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ExponentCMS <= 2.6 - Host Header Injection

ID: CVE-2021-38751

Severity: medium

Author: dwisiswant0

Tags: cve2021,cve,exponentcms

Description

Section titled “Description”

An HTTP Host header attack exists in ExponentCMS 2.6 and below in /exponent_constants.php. A modified HTTP header can change links on the webpage to an arbitrary value,leading to a possible attack vector for MITM.

YAML Source

Section titled “YAML Source”
id: CVE-2021-38751


info:
  name: ExponentCMS <= 2.6 - Host Header Injection
  author: dwisiswant0
  severity: medium
  description: An HTTP Host header attack exists in ExponentCMS 2.6 and below in /exponent_constants.php. A modified HTTP header can change links on the webpage to an arbitrary value,leading to a possible attack vector for MITM.
  impact: |
    An attacker can manipulate the Host header to perform various attacks, including phishing, session hijacking, and cache poisoning.
  remediation: |
    Upgrade ExponentCMS to a version higher than 2.6 or apply the provided patch to fix the Host Header Injection vulnerability.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2021-38751
    - https://github.com/exponentcms/exponent-cms/issues/1544
    - https://github.com/exponentcms/exponent-cms/blob/a9fa9358c5e8dc2ce7ad61d7d5bea38505b8515c/exponent_constants.php#L56-L64
    - https://github.com/ARPSyndicate/kenzer-templates
    - https://github.com/ARPSyndicate/cvemon
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
    cvss-score: 4.3
    cve-id: CVE-2021-38751
    cwe-id: CWE-116
    epss-score: 0.0012
    epss-percentile: 0.46178
    cpe: cpe:2.3:a:exponentcms:exponentcms:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: exponentcms
    product: exponentcms
  tags: cve2021,cve,exponentcms


http:
  - method: GET
    path:
      - "{{BaseURL}}"


    headers:
      Host: '{{randstr}}.tld'


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '{{randstr}}.tld'
          - 'EXPONENT.PATH'
          - 'EXPONENT.URL'
        condition: and


      - type: status
        status:
          - 200
# digest: 4b0a004830460221008c33aa6a1164bc92cbb8fa8b364ec4164c7cd33cc706cde7e8dab7500861914c022100ef4e54ef447f585ed84b59d80eec2b960d18c53c31be7fa9221b741de9e08531:922c64590222798bb761d5b6d8e72950

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-2021-38751.yaml"

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