Products & Services

Buffer Overrun in Microsoft Windows 2000 Workstation Service (MS03-049)

Advisory ID: cisco-sa-20040129-ms03-049

Revision 1.0

For Public Release 2004 January 29 18:00  UTC (GMT)


This advisory describes a vulnerability that affects Cisco products and applications running on Microsoft Windows 2000.

A vulnerability has been discovered that enables an attacker to execute arbitrary code or perform a denial of service (DoS) against the server. These vulnerabilities were discovered and publicly announced by Microsoft in their Microsoft Security Bulletin MS03-049. More information about the vulnerability can be found at the following URL:

All Cisco products and applications that are using unpatched Microsoft Windows 2000 are vulnerable.

This advisory is available at

Affected Products

This section provides details on affected products.

Vulnerable Products

To determine if a product is vulnerable, review the list below. If the software versions or configuration information are provided, then only those combinations are vulnerable. This is a list of appliance software which needs patches downloaded from Cisco.

  • Cisco CallManager
  • Cisco Building Broadband Service Manager (BBSM)
    - BBSM Version 5.2
    - HotSpot 1.0
  • Cisco Customer Response Application Server (CRA)
  • Cisco Personal Assistant (PA)
  • Cisco Conference Connection (CCC)
  • Cisco Emergency Responder (CER)
  • Cisco IP Call Center Express (IPCC Express)
  • Cisco Internet Service Node (ISN)

Other Cisco products which run on a Microsoft based operating system should strongly consider loading the patch from Microsoft at the following URL:

This list is not all inclusive. Please refer to Microsoft's bulletin if you think you have an affected Microsoft platform.

  • Cisco Unity
  • Cisco Building Broadband Service Manager (BBSM) versions 5.1 and prior
  • Cisco uOne Enterprise Edition
  • Cisco Latitude products
  • Cisco Network Registrar (CNR)
  • Cisco Internet Service Node (ISN)
  • Cisco Intelligent Contact Manager (ICM) (Hosted and Enterprise)
  • Cisco IP Contact Center (IPCC) (Express and Enterprise)
  • Cisco E-mail Manager (CEM)
  • Cisco Collaboration Server (CCS)
  • Cisco Dynamic Content Adapter (DCA)
  • Cisco Media Blender (CMB)
  • TrailHead (Part of the Web Gateway solution)
  • Cisco Networking Services for Active Directory (CNS/AD)
  • Cisco SN 5400 Series Storage Routers (driver to interface to Windows server)
  • CiscoWorks
    - CiscoWorks VPN/Security Management Solution (CWVMS)
    - User Registration Tool
    - Lan Management Solution
    - Routed WAN Management
    - Service Management
    - VPN/Security Management Solution
    - IP Telephony Environment Monitor
    - Small Network Management Solution
    - QoS Policy Manager
    - Voice Manager
  • Cisco Transport Manager (CTM)
  • Cisco Broadband Troubleshooter (CBT)
  • DOCSIS CPE Configurator
  • Cisco Secure Applications
    - Cisco Secure Scanner
    - Cisco Secure Policy Manager (CSPM)
    - Access Control Server (ACS)
  • Videoconferencing Applications
    - IP/VC 3540 Video Rate Matching Module
    - IP/VC 3540 Application Server
  • Cisco IP/TV Server

Products Confirmed Not Vulnerable

No other Cisco products are currently known to be affected by these vulnerabilities.


Default installations of Microsoft Windows 2000 Server automatically enable the Workstation service. This vulnerability is not isolated to Microsoft Windows 2000 Workstation edition.

The Microsoft Windows 2000 Workstation service is vulnerable to buffer overflows and denial of service (DoS) attacks. This vulnerability can be exploited to execute arbitrary code on a computer system or to disrupt normal operation of the server.

The vulnerability has been described in more detail at the following URL:

Vulnerability Scoring Details

Cisco has provided scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding CVSS at .

Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at .


According to Microsoft, an attacker could gain System privileges on an affected system, or could cause the Workstation service to fail. For a full list of symptoms and for the most up to date information, please see Microsoft's Bulletin at the following URL:

Software Versions and Fixes

Affected Cisco IP Telephony Applications: for all versions of Cisco CallManager and all compatible versions of Cisco IP Interactive Voice Response (IP IVR), Cisco IP Call Center Express (IPCC Express), Cisco Personal Assistant (PA), Cisco Emergency Responder (CER), Cisco Conference Connection (CCC), and Cisco Internet Service Node (ISN).

Customers should apply the win-OS-Upgrade-k9.2000-2-5sr4.exe or later package located at the following URL:

Cisco Building Broadband Service Manager

For BBSM Version 5.2, apply BBSM52SP2.exe found at the following URL:

Instructions for installing service patches on BBSM can be found at the following URL:

Cisco HotSpot 1.0

For HotSpot1.0, apply Service Pack 1 available at the following URL:


Currently there are no known active worms exploiting this vulnerability. However, users can protect themselves from the potential infection by applying access control lists (ACLs).

The Workstation service receives packets on UDP and TCP ports 138, 139 and 445. Restricting traffic to these ports may help mitigate the spread of any worm that exploits this vulnerability. Restricting traffic to these ports may also help prevent improper access, DoS, and other non-worm related exploitation.

Please also reference the Microsoft posting for additional workarounds:

Customers who have firewalls, or have deployed Network Intrusion Detection Systems (NIDS) and/or Host Intrusion Detection Systems (HIDS) in their network may be able to use these devices to detect attempted exploitation or protect themselves from exploitation of this vulnerability. Customers with these products should refer to their product documentation from their vendor for information on how to properly configure these devices.

Obtaining Fixed Software

Cisco has made free software available to address this vulnerability for affected customers. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.

Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at, or as otherwise set forth at Downloads at

Do not contact either "" or "" for software upgrades.

Customers with Service Contracts

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at

Customers using Third Party Support Organizations

Customers whose Cisco products are provided or maintained through prior or existing agreement with third-party support organizations such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific customer situations such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.

Customers without Service Contracts

Customers who purchase direct from Cisco but who do not hold a Cisco service contract and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain software patches and bug fixes by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.

  • +1 800 553 2447 (toll free from within North America)
  • +1 408 526 7209 (toll call from anywhere in the world)
  • e-mail:

Have your product serial number available and provide the URL of this notice as evidence of entitlement to a software patch or bug fix. Customers without service contracts should request a software patch or bug fix through the TAC.

Refer to for additional TAC contact information, including special localized telephone numbers and instructions and e-mail addresses for use in various languages.

Exploitation and Public Announcements

The Cisco PSIRT is not aware of any active exploitation of this vulnerability.

Status of this Notice: Final


A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.


This advisory will be posted on Cisco's worldwide website at

In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.

  • (includes CERT/CC)
  • Various internal Cisco mailing lists

Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.

Revision History

Revision 1.0


Initial public release.

Cisco Security Procedures

Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at