In loops like for i in range(start, stop) and for i in range(stop), the compiler is able to raise a TypeMismatch when trying to overflow the variable.)

PoC

@external
def test() -> uint16:
    x:uint8 = 255
    a:uint8 = 0
    for i in range(x, x+2):
        a = i
    return convert(a,uint16)  # returns 256

References

CVSS Scores

version 3.1