Date: Wed, 3 May 2017 13:02:54 +0200
From: Vulnerability Lab <research@...nerability-lab.com>
To: fulldisclosure@...lists.org
Subject: [FD] Icecream v4.53 & Pro - File Permission 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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