Buffer Overflow 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-6277566
- published 27 Feb 2024
- disclosed 26 Feb 2024
- credit minaminao-osec
Introduced: 26 Feb 2024
CVE-2024-26149 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 Buffer Overflow due to the improper handling of excessively large values specified as the starting index for an array in _abi_decode. This can cause the read position to overflow, leading to the decoding of values outside the intended array bounds.
PoC
event Pwn:
pass
@external
def f(x: Bytes[32 * 3]):
a: Bytes[32] = b"foo"
y: Bytes[32 * 3] = x
decoded_y1: Bytes[32] = _abi_decode(y, Bytes[32])
a = b"bar"
decoded_y2: Bytes[32] = _abi_decode(y, Bytes[32])
if decoded_y1 != decoded_y2:
log Pwn()
CVSS Scores
version 3.1