CVE-2023-30629

Advisory

Vyper 0.3.8 includes a fix for CVE-2023-30629: 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'.
https://github.com/vyperlang/vyper/security/advisories/GHSA-w9g2-3w7p-72g9

Affected package

Affected versions

Fixed versions

Vulnerability changelog

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`. See CVE-2023-30629.


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

Resources

• https://docs.vyperlang.org/en/v0.3.7/built-in-functions.html#raw_call
• https://github.com/lidofinance/gate-seals/blob/051593e74df01a4131c485b4fda52e691cd4b7d8/contracts/Ga
• https://github.com/lidofinance/gate-seals/pull/5/files
• https://github.com/vyperlang/vyper/commit/851f7a1b3aa2a36fd041e3d0ed38f9355a58c8ae
• https://github.com/vyperlang/vyper/security/advisories/GHSA-w9g2-3w7p-72g9
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-30629
• https://github.com/lidofinance/gate-seals/blob/051593e74df01a4131c485b4fda52e691cd4b7d8/contracts/GateSeal.vy#L164