CVE-2024-45056CWE-682

`fold (xor (shl 1, x), -1) -> (rotl ~1, x)` misoptimization in zksolc

Medium · published August 29, 2024

CVSS v3.1
5.9
EPSS
0%
Percentile
33.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00403 · 33.4th percentile
Weakness
CWE-682 · Incorrect Calculation
Published
2024-08-29T16:55Z
EPSS history
Timeline
  • 29 AUG 16:55Z
    `fold (xor (shl 1, x), -1) -> (rotl ~1, x)` misoptimization in zksolc
    cvelistv5