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A privilege escalation vulnerability exists in the Canon TR150 print driver through version 3.71.2.10. During the printer installation process, the driver drops a world-writable DLL (CNMurGE.dll) into a directory under %PROGRAMDATA%. A local attacker can overwrite this DLL with a malicious version. If the timing is correct, the system process printisolationhost will load the attacker's DLL, resulting in code execution with SYSTEM privileges.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a single Metasploit module (canon_driver_privesc.rb) that exploits a local privilege escalation vulnerability (CVE-2021-38085) in Canon TR150 print drivers (version 3.71.2.10 and below) on Windows. The exploit leverages user-writable permissions in the Canon driver directory to overwrite a DLL (CNMurGE.dll) with a malicious payload. By timing the replacement to coincide with the execution of the prnmngr.vbs script (used to add a printer), the exploit causes the PrintIsolationHost.exe process (running as SYSTEM) to load the attacker's DLL, resulting in code execution as NT AUTHORITY\SYSTEM. The module requires a Meterpreter session and is time-sensitive, potentially requiring multiple attempts. The code is written in Ruby and is structured as a standard Metasploit local exploit module, with clear separation of check, exploit, and cleanup routines. Key fingerprintable endpoints include the target DLL path and the printer management script path.
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