GHSA-mgv8-gggw-mrg6

ghsaUSosv

vyper vulnerable to storage allocator overflow

Advisory ansehen veröffentlicht 2023-05-05Lizenz: CC-BY-4.0

### 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?_

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beschreibt (1)

Zugehörige CVEs.

IDSchweregrad ausnutzbar
CVE-2023-30837UShigh7.5—
Vyper is a pythonic smart contract language for the EVM. The storage allocator does not guard against allocation overflows in versions prior to 0.3.8. An attacker can overwrite the…
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Referenzen

Externe Belege — Patches, Meldungen, Analysen.

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