GitHub Advisoryadvisory · PyPI

GHSA-mgv8-gggw-mrg6 vyper vulnerable to storage allocator overflow

HIGH Published 2023-05-05 Modified 2024-11-19 Official page ↗
Aliases
CVE-2023-30837
Ecosystem
PyPI
Packages
vyper
Severity
High
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weaknesses
CWE-789
Reviewed
2023-05-05

Affected packages

• PyPI vyper: < 0.3.8 → fixed in 0.3.8

Description

Impact The storage allocator does not guard against allocation overflows. This can result in vulnerabilities like the following: ```vyper owner: public(address) take_up_some_space: public(uint256[10]) buffer: public(uint256[max_value(uint256)]) @external def initialize(): self.owner = msg.sender @external def foo(idx: uint256, data: uint256): self.buffer[idx] = data ``` Per @toonvanhove, "An attacker can overwrite the owner variable by calling this contract with calldata: `0x04bc52f8 fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff5 ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff` (spaces inserted for readability) `0x04bc52f8` is the selector for `foo(uint256, uint256)`, and the last argument `fff...fff` is the new value for the owner variable." Patches patched in 0bb7203b584e771b23536ba065a6efda457161bb Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_ References _Are there any links users can visit to find out more?_

Related

Alias · CVE (1)

  • CVE-2023-30837 Vyper is a pythonic smart contract language for the EVM. vulnerability

Weakness · CWE (1)

  • CWE-789 Memory Allocation with Excessive Size Value weakness

References