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CVE-2023-32675

LOW
Published 2023-05-19T19:46:18.047Z
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CVSS Score

V3.1
3.7
/10
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2023.03.01
0.001
probability
of exploitation in the wild

There is a 0.1% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-01-25
Exploit Probability
Percentile: 0.352
Higher than 35.2% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
LOW
Availability
NONE

Description

Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. In contracts with more than one regular nonpayable function, it is possible to send funds to the default function, even if the default function is marked `nonpayable`. This applies to contracts compiled with vyper versions prior to 0.3.8. This issue was fixed by the removal of the global `calldatasize` check in commit `02339dfda`. Users are advised to upgrade to version 0.3.8. Users unable to upgrade should avoid use of nonpayable default functions.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

vyperlang

vyper

Affected Versions:

< 0.3.8

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed MODERATE

Vyper's nonpayable default functions are sometimes payable

GHSA-vxmm-cwh2-q762

Advisory Details

### Impact in contracts with at least one regular nonpayable function, due to the callvalue check being inside of the selector section, it is possible to send funds to the default function by using less than 4 bytes of calldata, even if the default function is marked `nonpayable`. this applies to contracts compiled with vyper<=0.3.7. ```vyper # @version 0.3.7 # implicitly nonpayable @external def foo() -> uint256: return 1 # implicitly nonpayable @external def __default__(): # could receive ether here pass ``` ### Patches this was fixed by the removal of the global calldatasize check in https://github.com/vyperlang/vyper/commit/02339dfda0f3caabad142060d511d10bfe93c520. ### Workarounds don't use nonpayable default functions

Affected Packages

PyPI vyper
ECOSYSTEM: ≥0 <0.3.8

CVSS Scoring

CVSS Score

5.0

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

References

WEB https://github.com/vyperlang/vyper/security/advisories/GHSA-vxmm-cwh2-q762
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2023-32675
WEB https://github.com/vyperlang/vyper/commit/02339dfda0f3caabad142060d511d10bfe93c520
WEB https://github.com/vyperlang/vyper/commit/02339dfda0f3caabad142060d511d10bfe93c520.
WEB https://github.com/vyperlang/vyper/commit/903727006c1e5ebef99fa9fd5d51d62bd33d72a9
WEB https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2023-80.yaml
PACKAGE https://github.com/vyperlang/vyper

Advisory provided by GitHub Security Advisory Database. Published: May 22, 2023, Modified: November 19, 2024

References

https://github.com/vyperlang/vyper/security/advisories/GHSA-vxmm-cwh2-q762
https://github.com/vyperlang/vyper/commit/02339dfda0f3caabad142060d511d10bfe93c520
Published: 2023-05-19T19:46:18.047Z
Last Modified: 2025-02-12T16:36:34.945Z
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