CVE-2023-23940: OpenZeppelin Contracts for Cairo is vulnerable to signature validation bypass
First published: Thu Feb 02 2023(Updated: )
### Cause `is_valid_eth_signature` is missing a call to `finalize_keccak` after calling `verify_eth_signature`. ### Impact As a result, any contract using `is_valid_eth_signature` from the account library (such as the `EthAccount` preset) is vulnerable to a malicious sequencer. Specifically, the malicious sequencer would be able to bypass signature validation to impersonate an instance of these accounts. ### Risk In order to exploit this vulnerability, it is required to control a sequencer or prover since they're the ones executing the hints, being able to inject incorrect keccak results. Today StarkWare is the only party running both a prover or a sequencer, greatly reducing the risk of exploit. ### Patches The issue has been patched in 0.6.1. ### For more information If you have any questions or comments about this advisory: * Open an issue in [the Contracts for Cairo repository](https://github.com/OpenZeppelin/cairo-contracts/issues/new/choose) * Email us at [security@openzeppelin.com](mailto:security@openzeppelin.com)
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/openzeppelin-cairo-contracts | >=0.2.0<0.6.1 | 0.6.1 |
| OpenZeppelin Contracts | >=0.2.0<0.6.1 |
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Reference Links
- https://github.com/OpenZeppelin/cairo-contracts/pull/542/commits/6d4cb750478fca2fd916f73297632f899aca9299
- https://github.com/OpenZeppelin/cairo-contracts/security/advisories/GHSA-626q-v9j4-mcp4
- https://nvd.nist.gov/vuln/detail/CVE-2023-23940
- https://github.com/pypa/advisory-database/tree/main/vulns/openzeppelin-cairo-contracts/PYSEC-2023-39.yaml
- https://github.com/advisories/GHSA-626q-v9j4-mcp4 (Advisory)
Frequently Asked Questions
What is CVE-2023-23940?
CVE-2023-23940 is a vulnerability in OpenZeppelin Contracts for Cairo, a library for secure smart contract development.
What is the severity of CVE-2023-23940?
The severity of CVE-2023-23940 is medium, with a severity value of 5.3.
Which software is affected by CVE-2023-23940?
OpenZeppelin Contracts for Cairo versions 0.2.0 to 0.6.1 are affected by CVE-2023-23940.
What is the CWE ID for CVE-2023-23940?
The CWE ID for CVE-2023-23940 is 347 and 345.
How can I fix CVE-2023-23940?
To fix CVE-2023-23940, update OpenZeppelin Contracts for Cairo to a version that includes the fix.
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