CVE-2018-18921: Phpservermon/phpservermon CSRF Vulnerability

MODERATE
Advisory Identifier: GHSA-w2g4-g8xr-px4x
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CVSS 6.5
CWE-352
Published
Advisory Summary

CVE-2018-18921 is a MODERATE (CVSS 6.5) csrf vulnerability (CWE-352: Cross-Site Request Forgery (CSRF)) affecting Phpservermon/phpservermon libraries in the Packagist ecosystem. The issue involves csrf in php server monitor before 3.3.2. Remediation is available by upgrading affected packages to version 3.3.2.

CVE-2018-18921 at a Glance

CVE Identifier CVE-2018-18921
GHSA Identifier GHSA-w2g4-g8xr-px4x
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-352: Cross-Site Request Forgery (CSRF)
Affected Product Phpservermon/phpservermon
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.5

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:R/S:U/C:N/I:H/A:N).

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

How to Fix CVE-2018-18921

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

phpservermon/phpservermon fixed: 3.3.2 
Upgrade phpservermon/phpservermon to 3.3.2
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 phpservermon/phpservermon

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-18921, inspect your project dependencies for Phpservermon/phpservermon:

inspect dependencies for phpservermon/phpservermon

Analyze the terminal output to locate any version of Phpservermon/phpservermon in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.3.2), 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-352: Cross-Site Request Forgery (CSRF), where the web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor. In Phpservermon/phpservermon, 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

PHP Server Monitor before 3.3.2 has CSRF, as demonstrated by a Delete action.

CVE-2018-18921 Affected Phpservermon/phpservermon Versions

1 component(s)
Fixed Versions:
3.3.2
Product / Package Ecosystem Affected Versions Fixed Version
phpservermon/phpservermon
 Packagist
< 3.3.2
3.3.2

References

NVD — CVE-2018-18921 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-18921
Phpservermon/phpservermon Source Repository REPOSITORY
https://github.com/phpservermon/phpservermon/issues/670#issuecomment-440873239
Security Fix Commit FIX COMMIT
https://github.com/phpservermon/phpservermon/commit/30150714a8af0c82259b733f604fce54c0dcbf40
medium.com/bugbountywriteup/cv... WEB
https://medium.com/bugbountywriteup/cve-2018-18921-php-server-monitor-3-3-1-cross-site-request-forgery-a73e8dae563

Frequently Asked Questions

What is CVE-2018-18921?
CVE-2018-18921 is a security vulnerability in Phpservermon/phpservermon involving CSRF in PHP Server Monitor before 3.3.2 under CWE-352: Cross-Site Request Forgery (CSRF).
Which Phpservermon/phpservermon versions are affected?
Affected versions include releases prior to 3.3.2 across affected packages: phpservermon/phpservermon.
What version fixes CVE-2018-18921?
Upgrading to 3.3.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is phpservermon/phpservermon affected?
Yes, phpservermon/phpservermon is affected in releases prior to 3.3.2. Upgrade your dependency to 3.3.2 or later.
What is the CVSS score of CVE-2018-18921?
CVE-2018-18921 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2018-18921?
CVE-2018-18921 is classified under CWE-352: Cross-Site Request Forgery (CSRF) (The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.).
How can I check Packagist dependencies for CVE-2018-18921?
Run the dependency tree command: 'inspect dependencies for phpservermon/phpservermon'. 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-w2g4-g8xr-px4x",
  "modified" : "2023-07-07T17:26:31Z",
  "published" : "2022-05-14T01:42:49Z",
  "aliases" : [ "CVE-2018-18921" ],
  "summary" : "CSRF in PHP Server Monitor before 3.3.2",
  "details" : "PHP Server Monitor before 3.3.2 has CSRF, as demonstrated by a Delete action.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "phpservermon/phpservermon"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.3.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.3.1"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-18921"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/phpservermon/phpservermon/issues/670#issuecomment-440873239"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/phpservermon/phpservermon/commit/30150714a8af0c82259b733f604fce54c0dcbf40"
  }, {
    "type" : "WEB",
    "url" : "https://medium.com/bugbountywriteup/cve-2018-18921-php-server-monitor-3-3-1-cross-site-request-forgery-a73e8dae563"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-352" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-07T17:26:31Z",
    "nvd_published_at" : "2018-12-18T22:29:00Z"
  }
}