Icecream 4.53 / Pro Privilege Escalation

`Document Title:  
===============  
Icecream v4.53 & Pro - File Permission Privilege Escalation  
  
  
References (Source):  
====================  
https://www.vulnerability-lab.com/get_content.php?id=2058  
  
  
Release Date:  
=============  
2017-04-27  
  
  
Vulnerability Laboratory ID (VL-ID):  
====================================  
2058  
  
  
Common Vulnerability Scoring System:  
====================================  
4.1  
  
  
Vulnerability Class:  
====================  
Privilege Escalation  
  
  
Product & Service Introduction:  
===============================  
Meet Icecream Ebook Reader, one of the best EPUB readers that transforms your computer screen into a convenient top-notch ebook reader.   
The tool enables you to read ebooks in EPUB, MOBI, FB2, PDF and other popular formats. Manage your digital library on your PC,   
Windows-based laptop or PC tablet. This program also features the ability to turn pages, use bookmarks, add notes, translate text,   
search your library, track reading progress and much more.  
  
(Copy of the Vendor Homepage: https://icecreamapps.com/Ebook-Reader/ )  
  
  
Abstract Advisory Information:  
==============================  
The vulnerability laboratory core research team discovered an insecure file permission privilege escalation vulnerability in the official Icecream Ebook Reader v4.53 software.  
  
  
Vulnerability Disclosure Timeline:  
==================================  
2016-04-27: Public Disclosure (Vulnerability Laboratory)  
  
  
Discovery Status:  
=================  
Published  
  
  
Affected Product(s):  
====================  
Icecream Apps Ltd  
Product: Icecream - Software (Windows) 4.53 & Pro  
  
  
Exploitation Technique:  
=======================  
Local  
  
  
Severity Level:  
===============  
Medium  
  
  
Technical Details & Description:  
================================  
An insecure file permissions vulnerability has been discovered in the official Icecream Ebook Reader v4.53 software.  
The vulnerability allows local attackers with system user accounts to elevate the access to higher system privileges.  
  
The issue exists because of an insecure default permissions set in the "unins000.exe" or "ebookreader.exe" files.   
Local attackers are able to elevate the access permission of the software process by successful exploitation.   
Local attackers could exploit the vulnerability by a replace of the "unins000.exe" or "ebookreader.exe" files   
with a malicious executable file. The malicious file is exectuable with the local system user permissions.  
  
The security risk of the issue is estimated as medium with a cvss (common vulnerability scoring system) count of 4.1.   
Exploitation of the software vulnerability requires a low privilege system user account with restricted access and   
without user interaction. Successful exploitation of the vulnerability results in system process compromise and   
further manipulation or exploitation to compromise the local computer operating system.  
  
  
  
Proof of Concept (PoC):  
=======================  
The local privilege escalation vulnerability can be exploited by local attackers without user interaction and with system user account.  
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.  
  
  
--- Session Logs (Privileges) ---  
C:Program FilesIcecream Ebook Reader  
Medium Mandatory Level (Default) [No-Write-Up]  
RW Everyone  
FILE_ADD_FILE  
FILE_ADD_SUBDIRECTORY  
FILE_LIST_DIRECTORY  
FILE_READ_ATTRIBUTES  
FILE_READ_EA  
FILE_TRAVERSE  
FILE_WRITE_ATTRIBUTES  
FILE_WRITE_EA  
DELETE  
SYNCHRONIZE  
READ_CONTROL  
RW NT SERVICETrustedInstaller  
FILE_ALL_ACCESS  
RW NT AUTHORITYSYSTEM  
FILE_ALL_ACCESS  
RW BUILTINAdministrators  
FILE_ALL_ACCESS  
R BUILTINUsers  
FILE_LIST_DIRECTORY  
FILE_READ_ATTRIBUTES  
FILE_READ_EA  
FILE_TRAVERSE  
SYNCHRONIZE  
READ_CONTROL  
  
C:Program FilesIcecream Ebook Reader Everyone:(OI)(CI)(M)   
NT SERVICETrustedInstaller:(I)(F)  
NT SERVICETrustedInstaller:(I)(CI)(IO)(F)  
NT AUTHORITYSYSTEM:(I)(F)  
NT AUTHORITYSYSTEM:(I)(OI)(CI)(IO)(F)  
BUILTINAdministrators:(I)(F)  
BUILTINAdministrators:(I)(OI)(CI)(IO)(F)  
BUILTINUsers:(I)(RX)  
BUILTINUsers:(I)(OI)(CI)(IO)(GR,GE)  
CREATOR OWNER:(I)(OI)(CI)(IO)(F)  
  
ebookreader.exe Everyone:(I)(M)   
NT AUTHORITYSYSTEM:(I)(F)  
BUILTINAdministrators:(I)(F)  
BUILTINUsers:(I)(RX)  
  
C:Program FilesIcecream Ebook ReaderEbookreader.exe Everyone:(ID)C   
NT AUTHORITYSYSTEM:(ID)F  
BUILTINAdministrators:(ID)F  
BUILTINUsers:(ID)R  
  
C:Program FilesIcecream Ebook ReaderUnins000.exe Everyone:(ID)C   
NT AUTHORITYSYSTEM:(ID)F  
BUILTINAdministrators:(ID)F  
BUILTINUsers:(ID)R  
  
  
Security Risk:  
==============  
The security risk of the local insecure file permission privilege escalation vulnerability in the icecream ebook reader v4.53 software is estimated as medium. (CVSS 4.1)  
  
  
  
Credits & Authors:  
==================  
Vulnerability Laboratory [Core Research Team] - SaifAllah benMassaoud (http://www.vulnerability-lab.com/show.php?user=SaifAllahbenMassaoud)  
  
  
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=========================  
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