Hewlett Packard TouchSmart Calendar Service 4.1.4245 Privilege Escalation

`[+] Credits: John Page aka hyp3rlinx  
  
[+] Website: hyp3rlinx.altervista.org  
  
[+] Source:  
http://hyp3rlinx.altervista.org/advisories/HP-TOUCHSMART-CALENDAR-PRIVILEGE-ESCALATION.txt  
  
[+] ISR: ApparitionSec  
  
  
  
Vendor:  
==========  
www.hp.com  
  
  
  
Product:  
===========================================  
Hewlett Packard TouchSmart Calendar Service  
File version : 4.1.4245  
  
HP TouchSmart Calendar is a shared calendar where you can manage your  
familyas schedule. You can also view scheduled events for today  
and tomorrow, e-mail calendar events with Google mail, and print your  
schedule.  
  
  
  
Vulnerability Type:  
=====================  
Privilege Escalation  
  
  
  
CVE Reference:  
==============  
N/A  
  
  
  
Vulnerability Details:  
=====================  
  
HP Calendar Service uses weak insecure permissions settings on its  
files/directory as the aEveryonea group has full access on it.  
Allowing low privileged users to execute arbitrary code in the security  
context of ANY other users with elevated privileges  
on the affected system.  
  
Any user (even guest) will be able to replace, modify or change the file.  
This would allow an attacker the ability to inject code  
or replace the "HPTouchSmartSyncCalReminderApp.exe" executable and have it  
run in the context of the system.  
  
  
Proof...  
  
c:\Windows\System32>sc query "HP Support Assistant Service"  
  
SERVICE_NAME: HP Support Assistant Service  
TYPE : 10 WIN32_OWN_PROCESS  
STATE : 4 RUNNING  
(STOPPABLE, NOT_PAUSABLE, ACCEPTS_SHUTDOWN)  
WIN32_EXIT_CODE : 0 (0x0)  
SERVICE_EXIT_CODE : 0 (0x0)  
CHECKPOINT : 0x0  
WAIT_HINT : 0x0  
  
  
c:\>cacls "C:\Program Files  
(x86)\Hewlett-Packard\TouchSmart\Calendar\Service"  
C:\Program Files (x86)\Hewlett-Packard\TouchSmart\Calendar\Service  
Everyone:(OI)(CI)F  
NT  
AUTHORITY\SYSTEM:(OI)(CI)F  
  
  
  
Disclosure Timeline:  
======================================  
Vendor Notification: October 14, 2016  
Vendor response: Product past warranty support  
October 26, 2016 : Public Disclosure  
  
  
Exploitation Technique:  
=======================  
Local  
  
  
  
Severity Level:  
================  
Medium  
  
  
  
  
[+] Disclaimer  
The information contained within this advisory is supplied "as-is" with no  
warranties or guarantees of fitness of use or otherwise.  
Permission is hereby granted for the redistribution of this advisory,  
provided that it is not altered except by reformatting it, and  
that due credit is given. Permission is explicitly given for insertion in  
vulnerability databases and similar, provided that due credit  
is given to the author. The author is not responsible for any misuse of the  
information contained herein and accepts no responsibility  
for any damage caused by the use or misuse of this information. The author  
prohibits any malicious use of security related information  
or exploits by the author or elsewhere.  
  
hyp3rlinx  
`