CVE-2023-42460: _abi_decode input not validated in complex expressions in Vyper
First published: Tue Sep 26 2023(Updated: )
### Impact `_abi_decode()` does not validate input when it is nested in an expression. the following example gets correctly validated (bounds checked): ```vyper x: int128 = _abi_decode(slice(msg.data, 4, 32), int128) ``` however, the following example is not bounds checked ```vyper @external def abi_decode(x: uint256) -> uint256: a: uint256 = convert(_abi_decode(slice(msg.data, 4, 32), (uint8)), uint256) + 1 return a # abi_decode(256) returns: 257 ``` the issue can be triggered by constructing an example where the output of `_abi_decode` is not internally passed to `make_setter` (an internal codegen routine) or other input validating routine. ### Patches https://github.com/vyperlang/vyper/pull/3626 ### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_ ### References _Are there any links users can visit to find out more?_
Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Vyperlang Vyper | >=0.3.4<0.3.10 | |
| pip/vyper | >=0.3.4<0.3.10 | 0.3.10 |
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Reference Links
- https://github.com/vyperlang/vyper/pull/3626
- https://github.com/vyperlang/vyper/security/advisories/GHSA-cx2q-hfxr-rj97
- https://nvd.nist.gov/vuln/detail/CVE-2023-42460
- https://github.com/advisories/GHSA-cx2q-hfxr-rj97 (Advisory)
- https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2023-191.yaml
Frequently Asked Questions
What is the impact of CVE-2023-42460?
`_abi_decode()` does not validate input when it is nested in an expression, allowing potential security vulnerabilities.
Which software is affected by CVE-2023-42460?
Vyper versions between 0.3.4 and 0.3.10 are affected.
How can I fix CVE-2023-42460?
Update the Vyper package to version 0.3.10 or apply the appropriate remedy.
Where can I find more information about CVE-2023-42460?
You can find more information about CVE-2023-42460 on the GitHub security advisory page: [link](https://github.com/vyperlang/vyper/security/advisories/GHSA-cx2q-hfxr-rj97).
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