CVE-2023-39363: Vyper Vyper Has Incorrectly Allocated Named Vulnerability

CRITICAL
Advisory Identifier: GHSA-5824-cm3x-3c38
Share
CVSS 8.7
CWE-863
Published
Advisory Summary

CVE-2023-39363 is a CRITICAL (CVSS 8.7) vyper has incorrectly allocated named vulnerability (CWE-863: Incorrect Authorization) affecting Vyper libraries in the PyPI ecosystem. The issue involves vyper has incorrectly allocated named re-entrancy locks. Remediation is available by upgrading affected packages to version 0.3.1.

CVE-2023-39363 at a Glance

CVE Identifier CVE-2023-39363
GHSA Identifier GHSA-5824-cm3x-3c38
Severity CRITICAL
CVSS v3.1 Base Score 8.7
CWE Classification CWE-863: Incorrect Authorization
Affected Product Vyper
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 8.7

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

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality None (C:N)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2023-39363

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: 0.3.1 
pip install vyper>=0.3.1
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-2023-39363, 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 0.3.1), 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-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. 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 In versions 0.2.15, 0.2.16 and 0.3.0, named re-entrancy locks are allocated incorrectly. Each function using a named re-entrancy lock gets a unique lock regardless of the key, allowing cross-function re-entrancy in contracts compiled with the susceptible versions. A specific set of conditions is required to result in misbehavior of affected contracts, specifically: - A `.vy` contract compiled with either of the following `vyper` versions: `0.2.15`, `0.2.16`, `0.3.0` - A primary function that utilizes the `@nonreentrant` decorator with a specific `key` and does not strictly follow the check-effects-interaction pattern (i.e. contains an external call to an untrusted party before storage updates) - A secondary function that utilizes the same `key` and would be affected by the improper state caused by the primary function ### Patches https://github.com/vyperlang/vyper/pull/2439, https://github.com/vyperlang/vyper/pull/2514 ### Workarounds Upgrade to 0.3.1 or higher ### References Technical post-mortem report: https://hackmd.io/@vyperlang/HJUgNMhs2

CVE-2023-39363 Affected Vyper Versions

1 component(s)
Fixed Versions:
0.3.1
Product / Package Ecosystem Affected Versions Fixed Version
vyper
pypi/vyper
PyPI
≥ 0.2.15
< 0.3.1
0.3.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/vyperlang/vyper/security/advisories/GHSA-5824-cm3x-3c38
NVD — CVE-2023-39363 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-39363
Vyper Source Repository REPOSITORY
https://github.com/vyperlang/vyper/pull/2439
Vyper Source Repository REPOSITORY
https://github.com/vyperlang/vyper/pull/2514
Vyper Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2023-142.yaml
Vyper Source Repository REPOSITORY
https://github.com/vyperlang/vyper
hackmd.io/@llamarisk/bjzskhnj... WEB
https://hackmd.io/@LlamaRisk/BJzSKHNjn
hackmd.io/@vyperlang/hjugnmhs... WEB
https://hackmd.io/@vyperlang/HJUgNMhs2

Frequently Asked Questions

What is CVE-2023-39363?
CVE-2023-39363 is a security vulnerability in Vyper involving Vyper has incorrectly allocated named re-entrancy locks under CWE-863: Incorrect Authorization.
Which Vyper versions are affected?
Affected versions include releases prior to 0.3.1 across affected packages: vyper.
What version fixes CVE-2023-39363?
Upgrading to 0.3.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is vyper affected?
Yes, vyper is affected in releases prior to 0.3.1. Upgrade your dependency to 0.3.1 or later.
What is the CVSS score of CVE-2023-39363?
CVE-2023-39363 has a CVSS v3.1 base score of 8.7 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:H.
What CWE is associated with CVE-2023-39363?
CVE-2023-39363 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).
How can I check PyPI dependencies for CVE-2023-39363?
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-5824-cm3x-3c38",
  "modified" : "2024-10-11T14:04:46Z",
  "published" : "2023-08-09T14:27:57Z",
  "aliases" : [ "CVE-2023-39363" ],
  "summary" : "Vyper has incorrectly allocated named re-entrancy locks",
  "details" : "### Impact\n\nIn versions 0.2.15, 0.2.16 and 0.3.0, named re-entrancy locks are allocated incorrectly. Each function using a named re-entrancy lock gets a unique lock regardless of the key, allowing cross-function re-entrancy in contracts compiled with the susceptible versions. A specific set of conditions is required to result in misbehavior of affected contracts, specifically:\n\n- A `.vy` contract compiled with either of the following `vyper` versions: `0.2.15`, `0.2.16`, `0.3.0`\n- A primary function that utilizes the `@nonreentrant` decorator with a specific `key` and does not strictly follow the check-effects-interaction pattern (i.e. contains an external call to an untrusted party before storage updates)\n- A secondary function that utilizes the same `key` and would be affected by the improper state caused by the primary function\n\n### Patches\nhttps://github.com/vyperlang/vyper/pull/2439, https://github.com/vyperlang/vyper/pull/2514\n\n### Workarounds\nUpgrade to 0.3.1 or higher\n\n### References\nTechnical post-mortem report: https://hackmd.io/@vyperlang/HJUgNMhs2",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H/E:A"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "vyper"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.2.15"
      }, {
        "fixed" : "0.3.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/vyperlang/vyper/security/advisories/GHSA-5824-cm3x-3c38"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-39363"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vyperlang/vyper/pull/2439"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vyperlang/vyper/pull/2514"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2023-142.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/vyperlang/vyper"
  }, {
    "type" : "WEB",
    "url" : "https://hackmd.io/@LlamaRisk/BJzSKHNjn"
  }, {
    "type" : "WEB",
    "url" : "https://hackmd.io/@vyperlang/HJUgNMhs2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-08-09T14:27:57Z",
    "nvd_published_at" : "2023-08-07T19:15:11Z"
  }
}