CVE-2024-32647
published 2024-04-25CVE-2024-32647: Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, using the `create_from_blueprint` builtin can…
PriorityP429medium5.3CVSS 3.1
AVNACLPRNUINSUCNILAN
EPSS
0.45%
36.3th percentile
Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, using the `create_from_blueprint` builtin can result in a double eval vulnerability when `raw_args=True` and the `args` argument has side-effects. It can be seen that the `_build_create_IR` function of the `create_from_blueprint` builtin doesn't cache the mentioned `args` argument to the stack. As such, it can be evaluated multiple times (instead of retrieving the value from the stack). 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 exist.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| vyperlang | vyper | < 0.4.0 | 0.4.0 |
| vyperlang | vyper | <= 0.3.10 | — |
| vyperlang | vyper | >= 0 < 0.4.0 | 0.4.0 |
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OSV
CVE-2024-32647: Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine
osv·2024-04-25
CVE-2024-32647 CVE-2024-32647: Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine
Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, using the `create_from_blueprint` builtin can result in a double eval vulnerability when `raw_args=True` and the `args` argument has side-effects. It can be seen that the `_build_create_IR` function of the `create_from_blueprint` builtin doesn't cache the mentioned `args` argument to the stack. As such, it can be evaluated multiple times (instead of retrieving the value from the stack). 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 exist.
GHSA
vyper performs double eval of raw_args in create_from_blueprint
ghsa·2024-04-25
CVE-2024-32647 [MEDIUM] CWE-95 vyper performs double eval of raw_args in create_from_blueprint
vyper performs double eval of raw_args in create_from_blueprint
### Summary
Using the `create_from_blueprint` builtin can result in a double eval vulnerability when `raw_args=True` and the `args` argument has side-effects.
A contract search was performed and no vulnerable contracts were found in production. In particular, the `raw_args` variant of `create_from_blueprint` was not found to be used in production.
### Details
It can be seen that the `_build_create_IR` function of the `create_from_blueprint` builtin doesn't cache the mentioned `args` argument to the stack: https://github.com/vyperlang/vyper/blob/cedf7087e68e67c7bfbd47ae95dcb16b81ad2e02/vyper/builtins/functions.py#L1847
As such, it can be evaluated multiple times (instead of retrieving the value from the stack).
### PoC
The
OSV
vyper performs double eval of raw_args in create_from_blueprint
osv·2024-04-25
CVE-2024-32647 [MEDIUM] vyper performs double eval of raw_args in create_from_blueprint
vyper performs double eval of raw_args in create_from_blueprint
### Summary
Using the `create_from_blueprint` builtin can result in a double eval vulnerability when `raw_args=True` and the `args` argument has side-effects.
A contract search was performed and no vulnerable contracts were found in production. In particular, the `raw_args` variant of `create_from_blueprint` was not found to be used in production.
### Details
It can be seen that the `_build_create_IR` function of the `create_from_blueprint` builtin doesn't cache the mentioned `args` argument to the stack: https://github.com/vyperlang/vyper/blob/cedf7087e68e67c7bfbd47ae95dcb16b81ad2e02/vyper/builtins/functions.py#L1847
As such, it can be evaluated multiple times (instead of retrieving the value from the stack).
### PoC
The
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/vyperlang/vyper/blob/cedf7087e68e67c7bfbd47ae95dcb16b81ad2e02/vyper/builtins/functions.py#L1847https://github.com/vyperlang/vyper/security/advisories/GHSA-3whq-64q2-qfj6https://github.com/vyperlang/vyper/blob/cedf7087e68e67c7bfbd47ae95dcb16b81ad2e02/vyper/builtins/functions.py#L1847https://github.com/vyperlang/vyper/security/advisories/GHSA-3whq-64q2-qfj6
2024-04-25
Published