GitHub Advisoryadvisory · PyPI
GHSA-mgv8-gggw-mrg6 vyper vulnerable to storage allocator overflow
HIGH
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
- https://github.com/vyperlang/vyper/security/advisories/GHSA-mgv8-gggw-mrg6 web
- https://nvd.nist.gov/vuln/detail/CVE-2023-30837 advisory
- https://github.com/vyperlang/vyper/commit/0bb7203b584e771b23536ba065a6efda457161bb web
- https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2023-76.yaml web
- https://github.com/vyperlang/vyper package