Improper Input Validation Affecting vyper package, versions [0.3.4,0.4.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PYTHON-VYPER-6674048
- published26 Apr 2024
- disclosed25 Apr 2024
- creditcyberthirst
Introduced: 25 Apr 2024
CVE-2024-32646 (opens in a new tab)How 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 Input Validation due to the use of slice builtin can result in a double eval vulnerability when the buffer argument is either msg.data, self.code or
.code and either the start or length arguments have side-effects.PoC
l: DynArray[uint256, 10]
@external
def foo(cs: String[64]) -> uint256:
for i in range(10):
self.l.append(1)
assert len(self.l) == 10
s: Bytes[64] = b""
s = slice(msg.data, self.l.pop(), 3)
assert len(self.l) == 10 - 2
return len(self.l)