High severity · published Apr 24, 2023
CVE-2023-30629
Vyper's raw_call with outsize=0 and revert_on_failure=False returns incorrect success value
7.5
CVSS
0.9%
EPSS
No
On KEV
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`.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 59% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VY
vyper · vyperlang
>= 0.3.1, <= 0.3.7 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-30629
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-30629
Product
https://docs.vyperlang.org/en/v0.3.7/built-in-functions.html#raw_call
Product
https://github.com/lidofinance/gate-seals/blob/051593e74df01a4131c485b4fda52e691cd4b7d8/contracts/GateSeal.vy#L164
Patch
https://github.com/lidofinance/gate-seals/pull/5/files
Patch
https://github.com/vyperlang/vyper/commit/851f7a1b3aa2a36fd041e3d0ed38f9355a58c8ae
Exploit
https://github.com/vyperlang/vyper/security/advisories/GHSA-w9g2-3w7p-72g9
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