OpenZeppelin Contracts TransparentUpgradeableProxy clashing selector calls may not be delegated

CVE-2023-30541 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Impact

A function in the implementation contract may be inaccessible if its selector clashes with one of the proxy's own selectors. Specifically, if the clashing function has a different signature with incompatible ABI encoding, the proxy could revert while attempting to decode the arguments from calldata.

The probability of an accidental clash is negligible, but one could be caused deliberately.

Patches

The issue has been fixed in v4.8.3.

Workarounds

If a function appears to be inaccessible for this reason, it may be possible to craft the calldata such that ABI decoding does not fail at the proxy and the function is properly proxied through.

References

https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4154

Basic information

Type
reviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2023-04-17 16:45:21 UTC
Updated
2023-11-23 03:36:07 UTC
GitHub reviewed
2023-04-17 16:45:21 UTC
NVD published
2023-04-17 22:15:10 UTC

EPSS Score

Score Percentile
0.14% 34.13%

CVSS Scores

Base score Version Severity Vector
5.3 3.1 —
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.

Identifiers

Type Value
GHSA GHSA-mx2q-35m2-x2rh ↗
CVE CVE-2023-30541 ↗

CWEs

CWE id Name
CWE-436 Interpretation Conflict

Credits

  • MarkLee131 (analyst)

Affected packages (2)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
npm @openzeppelin/contracts >= 3.2.0, < 4.8.3 4.8.3 —
npm @openzeppelin/contracts-upgradeable >= 3.2.0, < 4.8.3 4.8.3 —

References

cvelogic Threat Intelligence