CVE-2019-9826: Phpbb/phpbb Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-6pgr-x867-h7jx
Share
CVSS 7.5
CWE-20
Published
Advisory Summary

CVE-2019-9826 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-20: Improper Input Validation) affecting Phpbb/phpbb libraries in the Packagist ecosystem. The issue involves phpbb denial of service. Remediation is available by upgrading affected packages to version 3.2.6.

CVE-2019-9826 at a Glance

CVE Identifier CVE-2019-9826
GHSA Identifier GHSA-6pgr-x867-h7jx
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-20: Improper Input Validation
Affected Product Phpbb/phpbb
Package Ecosystem Packagist
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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

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

How to Fix CVE-2019-9826

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

phpbb/phpbb fixed: 3.2.6 
Upgrade phpbb/phpbb to 3.2.6
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 phpbb/phpbb

How to Check if You Are Affected

To determine whether your application is affected by CVE-2019-9826, inspect your project dependencies for Phpbb/phpbb:

inspect dependencies for phpbb/phpbb

Analyze the terminal output to locate any version of Phpbb/phpbb in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.2.6), 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-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Phpbb/phpbb, 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

The fulltext search component in phpBB before 3.2.6 allows Denial of Service.

CVE-2019-9826 Affected Phpbb/phpbb Versions

1 component(s)
Fixed Versions:
3.2.6
Product / Package Ecosystem Affected Versions Fixed Version
phpbb/phpbb
 Packagist
< 3.2.6
3.2.6

References

NVD — CVE-2019-9826 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-9826
Phpbb/phpbb Source Repository REPOSITORY
https://github.com/phpbb/phpbb-app
www.phpbb.com/community/viewtopic... WEB
https://www.phpbb.com/community/viewtopic.php?f=14&t=2509941
Phpbb/phpbb Security Information SECURITY
http://www.openwall.com/lists/oss-security/2019/04/29/3

Frequently Asked Questions

What is CVE-2019-9826?
CVE-2019-9826 is a security vulnerability in Phpbb/phpbb involving phpBB Denial of Service under CWE-20: Improper Input Validation.
Which Phpbb/phpbb versions are affected?
Affected versions include releases prior to 3.2.6 across affected packages: phpbb/phpbb.
What version fixes CVE-2019-9826?
Upgrading to 3.2.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is phpbb/phpbb affected?
Yes, phpbb/phpbb is affected in releases prior to 3.2.6. Upgrade your dependency to 3.2.6 or later.
What is the CVSS score of CVE-2019-9826?
CVE-2019-9826 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2019-9826?
CVE-2019-9826 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check Packagist dependencies for CVE-2019-9826?
Run the dependency tree command: 'inspect dependencies for phpbb/phpbb'. 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-6pgr-x867-h7jx",
  "modified" : "2024-04-24T17:50:31Z",
  "published" : "2022-05-24T16:45:05Z",
  "aliases" : [ "CVE-2019-9826" ],
  "summary" : "phpBB Denial of Service",
  "details" : "The fulltext search component in phpBB before 3.2.6 allows Denial of Service.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "phpbb/phpbb"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.2.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-9826"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/phpbb/phpbb-app"
  }, {
    "type" : "WEB",
    "url" : "https://www.phpbb.com/community/viewtopic.php?f=14&t=2509941"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2019/04/29/3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-24T17:50:31Z",
    "nvd_published_at" : "2019-05-02T21:29:00Z"
  }
}