GHSA-7vrm-3jc8-5wwm: Vyper Incorrect Comparison Vulnerability

HIGH
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CVSS 7.5
CWE-697
Published
Advisory Summary

GHSA-7vrm-3jc8-5wwm is a HIGH (CVSS 7.5) incorrect comparison vulnerability (CWE-697: Incorrect Comparison) affecting Vyper libraries in the PyPI ecosystem. The issue involves incorrect comparison in vyper. Remediation is available by upgrading affected packages to version 0.3.2.

GHSA-7vrm-3jc8-5wwm at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-7vrm-3jc8-5wwm
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-697: Incorrect Comparison
Affected Product Vyper
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:H/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 High (I:H)
Availability None (A:N)

How to Fix GHSA-7vrm-3jc8-5wwm

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: 0.3.2 
pip install vyper>=0.3.2
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 GHSA-7vrm-3jc8-5wwm, 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 0.3.2), 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-697: Incorrect Comparison, where the product compares two entities in a security-relevant context, but the comparison is incorrect. 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

### Impact bytestrings can have dirty bytes in them, resulting in the word-for-word comparison to give incorrect results, e.g. ```vyper b1: Bytes[32] = b"abcdef" b1 = slice(b1, 0, 1) b2: Bytes[32] = b"abcdef" t: bool = b1 == b2 # incorrectly evaluates to True ``` even without dirty nonzero bytes, because there is no comparison of the length, two bytestrings can compare to equal if one ends with `"\x00"`. ```vyper b1: Bytes[32] = b"abc\0" b2: Bytes[32] = b"abc" t: bool = b1 == b2 # incorrectly evaluates to True ``` ### Patches fixed in https://github.com/vyperlang/vyper/commit/2c73f8352635c0a433423a5b94740de1a118e508

GHSA-7vrm-3jc8-5wwm Affected Vyper Versions

1 component(s)
Fixed Versions:
0.3.2
Product / Package Ecosystem Affected Versions Fixed Version
vyper
pypi/vyper
PyPI
< 0.3.2
0.3.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/vyperlang/vyper/security/advisories/GHSA-7vrm-3jc8-5wwm
Security Fix Commit FIX COMMIT
https://github.com/vyperlang/vyper/commit/2c73f8352635c0a433423a5b94740de1a118e508
Vyper Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2022-196.yaml
Vyper Source Repository REPOSITORY
https://github.com/vyperlang/vyper

Frequently Asked Questions

What is GHSA-7vrm-3jc8-5wwm?
GHSA-7vrm-3jc8-5wwm is a security vulnerability in Vyper involving Incorrect Comparison in Vyper under CWE-697: Incorrect Comparison.
Which Vyper versions are affected?
Affected versions include releases prior to 0.3.2 across affected packages: vyper.
What version fixes GHSA-7vrm-3jc8-5wwm?
Upgrading to 0.3.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is vyper affected?
Yes, vyper is affected in releases prior to 0.3.2. Upgrade your dependency to 0.3.2 or later.
What is the CVSS score of GHSA-7vrm-3jc8-5wwm?
GHSA-7vrm-3jc8-5wwm has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with GHSA-7vrm-3jc8-5wwm?
GHSA-7vrm-3jc8-5wwm is classified under CWE-697: Incorrect Comparison (The product compares two entities in a security-relevant context, but the comparison is incorrect.).
How can I check PyPI dependencies for GHSA-7vrm-3jc8-5wwm?
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-7vrm-3jc8-5wwm",
  "modified" : "2022-04-06T17:39:02Z",
  "published" : "2022-04-04T21:40:45Z",
  "aliases" : [ ],
  "summary" : "Incorrect Comparison in Vyper",
  "details" : "### Impact\nbytestrings can have dirty bytes in them, resulting in the word-for-word comparison to give incorrect results, e.g.\n```vyper\nb1: Bytes[32] = b\"abcdef\"\nb1 = slice(b1, 0, 1)\nb2: Bytes[32] = b\"abcdef\"\nt: bool = b1 == b2  # incorrectly evaluates to True\n```\neven without dirty nonzero bytes, because there is no comparison of the length, two bytestrings can compare to equal if one ends with `\"\\x00\"`.\n```vyper\nb1: Bytes[32] = b\"abc\\0\"\nb2: Bytes[32] = b\"abc\"\nt: bool = b1 == b2  # incorrectly evaluates to True\n```\n\n### Patches\nfixed in https://github.com/vyperlang/vyper/commit/2c73f8352635c0a433423a5b94740de1a118e508",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "vyper"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.3.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/vyperlang/vyper/security/advisories/GHSA-7vrm-3jc8-5wwm"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vyperlang/vyper/commit/2c73f8352635c0a433423a5b94740de1a118e508"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2022-196.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/vyperlang/vyper"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-697" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-04-04T21:40:45Z",
    "nvd_published_at" : null
  }
}