CVE-2023-37902
ecrecover can return undefined data if signature does not verify
Description
Vyper is a Pythonic programming language that targets the Ethereum Virtual Machine (EVM). Prior to version 0.3.10, the ecrecover precompile does not fill the output buffer if the signature does not verify. However, the ecrecover builtin will still return whatever is at memory location 0. This means that the if the compiler has been convinced to write to the 0 memory location with specially crafted data (generally, this can happen with a hashmap access or immutable read) just before the ecrecover, a signature check might pass on an invalid signature. Version 0.3.10 contains a patch for this issue.
How to fix CVE-2023-37902
To remediate CVE-2023-37902, upgrade the affected package to a fixed version below.
- —upgrade to 0.3.10 or later
- —upgrade to 019a37ab98ff53f04fecfadf602b6cd5ac748f7f or later
Is CVE-2023-37902 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 0.3.10
- from 0, < 019a37ab98ff53f04fecfadf602b6cd5ac748f7f | from 0, < 0.3.9
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |