Improper Validation of Array Index Affecting vyper package, versions [0,0.4.0)
Threat Intelligence
Exploit Maturity
Proof of concept
EPSS
0.07% (32nd
percentile)
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Test your applications- Snyk ID SNYK-PYTHON-VYPER-6231774
- published 8 Feb 2024
- disclosed 7 Feb 2024
- credit cyberthirst
Introduced: 7 Feb 2024
CVE-2024-24563 Open this link in a new tabHow to fix?
Upgrade vyper to version 0.4.0 or higher.
Overview
vyper is a Pythonic Smart Contract Language for the EVM.
Affected versions of this package are vulnerable to Improper Validation of Array Index due to the handling of array indexes. An attacker can cause unpredictable behavior or access inaccessible elements by using signed integers as indexes for arrays, which bypasses the bounds checker under certain conditions.
Note:
This is only exploitable if the array is sufficiently large and the negative index is small enough in magnitude to pass the bounds checker.
PoC
arr: public(uint256[MAX_UINT256])
@external
def set(idx: int256, num: uint256):
self.arr[idx] = num
References
CVSS Scores
version 3.1