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AUSCERT External Security Bulletin Redistribution
MS15-028: Vulnerability in Windows Task Scheduler Could
Allow Security Feature Bypass
11 March 2015
AusCERT Security Bulletin Summary
Product: Microsoft Windows
Operating System: Windows
Impact/Access: Unauthorised Access -- Existing Account
CVE Names: CVE-2015-0084
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Bulletin Number: MS15-028
Bulletin Title: Vulnerability in Windows Task Scheduler Could Allow Security
KB Article: 3030377
Published Date: March 10, 2015
Description: This security update resolves a privately reported vulnerability
in Microsoft Windows. The vulnerability could allow Security Feature Bypass if
a user runs a specially crafted application that is designed to cause Task
Scheduler to improperly validate impersonation-level security.
This security update resolves a vulnerability in Microsoft Windows. The
vulnerability could allow a user with limited privileges on an affected system
to leverage Task Scheduler to execute files that they do not have permissions
to run. An attacker who successfully exploited this vulnerability could bypass
access control list (ACL) checks and run privileged executables.
This security update is rated Important for all supported editions of Windows
7, Windows Server 2008 R2, Windows 8, Windows Server 2012, Windows RT, Windows
8.1, Windows Server 2012 R2, and Windows RT 8.1.
The following software versions or editions are affected.
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
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 8.1
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2 (Server Core installation)
This update is available via Windows Update only.
Task Scheduler Security Feature Bypass Vulnerability - CVE-2015-0084
A security feature bypass vulnerability exists when Windows Task Scheduler
fails to properly validate and enforce impersonation levels. The vulnerability
could allow a user with limited privileges on an affected system to leverage
Task Scheduler to execute files that they do not have permissions to run.
An attacker who successfully exploited this vulnerability could bypass ACL
checks and run privileged executables. The update addresses the vulnerability
by correcting how Task Scheduler validates impersonation levels.
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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