04/13/2017 | Bochum, Author: Ralf Benzmüller

Microsoft patch fixes Office zero-day

The April update for Windows is worth the while it takes. It closes 21 vulnerabilities in 13 components.

The current patches of Microsoft close i.a. a critical vulnerability in Office, which has been exploited by massively spammed Dridex banking trojans. Updating is the best protection.

About a week ago first reports appeared about an unfixed vulnerability in Microsoft Office, which has been actively exploited by malware. A RTF-file is infecting the computer as soon as it is opened in Word. Millions of emails with malicious attachments were allegedly spammed via the Necurs botnet. Opening the attached file installs a variant of Dridex a notorious banking trojan. This is at least what can be read in the press and in forums.

Weak signals

According to our telemetry the picture looks different, at least in German-speaking countries. We have neither seen any significant rise in the activities of exploits nor in banking trojan's. It might be that the spam filter has kept away the malicious files from the computers or the campaign that has been reported about was prevalent in other geographic regions.

Counter measures

This does not necessarily stay this way. So you should be prepared. Your AV is able to block these kinds of attacks with behavior blockers or exploit protection technologies. The attack itself works only if "Protected View" is disabled. So you could change the settings of Word, that Outlook attachments are opened in protected view. This gives you one more opportunity to block the attack. The best option is of course to secure the system.

The current Microsoft update closes this critical vulnerability in Windows, and several others e.g. in Internet Explorer, Edge, .NET, Windows, and Office. Because there is malware in the wild that is actively exploiting these flaws, it is advised to update before cyber criminals grab your PC. 

Overview


ID

Short description

Rating

Affected Software

MS16-037

Cumulative Security Update for Internet Explorer (3148531)
Remote code execution with the current user's privileges if a web page is opened

Critical 
Remote Code Execution

Microsoft Windows, 
Internet Explorer

MS16-038

Cumulative Security Update for Microsoft Edge (3148532) 
Remote code execution with the current user's privileges if a web page is opened

Critical 
Remote Code Execution

Microsoft Windows, 
Microsoft Edge

MS16-039

Security Update for  Microsoft-Grafikkomponente (3148522) 
Opening a specially crafted document or visiting website with embedded Open Type Fonts leads to remote code execution
Critical 
Remote Code Execution

Microsoft Windows, Microsoft .NET Framework,
Microsoft Office, Skype for Business,
Microsoft Lync.

MS16-040

Security Update for Microsoft XML Core Services (3148541) 
Remote code execution when clicking a crafted Link e.g. in emails or on web sites.
Critical 
Remote Code Execution

Microsoft Windows

MS16-041

Security Update for .NET Framework (3148789) 
remote code execution if an attacker with access to the local system executes a malicious application

Important 
Remote Code Execution

Microsoft Windows, 
Microsoft .NET Framework

MS16-042

Security Update for Microsoft Office (3148775) 
Remote code execution with current user's privileges, when opening an Office file.
Critical 
Remote Code Execution

Microsoft Office, 
Microsoft Office Services, and Web Apps

MS16-044

Security Update for Windows OLE (3146706) 
Remote execution of code, if user input is not properly validated in Windows OLE. A successful exploit requires the user to open a prepared application first.

Important 
Remote Code Execution

Microsoft Windows

MS16-045

Security Update for Windows Hyper-V (3143118) 
Running specially crafted code on a guest system can lead to arbitrary code execution on the host system (unless the Hyper-V role is enabled).

Important 
Remote Code Execution

Microsoft Windows
MS16-046
Security Update for sekundären Anmeldedienst (3148538)
Arbitrary code execution as administrator
Important 
Elevation of Privilege

Microsoft Windows

MS16-047

Security Update for SAM- und LSAD-Remoteprotokolle (3148527)
Gain elevated privileges if  an attacker launches a man-in-the-middle (MiTM) attack. An attacker could then force a downgrade of the authentication level of the SAM and LSAD channels and impersonate an authenticated user

Important 
Elevation of Privilege

Microsoft Windows
MS16-048
Security Update for CSRSS (3148528)
Bypassing security features, if an attacker logs on to a target system and runs a specially crafted application

Important 
Security Feature Bypass

Microsoft Windows

MS16-049

Security Update for HTTP.sys (3148795)
 
Denial-of-Service-Angriff, a specially crafted HTTP packet is send to a target system
Important 
Denial of Service

Microsoft Windows
MS16-050
Security Update for Adobe Flash Player (3154132) 
Resolvers vulnerabilities when installing Adobe Flash Player

Critical 
Remote Code Execution

Microsoft Windows, 
Adobe Flash Player

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