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Microsoft MDAC Function Broadcast Response Buffer Overrun Vulnerability

Risk

High

Date Discovered

January 13, 2004

Description

Microsoft has released an advisory reporting a buffer overrun vulnerability in an MDAC function. This issue is exposed when an application makes a broadcast request to query for SQL Servers on the network and malformed data is returned in the broadcast response. Successful exploitation will allow for code execution in the context of the application using the vulnerable MDAC function. If the application is run with system-level privileges, this could completely compromise a vulnerable system. Exploitation attempts may also result in a denial of service in client applications. Microsoft has reported that this would only result in a denial of service with MDAC 2.8.

Technologies Affected

  • Microsoft MDAC 2.5
  • Microsoft MDAC 2.5 RTM
  • Microsoft MDAC 2.5 SP1
  • Microsoft MDAC 2.5 SP2
  • Microsoft MDAC 2.5 SP3
  • Microsoft MDAC 2.6
  • Microsoft MDAC 2.6 RTM
  • Microsoft MDAC 2.6 SP1
  • Microsoft MDAC 2.6 SP2
  • Microsoft MDAC 2.6 SP2 Refresh
  • Microsoft MDAC 2.7
  • Microsoft MDAC 2.7 RTM Refresh
  • Microsoft MDAC 2.7 SP1
  • Microsoft MDAC 2.7 SP1 Refresh
  • Microsoft MDAC 2.8

Recommendations

Block external access at the network boundary, unless external parties require service.

Use network access controls to filter remote access to MDAC-related ports on client systems, including UDP port 1434. External/remote access to all systems that do not require it should also be filtered to limit exposure to this and other latent vulnerabilities.

Run all software as a nonprivileged user with minimal access rights.

Ensure that any applications that use MDAC are run with the least privileges required. This will limit the consequences of successful exploitation.
Microsoft has released updates to address this issue.

Credits

Announced by the vendor.
Copyright © Symantec Corporation.
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Disclaimer
The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
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