CVE-2024-32645: Vyper Vyper Performs Incorrect Topic Logging Vulnerability

MODERATE
Advisory Identifier: GHSA-xchq-w5r3-4wg3
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CVSS 5.3
CWE-20
Published
Advisory Summary

CVE-2024-32645 is a MODERATE (CVSS 5.3) vyper performs incorrect topic logging vulnerability (CWE-20: Improper Input Validation) affecting Vyper libraries in the PyPI ecosystem. The issue involves vyper performs incorrect topic logging in raw_log. Remediation is available by upgrading affected packages to version 0.4.0.

CVE-2024-32645 at a Glance

CVE Identifier CVE-2024-32645
GHSA Identifier GHSA-xchq-w5r3-4wg3
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-20: Improper Input Validation
Affected Product Vyper
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2024-32645

To remediate this vulnerability, upgrade all affected Vyper dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

vyper fixed: 0.4.0 
pip install vyper>=0.4.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show vyper

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2024-32645, inspect your installed packages using pip:

pip show vyper

Analyze the terminal output to locate any version of Vyper in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.4.0), your application is affected.

Note: The pip show vyper command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Vyper, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Summary Incorrect values can be logged when `raw_log` builtin is called with memory or storage arguments to be used as topics. A contract search was performed and no vulnerable contracts were found in production. In particular, no uses of `raw_log()` were found at all in production; it is apparently not a well-known function. ### Details The `build_IR` function of the `RawLog` class fails to properly unwrap the variables provided as topics. Consequently, incorrect values are logged as topics. ### PoC ```vyper x: bytes32 @external def f(): self.x = 0x1234567890123456789012345678901234567890123456789012345678901234 raw_log([self.x], b"") # LOG1(offset:0x60, size:0x00, topic1:0x00) y: bytes32 = 0x1234567890123456789012345678901234567890123456789012345678901234 raw_log([y], b"") # LOG1(offset:0x80, size:0x00, topic1:0x40) ``` ### Patches Fixed in https://github.com/vyperlang/vyper/pull/3977. ### Impact Incorrect values can be logged which may result in unexpected behavior in client-side applications relying on these logs.

CVE-2024-32645 Affected Vyper Versions

1 component(s)
Fixed Versions:
0.4.0
Product / Package Ecosystem Affected Versions Fixed Version
vyper
pypi/vyper
PyPI
< 0.4.0
0.4.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/vyperlang/vyper/security/advisories/GHSA-xchq-w5r3-4wg3
NVD — CVE-2024-32645 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-32645
Vyper Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2024-206.yaml
Vyper Source Repository REPOSITORY
https://github.com/vyperlang/vyper

Frequently Asked Questions

What is CVE-2024-32645?
CVE-2024-32645 is a security vulnerability in Vyper involving vyper performs incorrect topic logging in raw_log under CWE-20: Improper Input Validation.
Which Vyper versions are affected?
Affected versions include releases prior to 0.4.0 across affected packages: vyper.
What version fixes CVE-2024-32645?
Upgrading to 0.4.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is vyper affected?
Yes, vyper is affected in releases prior to 0.4.0. Upgrade your dependency to 0.4.0 or later.
What is the CVSS score of CVE-2024-32645?
CVE-2024-32645 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2024-32645?
CVE-2024-32645 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check PyPI dependencies for CVE-2024-32645?
Run the dependency tree command: 'pip show vyper'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-xchq-w5r3-4wg3",
  "modified" : "2025-01-21T17:54:04Z",
  "published" : "2024-04-25T19:53:10Z",
  "aliases" : [ "CVE-2024-32645" ],
  "summary" : "vyper performs incorrect topic logging in raw_log",
  "details" : "### Summary\nIncorrect values can be logged when `raw_log` builtin is called with memory or storage arguments to be used as topics.\n\nA contract search was performed and no vulnerable contracts were found in production. In particular, no uses of `raw_log()` were found at all in production; it is apparently not a well-known function.\n\n### Details\nThe `build_IR` function of the `RawLog` class fails to properly unwrap the variables provided as topics. Consequently, incorrect values are logged as topics.\n\n### PoC\n```vyper\nx: bytes32\n\n@external\ndef f():\n    self.x = 0x1234567890123456789012345678901234567890123456789012345678901234\n    raw_log([self.x], b\"\") # LOG1(offset:0x60, size:0x00, topic1:0x00)\n\n    y: bytes32 = 0x1234567890123456789012345678901234567890123456789012345678901234\n    raw_log([y], b\"\") # LOG1(offset:0x80, size:0x00, topic1:0x40)\n```\n### Patches\nFixed in https://github.com/vyperlang/vyper/pull/3977.\n\n### Impact\nIncorrect values can be logged which may result in unexpected behavior in client-side applications relying on these logs.\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "vyper"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.4.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/vyperlang/vyper/security/advisories/GHSA-xchq-w5r3-4wg3"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-32645"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2024-206.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/vyperlang/vyper"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-25T19:53:10Z",
    "nvd_published_at" : "2024-04-25T18:15:08Z"
  }
}