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The U.S. Department of Energy
Computer Incident Advisory Capability
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__________________________________________________________
INFORMATION BULLETIN
Microsoft RPC Interface Buffer Overrun Vulnerability
[Microsoft Security Bulletin MS03-026, MS03-039]
July 16, 2003 21:00 GMT Number N-117
[REVISED 1 Aug 2003]
[REVISED 13 Aug 2003]
[REVISED 15 Aug 2003]
[REVISED 22 Aug 2003]
[REVISED 10 SEPT 2003]
______________________________________________________________________________
PROBLEM: A buffer overrun vulnerability exists in the part of the
Windows Remote Procedure Call(RPC) that deals with message
exchange over TCP/IP (Port 135).
PLATFORM: Windows NT 4.0
Windows NT Server 4.0
Windows NT 4.0 Terminal Services Edition
Windows 2000
Windows XP
Windows Server 2003
*NOTE--If you have patched your system with MS03-026 you will
need to patch your system with MS03-039. The patch provided
in MS03-039 supersedes the one included in MS03-026.*
If MS03-026 patches have been installed prior to the discover
of the Blaster worm, your system is secure from the
vulnerability that W32.Blaster is using.
DAMAGE: A successful attacker would be able to run code with Local
System privileges, including installing programs, changing or
deleting data, or creating new accounts with full privileges.
SOLUTION: Apply the respective Microsoft patches.
______________________________________________________________________________
VULNERABILITY The risk is HIGH. A successful attacker needs only to be able
ASSESSMENT: to send an especially crafted packet to port 135 on the target
machine. Sites that block port 135 at their incoming firewall
are only vulnerable to attack by machines inside of the
firewall.
______________________________________________________________________________
LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-117.shtml
ORIGINAL BULLETINS: Released on 9/10/03 -
http://www.microsoft.com/technet/treeview/default.asp?
url=/technet/security/bulletin/MS03-039.asp
Released on 7/16/03 -
http://www.microsoft.com/technet/treeview/default.asp?
url=/technet/security/bulletin/MS03-026.asp
ADDITIONAL
INFORMATION: 9/10/03 - For MS03-039, see CERT's Advisory:
http://www.cert.org/advisories/CA-2003-23.html
7/31/03 - For MS03-026, see CERT's Advisory:
http://www.cert.org/advisories/CA-2003-19.html
______________________________________________________________________________
REVISION HISTORY:
8/01/2003: Added link to CERT Advisory CA-2003-19. Contains additional
information on other vulnerabilities and backdoor port activity.
8/13/2003: re-posted contents of MS bulletin to reflect revisions-to-date
in the technical description workaround information, mitigating
factors, and Service Pack 2 support information.
8/15/2003: Added additional information to PLATFORM section. Added
Microsoft's scanner tool update information. Updated download
links, removed the word "Server" from the NT4 link.
8/22/2003: Updated supercedence information in the Additional Information
section.
9/10/2003: Added new bulletin from Microsoft MS03-039 which supersedes
MS03-026 and updated PLATFORM section.
[***** Start Microsoft Security Bulletin MS03-039 *****]
Microsoft Security Bulletin MS03-039
Buffer Overrun In RPCSS Service Could Allow Code Execution (824146)
Originally posted: September 10, 2003
Summary
Who should read this bulletin: Users running Microsoft ® Windows ®
Impact of vulnerability: Run code of attacker’s choice
Maximum Severity Rating: Critical
Recommendation: System administrators should apply the security patch
immediately
End User Bulletin:
An end user version of this bulletin is available at:
http://www.microsoft.com/security/security_bulletins/ms03-039.asp.
Protect your PC:
Additional information on how you can help protect your PC is available at the
following locations:
End Users can visit http://www.microsoft.com/protect
IT Professionals can visit http://www.microsoft.com/technet/security/tips/
pcprotec.asp
Affected Software:
* Microsoft Windows NT Workstation 4.0
* Microsoft Windows NT Server® 4.0
* Microsoft Windows NT Server 4.0, Terminal Server Edition
* Microsoft Windows 2000
* Microsoft Windows XP
* Microsoft Windows Server 2003
Not Affected Software:
* Microsoft Windows Millennium Edition
Technical details
Technical description:
The fix provided by this patch supersedes the one included in Microsoft Security
Bulletin MS03-026.
