Microsoft Remote Installation Service Writable Path Vulnerability

Overview

A vulnerability in the way Microsoft Remote Installation Service handles TFTP may allow a remote, unauthorized attacker to create or overwrite arbitrary operating system files.

Description

Microsoft Remote Installation Service contains a vulnerability in the way that it provides TFTP access. According to Microsoft Security Bulletin ms06-077:

The vulnerability is caused by allowing anonymous access to the file structure of a hosted operating system build through the RIS TFTP service.
Note that this vulnerability has only been reported to affect Microsoft Windows 2000. Microsoft Remote Installation Service is not installed on Microsoft Windows 2000 by default.

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Impact

A remote, unauthenticated attacker may be able to create or overwrite operating system files hosted on the Microsoft Remote Installation Service server, allowing for the insertion of backdoors or other malicious code. As a result, any system subsequently managed by, or installed from the vulnerable Remote Installation Server would be fully compromised.

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Solution

Update
Microsoft has released an update to address this issue. See Microsoft Security Bulletin ms06-077 for more details.

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Apply a Workaround

* Restrict write access to the TFTP service
* Block UDP port 69
* Disable the TFTP service

See Microsoft Security Bulletin ms06-077 for more details.

Vendor Information

238064

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Updated: December 13, 2006

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

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

Addendum

Refer to Microsoft Security Bulletin ms06-077.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23238064 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.microsoft.com/technet/security/bulletin/ms06-077.mspx&gt;
• <http://secunia.com/advisories/23312/&gt;

Acknowledgements

This vulnerability was reported in Microsoft Security Bulletin ms06-077. Microsoft credits Nicolas Ruff for reporting this issue.

This document was written by Chris Taschner.

Other Information

CVE IDs:	CVE-2006-5584
Severity Metric:	28.43 Date Public: