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AUSCERT External Security Bulletin Redistribution
ESB-2015.1287
MS15-052: Vulnerability in Windows Kernel Could Allow
Security Feature Bypass (3050514)
13 May 2015
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AusCERT Security Bulletin Summary
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Product: Microsoft Windows
Publisher: Microsoft
Operating System: Windows
Impact/Access: Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2015-1674
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS15-052
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MS15-052: Vulnerability in Windows Kernel Could Allow Security Feature Bypass
(3050514)
Bulletin Number: MS15-052
Bulletin Title: Vulnerability in Windows Kernel Could Allow Security Feature
Bypass
Severity: Important
KB Article: 3050514
Version: 1.0
Published Date: May 12, 2015
Executive Summary
This security update resolves a vulnerability in Microsoft Windows. The
vulnerability could allow security feature bypass if an attacker logs on to an
affected system and runs a specially crafted application.
This security update is rated Important for supported editions of Windows 8,
Windows Server 2012, Windows 8.1, and Windows Server 2012 R2. For more
information, see the Affected Software section.
Affected Software
Windows 8 for 32-bit Systems
Windows 8 for x64-based Systems
Windows 8.1 for 32-bit Systems
Windows 8.1 for x64-based Systems
Windows Server 2012
Windows Server 2012 R2
Windows RT[1]
Windows RT 8.1[1]
Windows RT[1]
Windows RT 8.1[1]
[1]This update is available via Windows Update only.
Vulnerability Information
Windows Kernel Security Feature Bypass Vulnerability - CVE-2015-1674
A security feature bypass vulnerability exists when the Windows kernel fails
to properly validate which mode the request comes from, allowing an attacker
to retrieve information that could lead to a Kernel Address Space Layout
Randomization (KASLR) bypass. An attacker who successfully exploited this
vulnerability can then retrieve the base address of cng.sys from a compromised
process.
To exploit this vulnerability, an attacker would have to log on to an affected
system and run a specially crafted application.
Microsoft received information about this vulnerability through coordinated
vulnerability disclosure. When this security bulletin was originally issued
Microsoft had not received any information to indicate that this vulnerability
had been publicly used to attack customers.
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