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.
History

Tue, 03 Sep 2024 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Matter-labs zksolc
CPEs cpe:2.3:a:matter-labs:zksolc:*:*:*:*:*:*:*:*
Vendors & Products Matter-labs zksolc

Thu, 29 Aug 2024 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Matter-labs
Matter-labs era-compiler-solidity
CPEs cpe:2.3:a:matter-labs:era-compiler-solidity:*:*:*:*:*:*:*:*
Vendors & Products Matter-labs
Matter-labs era-compiler-solidity
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 29 Aug 2024 17:00:00 +0000

Type Values Removed Values Added
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.
Title `fold (xor (shl 1, x), -1) -> (rotl ~1, x)` misoptimization in zksolc
Weaknesses CWE-682
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2024-08-29T16:55:53.281Z

Updated: 2024-08-29T17:16:47.076Z

Reserved: 2024-08-21T17:53:51.332Z

Link: CVE-2024-45056

cve-icon Vulnrichment

Updated: 2024-08-29T17:16:42.609Z

cve-icon NVD

Status : Analyzed

Published: 2024-08-29T17:15:09.173

Modified: 2024-09-03T15:14:54.877

Link: CVE-2024-45056

cve-icon Redhat

No data.