CVE-2021-4119: Ssddanbrown/bookstack BookStack Is Vulnerable To Improper Vulnerability

MODERATE
Advisory Identifier: GHSA-9c5c-5j4h-8q2c
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CVSS 5.3
CWE-284
Published
Advisory Summary

CVE-2021-4119 is a MODERATE (CVSS 5.3) bookstack is vulnerable to improper vulnerability (CWE-284: Improper Access Control) 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 21.11.3.

CVE-2021-4119 at a Glance

CVE Identifier CVE-2021-4119
GHSA Identifier GHSA-9c5c-5j4h-8q2c
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-284: Improper Access Control
Affected Product Ssddanbrown/bookstack
Package Ecosystem Packagist
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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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 Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2021-4119

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: 21.11.3 
Upgrade ssddanbrown/bookstack to 21.11.3
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-2021-4119, 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 21.11.3), 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-284: Improper Access Control, where the product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. 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 prior to version 21.11.3 is vulnerable to Improper Access Control. A logged-in user with no privileges OR guest user (if public access enabled) can access the /search/users/select AJAX endpoint meant for admins to manage audit logs, to dump all usernames existing in the Bookstack database. This can also be used to harvest email belonging to a user because BookStack also uses the code where(`email`, `like`, `%` . $search . `%`) to search for users based on email.

CVE-2021-4119 Affected Ssddanbrown/bookstack Versions

1 component(s)
Fixed Versions:
21.11.3
Product / Package Ecosystem Affected Versions Fixed Version
ssddanbrown/bookstack
 Packagist
< 21.11.3
21.11.3

References

NVD — CVE-2021-4119 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-4119
Security Fix Commit FIX COMMIT
https://github.com/bookstackapp/bookstack/commit/e765e618547c92f4e0b46caca6fb91f0174efd99
Ssddanbrown/bookstack Release RELEASE
https://github.com/BookStackApp/BookStack/releases/tag/v21.11.3
Ssddanbrown/bookstack Source Repository REPOSITORY
https://github.com/bookstackapp/bookstack
huntr.dev/bounties/135f2d7d-a... WEB
https://huntr.dev/bounties/135f2d7d-ab0b-4351-99b9-889efac46fca

Frequently Asked Questions

What is CVE-2021-4119?
CVE-2021-4119 is a security vulnerability in Ssddanbrown/bookstack involving BookStack is vulnerable to Improper Access Control. under CWE-284: Improper Access Control.
Which Ssddanbrown/bookstack versions are affected?
Affected versions include releases prior to 21.11.3 across affected packages: ssddanbrown/bookstack.
What version fixes CVE-2021-4119?
Upgrading to 21.11.3 (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 21.11.3. Upgrade your dependency to 21.11.3 or later.
What is the CVSS score of CVE-2021-4119?
CVE-2021-4119 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2021-4119?
CVE-2021-4119 is classified under CWE-284: Improper Access Control (The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.).
How can I check Packagist dependencies for CVE-2021-4119?
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-9c5c-5j4h-8q2c",
  "modified" : "2022-08-11T18:45:55Z",
  "published" : "2021-12-16T19:40:26Z",
  "aliases" : [ "CVE-2021-4119" ],
  "summary" : "BookStack is vulnerable to Improper Access Control.",
  "details" : "BookStack prior to version 21.11.3 is vulnerable to Improper Access Control. A logged-in user with no privileges OR guest user (if public access enabled) can access the /search/users/select AJAX endpoint meant for admins to manage audit logs, to dump all usernames existing in the Bookstack database. This can also be used to harvest email belonging to a user because BookStack also uses the code where(`email`, `like`, `%` . $search . `%`) to search for users based on email.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "ssddanbrown/bookstack"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "21.11.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-4119"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/bookstackapp/bookstack/commit/e765e618547c92f4e0b46caca6fb91f0174efd99"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/BookStackApp/BookStack/releases/tag/v21.11.3"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/bookstackapp/bookstack"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.dev/bounties/135f2d7d-ab0b-4351-99b9-889efac46fca"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-12-16T15:36:38Z",
    "nvd_published_at" : "2021-12-15T20:15:00Z"
  }
}