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"HP System Event Utility - Local Privilege Escalation"

Author

Exploit author

hyp3rlinx

Platform

Exploit platform

windows

Release date

Exploit published date

2020-02-12

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# Exploit Title: HP System Event Utility - Local Privilege Escalation
# Author: hyp3rlinx
# Date: 2020-02-11
# Vendor: www.hp.com
# Link: https://hp-system-event-utility.en.lo4d.com/download
# CVE: CVE-2019-18915



[+] Credits: John Page (aka hyp3rlinx)		
[+] Website: hyp3rlinx.altervista.org
[+] Source:  http://hyp3rlinx.altervista.org/advisories/HP-SYSTEM-EVENT-UTILITY-LOCAL-PRIVILEGE-ESCALATION.txt
[+] twitter.com/hyp3rlinx
[+] ISR: ApparitionSec


[Vendor]
www.hp.com


[Product]
HP System Event Utility


The genuine HPMSGSVC.exe file is a software component of HP System Event Utility by HP Inc.
HP System Event Utility enables the functioning of special function keys on select HP devices.


[Vulnerability Type]
Local Privilege Escalation



[CVE Reference]
CVE-2019-18915



[Security Issue]
The HP System Event service "HPMSGSVC.exe" will load an arbitrary EXE and execute it with SYSTEM integrity.
HPMSGSVC.exe runs a background process that delivers push notifications.

The problem is that HP Message Service will load and execute any arbitrary executable named "Program.exe"
if found in the users c:\ drive.

Path: C:\Program Files (x86)\HP\HP System Event\SmrtAdptr.exe

Two Handles are inherit, properties are Write/Read
Name: \Device\ConDrv

This results in arbitrary code execution persistence mechanism if an attacker can place an EXE in this location
and can be used to escalate privileges from Admin to SYSTEM.

HP has/is released/releasing a mitigation: https://support.hp.com/us-en/document/c06559359


[References]
PSR-2019-0204
https://support.hp.com/us-en/document/c06559359



[Network Access]
Local


[Disclosure Timeline]
Vendor Notification:  October 7, 2019
HP PSRT "product team will address the issue in next release" : January 13, 2020
HP advisory and mitigation release : February 10, 2020
February 11, 2020 : Public Disclosure



[+] 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. All content (c).

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