Remote Procedure Call (RPC) is a protocol used by the Windows operating system.
RPC provides an inter-process communication mechanism that allows a program
running on one computer to seamlessly access services on another computer. The
protocol itself is derived from the Open Software Foundation (OSF) RPC protocol,
but with the addition of some Microsoft specific extensions.
There are three identified vulnerabilities in the part of RPCSS Service that
deals with RPC messages for DCOM activation— two that could allow arbitrary
code execution and one that could result in a denial of service. The flaws
result from incorrect handling of malformed messages. These particular
vulnerabilities affect the Distributed Component Object Model (DCOM) interface
within the RPCSS Service. This interface handles DCOM object activation requests
that are sent from one machine to another.
An attacker who successfully exploited these vulnerabilities could be able to
run code with Local System privileges on an affected system, or could cause the
RPCSS Service to fail. The attacker could then be able to take any action on
the system, including installing programs, viewing, changing or deleting data,
or creating new accounts with full privileges.
To exploit these vulnerabilities, an attacker could create a program to send a
malformed RPC message to a vulnerable system targeting the RPCSS Service.
Microsoft has released a tool that can be used to scan a network for the
presence of systems which have not had the MS03-039 patch installed. More
details on this tool are available in Microsoft Knowledge Base article 827363.
This tool supersedes the one provided in Microsoft Knowledge Base article
826369. If the tool provided in Microsoft Knowledge Base Article 826369 is used
against a system which has installed the security patch provided with this
bulletin, the superseded tool will incorrectly report that the system is
missing the patch provided in MS03-026. Microsoft encourages customers to run
the latest version of the tool available in Microsoft Knowledge Base article
827363 to determine if their systems are patched.
Mitigating factors:
* Firewall best practices and standard default firewall configurations can help
protect networks from remote attacks originating outside of the enterprise
perimeter. Best practices recommend blocking all ports that are not actually
being used. For this reason, most systems attached to the Internet should
have a minimal number of the affected ports exposed.
* For more information about the ports used by RPC, visit the following
Microsoft Web site: http://www.microsoft.com/technet/prodtechnol/windows2000
serv/reskit/tcpip/part4/tcpappc.asp
Severity Rating: Windows NT 4.0 Server Windows NT 4.0, Terminal Server Edition
Windows 2000 Windows XP Windows Server 2003
Buffer Overrun Vulnerabilities Critical Critical Critical Critical Critical
Denial of Service Vulnerability None None Important None None
Aggregate Severity of all Vulnerabilities Critical Critical Critical Critical
Critical
The above assessment is based on the types of systems affected by the
vulnerability, their typical deployment patterns, and the effect that
exploiting the vulnerability would have on them.
Vulnerability identifier:
Buffer Overrun: CAN-2003-0715
Buffer Overrun: CAN-2003-0528
Denial of Service: CAN-2003-0605
Tested Versions:
Microsoft tested Windows Millennium Edition, Windows NT 4.0 Server, Windows NT
4.0 Terminal Services Edition, Windows 2000, Windows XP and Windows Server 2003
to assess whether they are affected by this vulnerability. Previous versions
are no longer supported, and may or may not be affected by these
vulnerabilities.
Patch availability
Download locations for this patch
* Windows NT Workstation
* Windows NT Server 4.0
* Windows NT Server 4.0, Terminal Server Edition
* Windows 2000
* Windows XP
* Windows XP 64 bit Edition
* Windows XP 64 bit Edition Version 2003
* Windows Server 2003
* Windows Server 2003 64 bit Edition
Additional information about this patch
Installation platforms:
* The Windows NT 4.0 patch can be installed on systems running Service Pack 6a.
The Windows NT 4.0, Terminal Server Edition patch can be installed on systems
running Windows NT 4.0, Terminal Server Edition Service Pack 6.
* The Windows 2000 patch can be installed on systems running Windows 2000
Service Pack 2, Service Pack 3, or Service Pack 4.
