Improper Input Validation Affecting vyper package, versions [0,0.4.0)
Threat Intelligence
Exploit Maturity
Proof of concept
EPSS
0.04% (10th
percentile)
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Test your applications- Snyk ID SNYK-PYTHON-VYPER-6674049
- published 26 Apr 2024
- disclosed 25 Apr 2024
- credit Robert Chen
Introduced: 25 Apr 2024
CVE-2024-32645 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 build_IR function of the RawLog class failing to properly unwrap the variables provided as topics. Consequently, incorrect values can be logged which may result in unexpected behavior in client-side applications relying on these logs.
PoC
x: bytes32
@external
def f():
self.x = 0x1234567890123456789012345678901234567890123456789012345678901234
raw_log([self.x], b"") # LOG1(offset:0x60, size:0x00, topic1:0x00)
y: bytes32 = 0x1234567890123456789012345678901234567890123456789012345678901234
raw_log([y], b"") # LOG1(offset:0x80, size:0x00, topic1:0x40)
References
CVSS Scores
version 3.1