CVE-2023-42441: Vyper has incorrect re-entrancy lock when key is empty string
First published: Mon Sep 18 2023(Updated: )
### Impact Locks of the type `@nonreentrant("")` or `@nonreentrant('')` do not produce reentrancy checks at runtime. ```Vyper @nonreentrant("") # unprotected @external def bar(): pass @nonreentrant("lock") # protected @external def foo(): pass ``` ### Patches Patched in #3605 ### Workarounds The lock name should be a non-empty string. ### References _Are there any links users can visit to find out more?_
Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Vyperlang Vyper | >=0.2.9<0.3.10 | |
| pip/vyper | >=0.2.9<0.3.10 | 0.3.10 |
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Reference Links
- https://github.com/vyperlang/vyper/commit/0b740280c1e3c5528a20d47b29831948ddcc6d83
- https://github.com/vyperlang/vyper/pull/3605
- https://github.com/vyperlang/vyper/security/advisories/GHSA-3hg2-r75x-g69m
- https://nvd.nist.gov/vuln/detail/CVE-2023-42441
- https://github.com/advisories/GHSA-3hg2-r75x-g69m (Advisory)
- https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2023-305.yaml
Frequently Asked Questions
What is CVE-2023-42441?
CVE-2023-42441 is a vulnerability in the Vyper smart contract language that allows reentrancy attacks.
What is the impact of CVE-2023-42441?
The impact of CVE-2023-42441 is that locks with the `@nonreentrant` decorator do not produce reentrancy checks at runtime, making the smart contract vulnerable to reentrancy attacks.
How do I fix CVE-2023-42441?
To fix CVE-2023-42441, update to Vyper version 0.3.10 or higher.
Where can I find more information about CVE-2023-42441?
You can find more information about CVE-2023-42441 at the following references: [Link 1](https://github.com/vyperlang/vyper/commit/0b740280c1e3c5528a20d47b29831948ddcc6d83), [Link 2](https://github.com/vyperlang/vyper/pull/3605), [Link 3](https://github.com/vyperlang/vyper/security/advisories/GHSA-3hg2-r75x-g69m).
What is the severity of CVE-2023-42441?
CVE-2023-42441 has a severity rating of 5.3 (medium).
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