Vulnerability Description
zksolc is a Solidity compiler for ZKsync. All LLVM versions since 2015 fold `(xor (shl 1, x), -1)` to `(rotl ~1, x)` if run with optimizations enabled. Here `~1` is generated as an unsigned 64 bits number (`2^64-1`). This number is zero-extended to 256 bits on EraVM target while it should have been sign-extended. Thus instead of producing `roti 2^256 - 1, x` the compiler produces `rotl 2^64 - 1, x`. Analysis has shown that no contracts were affected by the date of publishing this advisory. This issue has been addressed in version 1.5.3. Users are advised to upgrade and redeploy all contracts. There are no known workarounds for this vulnerability.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Matter-Labs | Zksolc | < 1.5.3 |
Related Weaknesses (CWE)
References
- https://github.com/llvm/llvm-project/commit/e48237df95b49a36b8ffceb78c8a58f4be1bPatch
- https://github.com/matter-labs/era-compiler-solidity/security/advisories/GHSA-fpVendor Advisory
FAQ
What is CVE-2024-45056?
CVE-2024-45056 is a vulnerability with a CVSS score of 5.9 (MEDIUM). zksolc is a Solidity compiler for ZKsync. All LLVM versions since 2015 fold `(xor (shl 1, x), -1)` to `(rotl ~1, x)` if run with optimizations enabled. Here `~1` is generated as an unsigned 64 bits nu...
How severe is CVE-2024-45056?
CVE-2024-45056 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2024-45056?
Check the references section above for vendor advisories and patch information. Affected products include: Matter-Labs Zksolc.