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Title: Unchecked Buffer in MDAC Function Could Enable System
Date: 20 August 2003
- Microsoft Data Access Components 2.5 - Microsoft Data Access Components 2.6 - Microsoft Data Access Components 2.7
Impact: Run code of the attacker's choice Max Risk: Important Bulletin: MS03-033
Microsoft encourages customers to review the Security Bulletins at: http://www.microsoft.com/technet/security/bulletin/MS03-033.asp http://www.microsoft.com/security/security_bulletins/ms03-033.asp
Microsoft Data Access Components (MDAC) is a collection of components that are used to provide database connectivity on Windows platforms. MDAC is a ubiquitous technology, and it is likely to be present on most Windows systems:
MDAC provides the underlying functionality for a number of database operations, such as connecting to remote databases and returning data to a client. When a client system on a network tries to see list of computers that are running SQL Server and that reside on the network, it sends a broadcast request to all the devices that are on the network. Due to a flaw in a specific MDAC component, an attacker could respond with a specially crafted packet that could cause a buffer overflow.
An attacker who successfully exploited this flaw could gain the same level of privileges over the system as the application that initiated the broadcast request. The actions an attacker could carry out would be dependent on the permissions which the application using MDAC ran under. If the application ran with limited privileges, an attacker would be limited accordingly; however, if the application runs under the local system context, the attacker would have the same level of permissions. This could include creating, modifying, or deleting data on the system, or reconfiguring the system. This could also include reformatting the hard disk or running programs of the attacker's choice.
This bulletin supercedes the patch discussed in MS02-040. Customers should install this patch as it contains the fix for the vulnerability discussed in bulletin MS02-040 and the patch discussed in this bulletin.
http://www.microsoft.com/technet/security/bulletin/ms03- 033.asp http://www.microsoft.com/security/security_bulletins/ms03- 033.asp
for information on obtaining this patch.
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