high
7.5
CWE
683
Advisory Published
Advisory Published
Updated

CVE-2023-32059: Vyper vulnerable to incorrect ordering of arguments for kwargs passed to internal calls

First published: Thu May 11 2023(Updated: )

### Impact Internal calls to internal functions with more than 1 default argument are compiled incorrectly. Depending on the number of arguments provided in the call, the defaults are added not right-to-left, but left-to-right. If the types are incompatible, typechecking is bypassed. In the `bar()` function in the following code, `self.foo(13)` is compiled to `self.foo(13,12)` instead of `self.foo(13,1337)`. ```vyper @internal def foo(a:uint256 = 12, b:uint256 = 1337): pass @internal def bar(): self.foo(13) ``` note that at the time of publication, the ability to pass kwargs to internal functions is an undocumented feature that does not seem to be widely used. ### Patches patched in c3e68c302aa6e1429946473769dd1232145822ac ### 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 SoftwareAffected VersionHow to fix
Vyperlang Vyper<0.3.8
pip/vyper<0.3.8
0.3.8

Remedy

https://github.com/vyperlang/vyper/commit/c3e68c302aa6e1429946473769dd1232145822ac

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Reference Links

Frequently Asked Questions

  • What is CVE-2023-32059?

    CVE-2023-32059 is a vulnerability in the Vyper smart contract language for the Ethereum virtual machine where internal calls with default arguments are compiled incorrectly.

  • What is the severity of CVE-2023-32059?

    The severity of CVE-2023-32059 is high with a CVSS score of 7.5.

  • How does CVE-2023-32059 affect Vyper?

    CVE-2023-32059 affects Vyper versions prior to 0.3.8.

  • How can I fix CVE-2023-32059 in Vyper?

    To fix CVE-2023-32059, update Vyper to version 0.3.8 or later.

  • What is the CWE ID for CVE-2023-32059?

    The CWE ID for CVE-2023-32059 is 683.

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