CVE-2024-24567: vyper — Exploit & Fix

Description

Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. Vyper compiler allows passing a value in builtin raw_call even if the call is a delegatecall or a staticcall. But in the context of delegatecall and staticcall the handling of value is not possible due to the semantics of the respective opcodes, and vyper will silently ignore the value= argument. If the semantics of the EVM are unknown to the developer, he could suspect that by specifying the `value` kwarg, exactly the given amount will be sent along to the target. This vulnerability affects 0.3.10 and earlier versions.

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CVSS v3.1 Score

4.8

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

Weakness Type (CWE)

CWE-754 CWE-754

Affected Products

Vendor	Product	Versions
vyperlang	vyper	< 0.3.10

References

Advisories & Patches

https://github.com/vyperlang/vyper/security/advisories/GHSA-x2c2-q32w-4w6m https://github.com/vyperlang/vyper/security/advisories/GHSA-x2c2-q32w-4w6m

Exploits

https://github.com/vyperlang/vyper/blob/9136169468f317a53b4e7448389aa315f90b95ba/vyper/builtins/functions.py#L1100 https://github.com/vyperlang/vyper/security/advisories/GHSA-x2c2-q32w-4w6m https://github.com/vyperlang/vyper/blob/9136169468f317a53b4e7448389aa315f90b95ba/vyper/builtins/functions.py#L1100 https://github.com/vyperlang/vyper/security/advisories/GHSA-x2c2-q32w-4w6m

Frequently Asked Questions

What is CVE-2024-24567? +

Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. Vyper compiler allows passing a value in builtin raw_call even if the call is a delegatecall or a staticcall. But in the context of delegatecall and staticcall the handling of value is not possible due to the semantics of the respective opcodes, and vyper will silently ignore the value= argument. If the semantics of the EVM are unknown to the developer, he could suspect that by specifying the `value` kwarg, exactly the given amount will be sent along to the target. This vulnerability affects 0.3.10 and earlier versions. It has a CVSS v3.1 base score of 4.8 (MEDIUM).

How severe is CVE-2024-24567? +

CVE-2024-24567 has a CVSS v3.1 score of 4.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-24567? +

CVE-2024-24567 affects products from vyperlang, specifically: vyper. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-24567? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2024-24567