Vulnerability CVE-2023-30629
Published: 2023-04-24   Modified: 2023-04-25

Description:
Vyper is a Pythonic Smart Contract Language for the ethereum virtual machine. In versions 0.3.1 through 0.3.7, the Vyper compiler generates the wrong bytecode. Any contract that uses the `raw_call` with `revert_on_failure=False` and `max_outsize=0` receives the wrong response from `raw_call`. Depending on the memory garbage, the result can be either `True` or `False`. A patch is available and, as of time of publication, anticipated to be part of Vyper 0.3.8. As a workaround, one may always put `max_outsize>0`.

Type:

CWE-670

 (Always-Incorrect Control Flow Implementation)

 References:
https://docs.vyperlang.org/en/v0.3.7/built-in-functions.html#raw_call
https://github.com/lidofinance/gate-seals/pull/5/files
https://github.com/lidofinance/gate-seals/blob/051593e74df01a4131c485b4fda52e691cd4b7d8/contracts/GateSeal.vy#L164
https://github.com/vyperlang/vyper/security/advisories/GHSA-w9g2-3w7p-72g9
https://github.com/vyperlang/vyper/commit/851f7a1b3aa2a36fd041e3d0ed38f9355a58c8ae
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