high7.5

CVE-2023-30837

vyper vulnerable to storage allocator overflow

Impact

### 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?_

Affected packages

Ecosystem	Package	Affected	Fixed in
pip	`vyper`	< 0.3.8	0.3.8

Affected products

Vendor	Product	Affected versions
Vyperlang	Vyper	before 0.3.8

Weakness classification

CWE-789