![]() ![]() This can be done by different applications. It is important to note that an administrative user or process must (1) set the directory ACLs to allow access to non-admin user accounts, and (2) modify the system’s PATH variable to include that directory. This makes the privilege escalation simple and allows a regular user to write the missing DLL file and achieve code execution as NT AUTHORITY\SYSTEM. In our VM, the c:\python27 has an ACL which allows any authenticated user to write files onto the ACL. Stay with us, we will analyze the root cause in the next section of the article. Once executed, the service loaded the “Trend Micro White List Module” library tmwlutil.dll and we noticed an interesting behavior:Īs you can see, the service was trying to load a missing DLL file, which eventually was loaded from the c:\python27 directory – a directory within our PATH environment variable. In our exploration, we found that after the Trend Micro Password Manager Central Control Service was started, the PwmSvc.exe signed process was executed as NT AUTHORITY\SYSTEM. This service automatically starts once the computer boots, which means that it’s a potential target for an attacker to be used as a persistence mechanism.The executable of the service is signed by Trend Micro and if the hacker finds a way to execute code within this process, it can be used as an application whitelisting bypass.This kind of service might be exposed to a user-to-SYSTEM privilege escalation, which is very useful and powerful to an attacker. It runs as NT AUTHORITY\SYSTEM – the most privileged user account.In our initial exploration of the software, we targeted the “Trend Micro Password Manager Central Control Service” (PwmSvc.exe), because: We then demonstrate how this vulnerability can be exploited to achieve privilege escalation, gaining access with NT AUTHORITY\SYSTEM level privileges. In this post, we describe the vulnerability we found in the Trend Micro Password Manager. Part of the software runs as a Windows service executed as “NT AUTHORITY\SYSTEM,” which provides it with very powerful permissions. The purpose of the software is to manage website passwords and login IDs in one secure location. Trend Micro Password Manager is a standalone software which is also deployed along with the Trend Micro Maximum Security product. In this post, we will demonstrate how this vulnerability could have been used in order to achieve privilege escalation and persistence by loading an arbitrary unsigned DLL into a service that runs as NT AUTHORITY\SYSTEM. Avira Prime (one-year plan, five devices) - $59.99 $99.SafeBreach Labs discovered a new vulnerability in Trend Micro Password Manager software.Kaspersky Premium Security (one-year plan, 10 devices) - $48.99 $99.99 (save $51).Trend Micro Antivirus (one-year plan, one device) - $19.95 $39.95 (save $20).Sophos Home Premium (one-year plan, unlimited devices) - $44.99 $59.99 (save $15).Avast Premium Security (monthly plan, 10 devices) - $5.79 $8.33 (save $2.54). ![]()
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