Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2015.0564
MS15-028: Vulnerability in Windows Task Scheduler Could
Allow Security Feature Bypass
11 March 2015
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Windows
Publisher: Microsoft
Operating System: Windows
Impact/Access: Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2015-0084
Original Bulletin:
https://technet.microsoft.com/library/security/ms15-028
- --------------------------BEGIN INCLUDED TEXT--------------------
Bulletin Number: MS15-028
Bulletin Title: Vulnerability in Windows Task Scheduler Could Allow Security
Feature Bypass
Severity: Important
KB Article: 3030377
Version: 1.0
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.
Executive Summary
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.
Affected Software
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[1]
Windows RT 8.1[1]
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core
installation)
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2 (Server Core installation)
[1]This update is available via Windows Update only.
Vulnerability Information
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.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/render.html?cid=1980
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
iQIVAwUBVP+a6xLndAQH1ShLAQI9bg/9EQ6P3ZzxN3ym7qa9yiTp1hkByenre9iC
FWH4OI+R4FyNJe4pUgTq9uWx6QqLLqyW3fDtyPdSKIHL8OYEhiZKKFsjsLZRlJJv
JgBg4/W10ShpkK72aLbr4SmSu3KM2gdAtxVt31PKnhbZO3hnIzyhNtT8KBTd6um5
C5GDU6aCcchS7xrcVEFxYknQWuj8mJa6tFD6Uw2Bywv1AWvVFhN6a3LbDy2p+Xv9
htgFhQo/zl6WhTtf22nkSdV0N3Tyd4Q5wIB/Q7keG4a3Cm+PzzJ+o6ByK/Qc0XRa
ZZZRr1fJB1HgQkMBFBo6I4kmsakb2U/Z9lPgPddMmcyP5IEBXTPHKnQvpyl3Dcc/
SKIejlx84ETrYIuR74hhHxywPpMmNOVzHTU38g3d9PXZ6JmJQBJvwrE/vUn4FZSn
CZEKqucHO8VlSS6+UPf+9BxmZTkpsb+lZ0dSf9r0VS8fbh69U0qaKdNpBj9UZ3a4
GRqDjiqcrLwev3VZQnz4LTxzud6U64jNtH2n7l8QSnIg2Dgk+SKCHQOTLBGYMkp+
951YS15Oe5+aeojaCk4p3wmuw8J+sXhB+aJ7lZo0b5uRLMY3Bs8Gp4pQ9Ci7PU+o
i1snc1lU9slQgijIVqeGGPLe3jfmRzC2PSUooqzFhKIGJMXrAo5MnkEvDMVGqBMb
GZXJNT2/NxM=
=g/V5
-----END PGP SIGNATURE-----