Vulnerabilities in pkg:pypi/bikeshed

PACKAGE
Advisory Identifier: GHSA-hf6p-4rv2-9qrp
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Advisory Summary

CVE-2021-23423 is a MODERATE (CVSS 5.5) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Bikeshed libraries in the PyPI ecosystem. The issue involves path traversal in bikshed. Remediation is available by upgrading affected packages to version 3.0.0.

2 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:pypi/bikeshed

2 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:pypi/bikeshed. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-hf6p-4rv2-9qrp CVE-2021-23423 MODERATE Path Traversal in bikshed
GHSA-87cj-px37-rc3x CVE-2021-23422 HIGH OS Command Injection in bikeshed

CVE-2021-23423 at a Glance

CVE Identifier CVE-2021-23423
GHSA Identifier GHSA-hf6p-4rv2-9qrp
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Bikeshed
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 5.5

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

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

How to Fix CVE-2021-23423

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

bikeshed fixed: 3.0.0 
pip install bikeshed>=3.0.0
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 bikeshed

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2021-23423, inspect your installed packages using pip:

pip show bikeshed

Analyze the terminal output to locate any version of Bikeshed in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.0.0), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Bikeshed, 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

This affects the package bikeshed before 3.0.0. This can occur when an untrusted source file containing include, include-code or include-raw block is processed. The contents of arbitrary files could be disclosed in the HTML output.

CVE-2021-23423 Affected Bikeshed Versions

1 component(s)
Fixed Versions:
3.0.0
Product / Package Ecosystem Affected Versions Fixed Version
bikeshed
pypi/bikeshed
PyPI
< 3.0.0
3.0.0

References

NVD — CVE-2021-23423 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-23423
Security Fix Commit FIX COMMIT
https://github.com/tabatkins/bikeshed/commit/b2f668fca204260b1cad28d5078e93471cb6b2dd
Bikeshed Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/bikeshed/PYSEC-2021-117.yaml
Bikeshed Source Repository REPOSITORY
https://github.com/tabatkins/bikeshed
snyk.io/vuln/snyk-python-bi... WEB
https://snyk.io/vuln/SNYK-PYTHON-BIKESHED-1537647

Frequently Asked Questions

What is CVE-2021-23423?
CVE-2021-23423 is a security vulnerability in Bikeshed involving Path Traversal in bikshed under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Bikeshed versions are affected?
Affected versions include releases prior to 3.0.0 across affected packages: bikeshed.
What version fixes CVE-2021-23423?
Upgrading to 3.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is bikeshed affected?
Yes, bikeshed is affected in releases prior to 3.0.0. Upgrade your dependency to 3.0.0 or later.
What is the CVSS score of CVE-2021-23423?
CVE-2021-23423 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2021-23423?
CVE-2021-23423 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).
How can I check PyPI dependencies for CVE-2021-23423?
Run the dependency tree command: 'pip show bikeshed'. 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-hf6p-4rv2-9qrp",
  "modified" : "2024-09-04T21:13:33Z",
  "published" : "2021-08-30T16:25:42Z",
  "aliases" : [ "CVE-2021-23423" ],
  "summary" : "Path Traversal in bikshed",
  "details" : "This affects the package bikeshed before 3.0.0. This can occur when an untrusted source file containing include, include-code or include-raw block is processed. The contents of arbitrary files could be disclosed in the HTML output.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "bikeshed"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-23423"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/tabatkins/bikeshed/commit/b2f668fca204260b1cad28d5078e93471cb6b2dd"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/bikeshed/PYSEC-2021-117.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/tabatkins/bikeshed"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-PYTHON-BIKESHED-1537647"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-26T15:45:24Z",
    "nvd_published_at" : "2021-08-16T08:15:00Z"
  }
}