CVE-2024-22419: vyper Buffer Overflow

Description

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. The `concat` built-in can write over the bounds of the memory buffer that was allocated for it and thus overwrite existing valid data. The root cause is that the `build_IR` for `concat` doesn't properly adhere to the API of copy functions (for `>=0.3.2` the `copy_bytes` function). A contract search was performed and no vulnerable contracts were found in production. The buffer overflow can result in the change of semantics of the contract. The overflow is length-dependent and thus it might go unnoticed during contract testing. However, certainly not all usages of concat will result in overwritten valid data as we require it to be in an internal function and close to the return statement where other memory allocations don't occur. This issue has been addressed in 0.4.0.

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CVSS v3.1 Score

7.3

HIGH

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

Weakness Type (CWE)

CWE-120 CWE-120

CWE-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
vyperlang	vyper	< 0.3.10

References

Advisories & Patches

https://github.com/vyperlang/vyper/commit/55e18f6d128b2da8986adbbcccf1cd59a4b9ad6f https://github.com/vyperlang/vyper/issues/3737 https://github.com/vyperlang/vyper/security/advisories/GHSA-2q8v-3gqq-4f8p https://github.com/vyperlang/vyper/commit/55e18f6d128b2da8986adbbcccf1cd59a4b9ad6f https://github.com/vyperlang/vyper/issues/3737 https://github.com/vyperlang/vyper/security/advisories/GHSA-2q8v-3gqq-4f8p

Exploits

https://github.com/vyperlang/vyper/issues/3737 https://github.com/vyperlang/vyper/security/advisories/GHSA-2q8v-3gqq-4f8p https://github.com/vyperlang/vyper/issues/3737 https://github.com/vyperlang/vyper/security/advisories/GHSA-2q8v-3gqq-4f8p

Frequently Asked Questions

What is CVE-2024-22419? +

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. The `concat` built-in can write over the bounds of the memory buffer that was allocated for it and thus overwrite existing valid data. The root cause is that the `build_IR` for `concat` doesn't properly adhere to the API of copy functions (for `>=0.3.2` the `copy_bytes` function). A contract search was performed and no vulnerable contracts were found in production. The buffer overflow can result in the change of semantics of the contract. The overflow is length-dependent and thus it might go unnoticed during contract testing. However, certainly not all usages of concat will result in overwritten valid data as we require it to be in an internal function and close to the return statement where other memory allocations don't occur. This issue has been addressed in 0.4.0. It has a CVSS v3.1 base score of 7.3 (HIGH).

How severe is CVE-2024-22419? +

CVE-2024-22419 has a CVSS v3.1 score of 7.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-22419? +

CVE-2024-22419 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-2024-22419? +

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-2024-22419