Thomson Reuters Fixed Assets CS 13.1.4 - Local Privilege Escalation

# Exploit Title: Thomson Reuters Fixed Assets CS <=13.1.4 Local Privilege
Escalation/Code Execution



# Date: 12/1/14

# Exploit Author: [email protected]

# Vendor Homepage: https://cs.thomsonreuters.com

# Version: Fixed Assets CS <=13.1.4 Local Privilege Escalation/Code
Execution

# Tested on: Windows XP -> Windows 7, Windows 8

# CVE : 2014-9141



Product Affected:


Fixed Assets CS <=13.1.4 (Workstation Install)


Note: 2003/2008 Terminal Services/Published apps **may** be vulnerable,
depending on system configuration.


This vulnerability has been reference checked against multiple

installs. This configuration was identical across all systems and each

version encountered.


Executables/Services:


C:\WinCSI\Tools\connectbgdl.exe


Attack Detail:


The Fixed Assets CS installer places a system startup item at
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup


Which then executes the utility at C:\WinCSI\Tools\connectbgdl.exe.










The executables that are installed, by default, allow AUTHENTICATED USERS


to modify, replace or alter the file.





This would allow an attacker to inject their code or replace the executable
and have it run in the context


of an authenticated user.



An attacker can use this to escalate privileges to the highest privileged
level of user to sign on to the system. This would require them to stop the
vulnerable executable


or reboot the system. The executable appears to only allow on instance to
be executed at a time by default, the attacker would need to restart or
kill the process. These are the default settings for this process.






This could compromise a machine on which it was


installed, giving the process/attacker access to the machine in


question or execute code as that user.



An attacker can replace the file or append code to the


executable, reboot the system or kill the process and it would then


compromise the machine when a higher privileged user (administrator) logged
in.



This affects workstation builds. It may be possible on legacy
servers/published application platforms but this was not tested.




Remediation:



Remove the modify/write permissions on the executables to allow only


privileged users to alter the files.


Apply vendor patch when distributed.




Vulnerability Discovered: 11/27/2014


Vendor Notified: 12/1/2014






Website: www.information-paradox.net


This vulnerability was discovered by [email protected]. Please


credit the author in all references to this exploit.