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AUSCERT External Security Bulletin Redistribution
ESB-2016.0928
Microsoft Security Bulletin MS16-048: Security Update for CSRSS (3148528)
13 April 2016
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AusCERT Security Bulletin Summary
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Product: Microsoft Windows
Publisher: Microsoft
Operating System: Windows 8.1
Windows Server 2012
Windows Server 2012 R2
Windows RT 8.1
Windows 10
Impact/Access: Administrator Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-0151
Reference: https://technet.microsoft.com/en-us/library/security/MS16-048
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Microsoft Security Bulletin MS16-048: Security Update for CSRSS (3148528)
Bulletin Number: MS16-048
Bulletin Title: Security Update for CSRSS
Severity: Important
KB Article: 3148528
Version: 1.0
Published Date: April 12, 2016
Executive Summary
This security update resolves a vulnerability in Microsoft Windows. The
vulnerability could allow security feature bypass if an attacker logs on to a
target system and runs a specially crafted application.
This security update is rated Important for all supported editions of Windows
8.1, Windows Server 2012, Windows Server 2012 R2, Windows RT 8.1, and Windows
10.
The security update addresses the vulnerability by correcting how Windows
manages process tokens in memory.
Affected Software
Windows 8.1 for 32-bit Systems
Windows 8.1 for x64-based Systems
Windows Server 2012
Windows Server 2012 R2
Windows RT 8.1 [1]
Windows 10 for 32-bit Systems [2]
Windows 10 for x64-based Systems [2]
Windows 10 Version 1511 for 32-bit Systems [2]
Windows 10 Version 1511 for x64-based Systems [2]
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2 (Server Core installation)
[1]This update is available via Windows Update.
[2]Windows 10 updates are cumulative. The monthly security release includes
all security fixes for vulnerabilities that affect Windows 10, in addition to
non-security updates. The updates are available via the Microsoft Update
Catalog.
Vulnerability Information
Windows CSRSS Security Feature Bypass Vulnerability - CVE-2016-0151
A security feature bypass vulnerability exists in Microsoft Windows when the
Client-Server Run-time Subsystem (CSRSS) fails to properly manage process
tokens in memory.
An attacker who successfully exploited this vulnerability could run arbitrary
code as an administrator. An attacker could then install programs; view,
change, or delete data; or create new accounts with full user rights.
To exploit this vulnerability, an attacker would first have to log on to the
system. An attacker could then run a specially crafted application that could
exploit the vulnerability and take control of an affected system. The security
update addresses the vulnerability by correcting how Windows manages process
tokens in memory.
The following table contains a link to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability Title CVE number Publicly disclosed Exploited
Windows CSRSS Security Feature Bypass Vulnerability CVE-2016-0151 No No
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