Icecream 4.53 / Pro Privilege Escalation
Posted on 04 May 2017
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) Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability Labs or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability mainly for incidental or consequential damages so the foregoing limitation may not apply. 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