CVE-2023-30629

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CVE-2023-30629

Summary: Vyper's raw_call with outsize=0 and revert_on_failure=False returns incorrect success value

Details: 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`.

References: https://docs.vyperlang.org/en/v0.3.7/built-in-functions.html#raw_call, https://github.com/lidofinance/gate-seals/blob/051593e74df01a4131c485b4fda52e691cd4b7d8/contracts/GateSeal.vy#L164, https://github.com/lidofinance/gate-seals/pull/5/files, https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/30xxx/CVE-2023-30629.json, https://github.com/vyperlang/vyper/security/advisories/GHSA-w9g2-3w7p-72g9, https://nvd.nist.gov/vuln/detail/CVE-2023-30629, https://github.com/vyperlang/vyper/commit/851f7a1b3aa2a36fd041e3d0ed38f9355a58c8ae