Vulnerability · Published Apr 25, 2024 · Assigned by GitHub_M
CVE-2024-32646vyper performs double eval of the slice args when buffer from adhoc locations
Medium 5.3
In plain English
A medium-severity improper input validation in vyper from vyperlang. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, using the `slice` builtin can result in a double eval vulnerability when the buffer argument is either `msg.data`, `self.code` or `<address>.code` and either the `start` or `length` arguments have side-effects. It can be easily triggered only with the versions `<0.3.4` as `0.3.4` introduced the unique symbol fence. No vulnerable production contracts were found. Additionally, double evaluation of side-effects should be easily discoverable in client tests. As such, the impact is low. As of time of publication, no fixed versions are available.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | vyper | 0.4.0 | GHSA-r56x-j438-vw5m |
| PyPI | vyper | 0.4.0 | PYSEC-2024-207 |
Affected products (as reported)
Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
References
- https://github.com/vyperlang/vyper/security/advisories/GHSA-r56x-j438-vw5m x_refsource_CONFIRM