Improper Input Validation Affecting vyper package, versions [0.3.4,0.4.0)
Threat Intelligence
Exploit Maturity
Proof of concept
EPSS
0.04% (11th
percentile)
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Test your applications- Snyk ID SNYK-PYTHON-VYPER-6674048
- published 26 Apr 2024
- disclosed 25 Apr 2024
- credit cyberthirst
Introduced: 25 Apr 2024
CVE-2024-32646 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 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)
References
CVSS Scores
version 3.1