unauthorized VNC access in AK-Systems Windows Terminals

2006-08-24 / 2006-08-25
Credit: Victor Sudakov
Risk: Medium
Local: No
Remote: Yes
CVE: CVE-2006-4309
CWE: CWE-Other


CVSS Base Score: 10/10
Impact Subscore: 10/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

WinCE-based Windows Terminals (thin clients) manufactured by AK-Systems (http://www.ak-systems.ru/) with firmware version 1.2.5 ExVLP feature a VNC server for remote administration and setup. The VNC access is not protected by password, so anyone with a VNC client can connect to the terminal and watch the user's RDP/Citrix session, or even meddle into it. Workaround suggested by vendor: older firmware without VNC support should be installed on the terminal. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN sip:sudakov (at) sibptus.tomsk (dot) ru [email concealed]


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