Out-of-bounds Write Affecting vyper package, versions [,0.3.8)
Threat Intelligence
Exploit Maturity
Proof of concept
EPSS
0.12% (47th
percentile)
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Test your applications- Snyk ID SNYK-PYTHON-VYPER-5529832
- published 12 May 2023
- disclosed 12 May 2023
- credit Unknown
Introduced: 12 May 2023
CVE-2023-31146 Open this link in a new tabHow 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 Out-of-bounds Write when assigning values to a dynarray whose source is the same dynarray. In that case, the length word of the dynarray is written before the data. The issue can cause data corruption across call frames.
PoC
@external
def should_revert() -> DynArray[uint256,3]:
a: DynArray[uint256, 3] = [1, 2, 3]
a = empty(DynArray[uint256, 3])
a = [self.a[0], self.a[1], self.a[2]]
return a # if bug: returns [1,2,3]
References
CVSS Scores
version 3.1