CVE-2021-4194: Ssddanbrown/bookstack Bookstack Is Vulnerable To Improper Vulnerability

MODERATE
Advisory Identifier: GHSA-ghhm-xrwp-75m9
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CVSS 4.3
CWE-668 CWE-284 CWE-863
Published
Advisory Summary

CVE-2021-4194 is a MODERATE (CVSS 4.3) bookstack is vulnerable to improper vulnerability (CWE-668: Exposure of Resource to Wrong Sphere) affecting Ssddanbrown/bookstack libraries in the Packagist ecosystem. The issue involves bookstack is vulnerable to improper access control. Remediation is available by upgrading affected packages to version 21.12.1.

CVE-2021-4194 at a Glance

CVE Identifier CVE-2021-4194
GHSA Identifier GHSA-ghhm-xrwp-75m9
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-668: Exposure of Resource to Wrong Sphere
Affected Product Ssddanbrown/bookstack
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 4.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2021-4194

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

ssddanbrown/bookstack fixed: 21.12.1 
Upgrade ssddanbrown/bookstack to 21.12.1
Verify Direct and Transitive Dependencies

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

inspect dependencies for ssddanbrown/bookstack

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-4194, inspect your project dependencies for Ssddanbrown/bookstack:

inspect dependencies for ssddanbrown/bookstack

Analyze the terminal output to locate any version of Ssddanbrown/bookstack in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 21.12.1), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-668: Exposure of Resource to Wrong Sphere, where the product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource. In Ssddanbrown/bookstack, 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

bookstack is vulnerable to Improper Access Control

CVE-2021-4194 Affected Ssddanbrown/bookstack Versions

1 component(s)
Fixed Versions:
21.12.1
Product / Package Ecosystem Affected Versions Fixed Version
ssddanbrown/bookstack
 Packagist
< 21.12.1
21.12.1

References

NVD — CVE-2021-4194 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-4194
Security Fix Commit FIX COMMIT
https://github.com/bookstackapp/bookstack/commit/cb0d674a71449de883713db2fcdccb6e108992ad
Ssddanbrown/bookstack Source Repository REPOSITORY
https://github.com/bookstackapp/bookstack
huntr.dev/bounties/0bc8b3f7-9... WEB
https://huntr.dev/bounties/0bc8b3f7-9057-4eb7-a989-24cd5689f114

Frequently Asked Questions

What is CVE-2021-4194?
CVE-2021-4194 is a security vulnerability in Ssddanbrown/bookstack involving bookstack is vulnerable to Improper Access Control under CWE-668: Exposure of Resource to Wrong Sphere.
Which Ssddanbrown/bookstack versions are affected?
Affected versions include releases prior to 21.12.1 across affected packages: ssddanbrown/bookstack.
What version fixes CVE-2021-4194?
Upgrading to 21.12.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is ssddanbrown/bookstack affected?
Yes, ssddanbrown/bookstack is affected in releases prior to 21.12.1. Upgrade your dependency to 21.12.1 or later.
What is the CVSS score of CVE-2021-4194?
CVE-2021-4194 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2021-4194?
CVE-2021-4194 is classified under CWE-668: Exposure of Resource to Wrong Sphere (The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource.).
How can I check Packagist dependencies for CVE-2021-4194?
Run the dependency tree command: 'inspect dependencies for ssddanbrown/bookstack'. 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-ghhm-xrwp-75m9",
  "modified" : "2022-01-07T22:38:34Z",
  "published" : "2022-01-08T00:34:12Z",
  "aliases" : [ "CVE-2021-4194" ],
  "summary" : "bookstack is vulnerable to Improper Access Control",
  "details" : "bookstack is vulnerable to Improper Access Control",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "ssddanbrown/bookstack"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "21.12.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-4194"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/bookstackapp/bookstack/commit/cb0d674a71449de883713db2fcdccb6e108992ad"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/bookstackapp/bookstack"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.dev/bounties/0bc8b3f7-9057-4eb7-a989-24cd5689f114"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284", "CWE-668", "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-01-07T22:38:34Z",
    "nvd_published_at" : "2022-01-06T18:15:00Z"
  }
}