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Previous versions are no longer supported, and may or may not be affected by this vulnerability. Microsoft tested Windows Me, Windows NT 4.0, Windows NT 4.0 Terminal Services Edition, Windows 2000, Windows XP and Windows Server 2003, to assess whether they are affected by this vulnerability. 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. To learn more about the ports used by RPC, please refer to: To learn more about securing RPC for client and server please refer to. More robust protocols such as RPC over HTTP are provided for hostile environments. RPC over UDP or TCP is not intended to be used in hostile environments such as the Internet.
For this reason, most machines attached to the Internet should have RPC over TCP or UDP blocked. In the case where these ports are not blocked, or in an intranet configuration, the attacker would not require any additional privileges.īest practices recommend blocking all TCP/IP ports that are not actually being used, and most firewalls including the Windows Internet Connection Firewall (ICF) block those ports by default. For intranet environments, these ports would normally be accessible, but for Internet connected machines, these would normally be blocked by a firewall. To exploit this vulnerability, the attacker would require the ability to send a specially crafted request to port 135, 139, 445 or 593 or any other specifically configured RPC port on the remote machine. To exploit this vulnerability, an attacker would need to send a specially formed request to the remote computer on specific RPC ports.
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The attacker would be able to take any action on the system, including installing programs, viewing changing or deleting data, or creating new accounts with full privileges.
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An attacker who successfully exploited this vulnerability would be able to run code with Local System privileges on an affected system. This interface handles DCOM object activation requests that are sent by client machines to the server. This particular vulnerability affects a Distributed Component Object Model (DCOM) interface with RPC, which listens on RPC enabled ports. The failure results because of incorrect handling of malformed messages.
There is a vulnerability in the part of RPC that deals with message exchange over TCP/IP.
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The protocol itself is derived from the Open Software Foundation (OSF) RPC protocol, but with the addition of some Microsoft specific extensions. RPC provides an inter-process communication mechanism that allows a program running on one computer to seamlessly execute code on a remote system. Remote Procedure Call (RPC) is a protocol used by the Windows operating system. 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.
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If the tool originally provided with this bulletin is used against a system which has installed the security patch provided MS03-039, the outdated tool will incorrectly report that the system is missing the patch provided in MS03-026. The updated tool provided with MS03-039 supersedes the one provided in Microsoft Knowledge Base article 826369. In addition, Microsoft has released security bulletin MS03-039 and an updated scanning tool which supersedes this bulletin and the original scanning tool provided with it. Information regarding these additional ports has been added to the mitigating factors and the Workaround section of the bulletin. Subsequent to the release of this bulletin Microsoft has been made aware that additional ports involving RPC can be used to exploit this vulnerability. Microsoft originally released this bulletin and patch on Jto correct a security vulnerability in a Windows Distributed Component Object Model (DCOM) Remote Procedure Call (RPC) interface. Microsoft Windows NT 4.0 Terminal Services Edition.IT Professionals can visit the Microsoft TechNet Security Center Web site.
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End Users can visit the Protect Your PC Web site.Systems administrators should apply the patch immediatelyĪn end user version of this bulletin is available at:Īdditional information on how you can help protect your PC is available at the following locations: Originally posted: JRevised: SeptemSummary Published: J| Updated: September 10, 2003 Security Bulletin Microsoft Security Bulletin MS03-026 - Critical Buffer Overrun In RPC Interface Could Allow Code Execution (823980)
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