CVE-2023-39363
Severity CVSS v4.0:
CRITICAL
Type:
Unavailable / Other
Publication date:
07/08/2023
Last modified:
11/10/2024
Description
Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine (EVM). In versions 0.2.15, 0.2.16 and 0.3.0, named re-entrancy locks are allocated incorrectly. Each function using a named re-entrancy lock gets a unique lock regardless of the key, allowing cross-function re-entrancy in contracts compiled with the susceptible versions. A specific set of conditions is required to result in misbehavior of affected contracts, specifically: a `.vy` contract compiled with `vyper` versions `0.2.15`, `0.2.16`, or `0.3.0`; a primary function that utilizes the `@nonreentrant` decorator with a specific `key` and does not strictly follow the check-effects-interaction pattern (i.e. contains an external call to an untrusted party before storage updates); and a secondary function that utilizes the same `key` and would be affected by the improper state caused by the primary function. Version 0.3.1 contains a fix for this issue.
Impact
Base Score 4.0
9.10
Severity 4.0
CRITICAL
Base Score 3.x
5.90
Severity 3.x
MEDIUM
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:a:vyperlang:vyper:0.2.15:*:*:*:*:python:*:* | ||
| cpe:2.3:a:vyperlang:vyper:0.2.16:*:*:*:*:python:*:* | ||
| cpe:2.3:a:vyperlang:vyper:0.3.0:*:*:*:*:python:*:* |
To consult the complete list of CPE names with products and versions, see this page