MS03-039 Buffer Overrun in RPCSS Flaw

[C:Amie]

MS03-039: A Buffer Overrun in RPCSS May Allow Code Execution

Q824146

Affected Software:

Microsoft Windows Server 2003, 64-Bit Enterprise Edition

Microsoft Windows Server 2003, 64-Bit Datacenter Edition

Microsoft Windows Server 2003, Enterprise Edition

Microsoft Windows Server 2003, Standard Edition

Microsoft Windows Server 2003, Web Edition

Microsoft Windows XP Professional

Microsoft Windows XP Home Edition

Microsoft Windows XP Media Center Edition

Microsoft Windows XP Tablet PC Edition

Microsoft Windows 2000 Advanced Server

Microsoft Windows 2000 Professional

Microsoft Windows 2000 Server

Microsoft Windows 2000 Datacenter Server

Microsoft Windows NT Server 4.0

Microsoft Windows NT Server 4.0 Terminal Server Edition

Microsoft Windows NT Workstation 4.0

Remote Procedure Call (RPC) is a protocol that is used by Windows. RPC provides an inter-process communication mechanism that allows a program that is 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 the Windows RPC service (RPCSS) that deals with RPC messages for DCOM activation. Two of the vulnerabilities might allow arbitrary code to be run; one of the vulnerabilities might result in a denial of service. The flaws result from incorrect handling of malformed messages. These vulnerabilities affect the Distributed Component Object Model (DCOM) interface in RPCSS. This interface handles DCOM object activation requests that are sent by client computers to the server.

An attacker who successfully exploits these vulnerabilities might be able to run code with Local System rights on an affected computer, or could cause RPCSS to stop working. The attacker could then take any action on the computer, including installing programs, viewing, changing, or deleting data, or creating new accounts with full rights.

To exploit these vulnerabilities, an attacker could create an exploit program to send a malformed RPC message that targets RPCSS on a vulnerable server.

Download:

Windows 2003 32-bit

Windows 2003 64-bit

Windows XP 32-bit

Windows XP 64-bit 2002 Edition

Windows XP 64-bit 2003 Edition

Windows 2000 SP2, SP3, SP4

Windows NT 4.0 Workstation

Windows NT 4.0 Server

Windows NT 4.0 Terminal Server

Source:

MSKB824146

[freakyfriday]

is this the RPC worm bug?

[+primortal Subscriber²]

no, but a new worm to use this flaw will be coming down soon. so patch your boxes

[Steven]

Microsoft Security Bulletin MS03-039 Print

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...ns/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/...ps/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

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

http://www.microsoft.com/technet/treeview/...in/MS03-039.asp

[Steven]

  freakyfriday said:

is this the RPC worm bug?

no, it affects the same service, but this PATCH SUPERCEDES THE LAST ONE.

[[yt]]

Thanks for the info.. installing patch now. :)

[OPaul]

Apparently I already have the hotfix, "Windows XP Hotfix - KB824146", was it on WindowsUpdate or something?

[Steven]

yeah...or you installed it via Automatic Updates. :D

[Farquaon]

I applied this patch on a Win 2k system, and now Outlook 2k just freezes on the splash screen? What 2 do?