Summary

This security update resolves address space layout randomization (ASLR) security feature bypasses in the JScript and VBScript scripting engines in Microsoft Windows. An attacker could use one of these ASLR bypasses together with another vulnerability, such as a remote code execution vulnerability, to more reliably run arbitrary code on a target system. 

The update addresses the ASLR bypasses by helping to make sure that affected versions of JScript and VBScript correctly implement the ASLR security feature.

Introduction

Microsoft has released security bulletin MS15-053. To learn more about this security bulletin:

How to obtain help and support for this security update

Help installing updates:
Support for Microsoft Update

Security solutions for IT professionals:
TechNet Security Troubleshooting and Support

Help protect your Windows-based computer from viruses and malware:
Virus Solution and Security Center

Local support according to your country:
International Support

More Information

File information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.



  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.1.7601.18xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    GDR

    6.1.7601.22xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

Note The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.



For all supported x64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Jscript.dll

5.8.7601.18811

910,848

03-Apr-2015

03:25

x64

Jscript.dll

5.8.7601.23016

910,848

03-Apr-2015

03:32

x64

Vbscript.dll

5.8.7601.18811

610,304

03-Apr-2015

03:26

x64

Vbscript.dll

5.8.7601.23016

610,304

03-Apr-2015

03:32

x64

Jscript.dll

5.8.7601.18811

717,824

03-Apr-2015

03:06

x86

Jscript.dll

5.8.7601.23016

717,824

03-Apr-2015

03:10

x86

Vbscript.dll

5.8.7601.18811

428,544

03-Apr-2015

03:06

x86

Vbscript.dll

5.8.7601.23016

428,544

03-Apr-2015

03:10

x86

Jscript.dll

5.8.7601.18811

717,824

03-Apr-2015

03:06

x86

Jscript.dll

5.8.7601.23016

717,824

03-Apr-2015

03:10

x86


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