CVE-2024-43366: zkvyper — Exploit

Description

zkvyper is a Vyper compiler. Starting in version 1.3.12 and prior to version 1.5.3, since LLL IR has no Turing-incompletness restrictions, it is compiled to a loop with a much more late exit condition. It leads to a loss of funds or other unwanted behavior if the loop body contains it. However, more real-life use cases like iterating over an array are not affected. No contracts were affected by this issue, which was fixed in version 1.5.3. Upgrading and redeploying affected contracts is the only way to avoid the vulnerability.

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CVSS v3.1 Score

7.5

HIGH

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

Weakness Type (CWE)

CWE-835 CWE-835

Affected Products

Vendor	Product	Versions
matter-labs	zkvyper	1.3.12 — 1.5.3

References

Exploits

https://github.com/matter-labs/era-compiler-vyper/security/advisories/GHSA-8j77-7rrv-6pxx

Frequently Asked Questions

What is CVE-2024-43366? +

zkvyper is a Vyper compiler. Starting in version 1.3.12 and prior to version 1.5.3, since LLL IR has no Turing-incompletness restrictions, it is compiled to a loop with a much more late exit condition. It leads to a loss of funds or other unwanted behavior if the loop body contains it. However, more real-life use cases like iterating over an array are not affected. No contracts were affected by this issue, which was fixed in version 1.5.3. Upgrading and redeploying affected contracts is the only way to avoid the vulnerability. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2024-43366? +

CVE-2024-43366 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-43366? +

CVE-2024-43366 affects products from matter-labs, specifically: zkvyper. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-43366? +

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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