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Microsoft Print Spooler service contains a buffer overflow

Vulnerability Note VU#220821

Original Release Date: 2005-08-09 | Last Revised: 2005-08-11

Overview

A buffer overflow in the Microsoft Print Spooler service may allow a remote attacker to execute arbitrary code on a vulnerable system.

Description

According to Microsoft, the Print Spooler service is

...an executable file that is installed as a service. The spooler is loaded when the operating system starts, and it continues to run until the operating system is shut down. The Print Spooler service manages the printing process, which includes such tasks as retrieving the location of the correct printer driver, loading that driver, spooling high-level function calls into a print job, and scheduling print jobs.

The Print Spooler service (sploolsv.exe) does not properly handle incoming messages, potentially allowing a buffer overflow to occur. If a remote attacker can convince a user to connect to a malicious print server, that attacker may be able to trigger the buffer overflow.

For more information, please refer to MS05-043.

Impact

An unauthenticated remote attacker may be able to execute arbitrary code on a vulnerable system. In addition, this vulnerability can be exploited locally by an attacker that has a valid user account on a vulnerable system.

Solution

Apply an update

Microsoft has addressed this issue in Microsoft Security Bulletin MS05-043.

Disable the Print Spooler service

Microsoft recommends disabling the Print Spooler service to mitigate this vulnerability. MS05-043 lists the following steps to disable the service:

1. Click Start, and then click Control Panel. Alternatively, point to Settings, and then click Control Panel.
2. Double-click Administrative Tools.
3. Double-click Services.
4. Double-click Print Spooler.
5. In the Startup type list, click Disabled.
6. Click Stop, and then click OK.

In addition, issuing the following command from a command prompt will disable the Print Spooler service:

sc stop Spooler & sc config Spooler start= disabled

Note that disabling or removing the Print Spooler service on a system will prevent that system from being able to print either locally or remotely.

Vendor Information

220821
 
Affected   Unknown   Unaffected

Microsoft Corporation

Updated:  August 09, 2005

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Please refer to http://www.microsoft.com/technet/security/bulletin/MS05-043.mspx

If you have feedback, comments, or additional information about this vulnerability, please send us email.


CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A

References

Acknowledgements

This vulnerability was reported in Microsoft Security Bulletin MS05-043 . Microsoft credits Kostya Kortchinsky of CERT RENATER for providing information regarding this vulnerability.

This document was written by Jeff Gennari.

Other Information

CVE IDs: CVE-2005-1984
Severity Metric: 15.12
Date Public: 2005-08-09
Date First Published: 2005-08-09
Date Last Updated: 2005-08-11 19:31 UTC
Document Revision: 22

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