60 lines
No EOL
2.4 KiB
Text
60 lines
No EOL
2.4 KiB
Text
[Summary]
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The Pronestor service "PNHM" (aka Health Monitoring or HealthMonitor)
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before 8.1.12.0 has "BUILTIN\Users:(I)(F)" permissions for
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the "%PROGRAMFILES(X86)%\proNestor\Outlook add-in for Pronestor\PronestorHealthMonitor.exe" file,
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which allows local users to gain privileges via a Trojan horse PronestorHealthMonitor.exe file.
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During the installation of Pronestors Outlook-Add-In (version 8.1.11.0
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and older) the installer creates a service named PNHM (Pronester
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Health Monitoring) with weak file permission running as SYSTEM.
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The vulnerability allows all "Authenticated Users" to potentially
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execute arbitrary code as SYSTEM on the local system.
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[Additional Information]
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Tested on Windows 7.
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Version: Outlook Add-In 8.1.11.0 and older
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Also tested on version 5.1.6.0 with same result.
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Discovered: 06-nov-2018
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Reported: 07-nov-2018
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Vendor: https://www.pronestor.com/
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Vendor confirmed: True
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Fixed: Version 8.1.12.0
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Attack Type: Local Privilege Escalation
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Vulnerability due to: Insecure Permissions
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Discoverer: PovlTekstTV
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CVE: 2018-19113
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Original link: https://gist.github.com/povlteksttv/8f990e11576e1e90e8fb61acf8646d28
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[Proof]
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C:\Users\povltekst>sc qc PNHM
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SERVICE_NAME: PNHM
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TYPE : 10 WIN32_OWN_PROCESS
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START_TYPE : 2 AUTO_START
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ERROR_CONTROL : 1 NORMAL
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BINARY_PATH_NAME : "C:\Program Files (x86)\proNestor\Outlook add-in for Pronestor\PronestorHealthMonitor.exe"
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LOAD_ORDER_GROUP :
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TAG : 0
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DISPLAY_NAME : Pronestor HealthMonitor
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DEPENDENCIES :
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SERVICE_START_NAME : LocalSystem
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C:\Users\povltekst>icacls 'C:\Program Files (x86)\proNestor\Outlook add-in for Pronestor\PronestorHealthMonitor.exe'
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C:\Program Files (x86)\proNestor\Outlook add-in for Pronestor\PronestorHealthMonitor.exe
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BUILTIN\Users:(I)(F)
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NT AUTHORITY\SYSTEM:(I)(F)
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BUILTIN\Administrators:(I)(F)
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Notice: "BUILIN\Users:(I)(F)". (F) = Full access!
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This means that an authenticated user can change the file
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[Attack Vectors]
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Replace the file "PronestorHealthMonitor.exe" with a malicious file
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also called "PronesterHealthMonitor.exe". Next time the service (PNHM)
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starts, the malicious file will get executed as SYSTEM. The service
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starts on every reboot.
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[Affected Component]
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PronestorHealthMonitor.exe
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This exe will be executed on every reboot by a service named PNHM running as SYSTEM. |