Very recently patched Windows zero-day vulnerability (CVE-2019-0859) in win32k.sys let hackers take control of unpatched Windows systems.
Security researchers from Kaspersky team recent addressed this Zero-day vulnerability in win32k.sys while it made an attempt to exploit one of their customers Microsoft Windows operating system.
A Local Privilege Escalation vulnerability was then reported later to Microsoft and released a patch for Zero-day along with 74 other security vulnerabilities.
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This is actually the fifth vulnerability that consecutive exploited Local Privilege Escalation vulnerability in Windows that uncovered by Kaspersky team researchers, here the previous zero-days in very recent past.
- Zero-day exploit (CVE-2018-8453) used in targeted attacks
- A new exploit for zero-day vulnerability CVE-2018-8589
- Zero-day in Windows Kernel Transaction Manager (CVE-2018-8611)
- The fourth horseman: CVE-2019-0797 vulnerability
Zero-day Exploit Process in Windows win32k.sys
This Vulnerability is presented in the CreateWindowEx, a function that
creates an overlapped, pop-up, or child window with an extended style.
Attackers Exploiting this elevation of privilege vulnerability in Windows when Win32k component fails to properly handle objects in memory.
A PowerShell script mainly used by attackers for the post-exploitation process with a Base64 encoded command.
The ultimate goal of this PowerShell script to download a second-stage script from https//pastebin.com.
This Second stage of the PowerShell executes the final stage which is also a PowerShell Script that you can see in below image.
According to Kaspersky, the third script is very simple and does the following:
- Unpacks shellcode
- Allocates executable memory
- Copies shellcode to the allocated memory
- Calls CreateThread to execute shellcode
At the final stage, the shellcode is to make a trivial HTTP reverse shell that leads to attackers gain complete control of the targeted victims Windows system.
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Also Read:
Unpatched Internet Explorer Zero-day Vulnerability Lets Attackers Hack Windows PC & Steal Files
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