Vulnerability · Published Apr 24, 2023 · Assigned by GitHub_M

CVE-2023-30629Vyper's raw_call with outsize=0 and revert_on_failure=False returns incorrect success value

High 7.5

In plain English

A high-severity security flaw in vyper from vyperlang. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.9%top 40.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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`.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	vyper	0.3.8	GHSA-w9g2-3w7p-72g9
PyPI	vyper	0.3.8	PYSEC-2023-131

Affected products (as reported)

Vendor	Product	Versions
vyperlang	vyper	>= 0.3.1, <= 0.3.7

Weakness: CWE-670 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

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