CVE-2023-39363
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.
| Software | From | Fixed in |
|---|---|---|
vyper
|
0.2.15 | 0.3.1 |
| vyperlang / vyper | 0.2.15 | 0.2.15.x |
| vyperlang / vyper | 0.2.16 | 0.2.16.x |
| vyperlang / vyper | 0.3.0 | 0.3.0.x |
- https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2023-142.yaml
- https://github.com/vyperlang/vyper/pull/2439
- https://github.com/vyperlang/vyper/pull/2514
- https://github.com/vyperlang/vyper/security/advisories/GHSA-5824-cm3x-3c38
- https://hackmd.io/@LlamaRisk/BJzSKHNjn
- https://hackmd.io/@vyperlang/HJUgNMhs2
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