* The patch for Windows XP can be installed on systems running Windows XP Gold
or Service Pack 1.
* The patch for Windows Server 2003 can be installed on systems running Windows
Server 2003 Gold.
Inclusion in future service packs:
The fix for this issue will be included in Windows 2000 Service Pack 5, Windows
XP Service Pack 2, and Windows Server 2003 Service Pack 1.
Reboot needed: Yes
Patch can be uninstalled: Yes
Superseded patches:
The fix provided by this patch supersedes the one included in Microsoft
Security Bulletin MS03-026 as well as MS01-048
Verifying patch installation:
* Windows NT 4.0:
To verify that the patch has been installed on the machine, confirm that all
files listed in the file manifest in Knowledge Base article 824146 are present
on the system.
* Windows NT 4.0 Terminal Server Edition:
To verify that the patch has been installed on the machine, confirm that all
files listed in the file manifest in Knowledge Base article 824146 are present
on the system.
* Windows 2000:
To verify that the patch has been installed on the machine, confirm that the
following registry key has been created on the machine: HKEY_LOCAL_MACHINE\
SOFTWARE\Microsoft\Updates\Windows 2000\SP5\KB824146.
To verify the individual files, use the date/time and version information
provided in the file manifest in Knowledge Base article 824146 are present on
the system.
* Windows XP:
* If installed on Windows XP Gold: To verify that the patch has been installed
on the machine, confirm that the following registry key has been created on
the machine: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows XP\SP1\
KB824146
To verify the individual files, use the date/time and version information
provided in the file manifest in Knowledge Base article 824146 are present
on the system.
* If installed on Windows XP Service Pack 1:
To verify that the patch has been installed on the machine, confirm that the
following registry key has been created on the machine: HKEY_LOCAL_MACHINE\
SOFTWARE\Microsoft\Updates\Windows XP\SP2\KB824146.
To verify the individual files, use the date/time and version information
provided in the file manifest in Knowledge Base article 824146 are present on
the system.
* Windows Server 2003:
To verify that the patch has been installed on the machine, confirm that the
following registry key has been created on the machine: HKEY_LOCAL_MACHINE\
SOFTWARE\Microsoft\Updates\Window Server 2003\SP1\KB824146.
To verify the individual files, use the date/time and version information
provided in the file manifest in Knowledge Base article 824146 are present on
the system.
Caveats:
None
Localization:
Localized versions of this patch are available at the locations discussed in
“Patch Availability”.
Obtaining other security patches:
Patches for other security issues are available from the following locations:
* Security patches are available from the Microsoft Download Center, and can be
most easily found by doing a keyword search for "security_patch".
* Patches for consumer platforms are available from the Windows Update web site
Other information:
Acknowledgments
Microsoft thanks eEye Digital Security, NSFOCUS Security Team, and Xue Yong
Zhi and Renaud Deraison from Tenable Network Security for reporting the buffer
overrun vulnerabilities and working with us to protect customers.
Support:
* Microsoft Knowledge Base article 824146 discusses this issue and will be
available approximately 24 hours after the release of this bulletin. Knowledge
Base articles can be found on the Microsoft Online Support web site.
* Technical support is available from Microsoft Product Support Services. There
is no charge for support calls associated with security patches.
Security Resources: The Microsoft TechNet Security Web Site provides additional
information about security in Microsoft products.
Disclaimer:
The information provided in the Microsoft Knowledge Base is provided "as is"
without warranty of any kind. Microsoft disclaims all warranties, either
express or implied, including the warranties of merchantability and fitness
for a particular purpose. In no event shall Microsoft Corporation or its
suppliers be liable for any damages whatsoever including direct, indirect,
incidental, consequential, loss of business profits or special damages, even
if Microsoft Corporation or its suppliers have been advised of the possibility
of such damages. Some states do not allow the exclusion or limitation of
liability for consequential or incidental damages so the foregoing limitation
may not apply.
Revisions:
V1.0 September 10, 2003: Bulletin Created.
[***** End Microsoft Security Bulletin MS03-039 *****]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Microsoft Corporation for the
information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
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