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CERT Coordination Center

kernel-utils sets insecure permissions on "uml_net" utility

Vulnerability Note VU#134025

Original Release Date: 2003-02-11 | Last Revised: 2003-02-11


The uml_net utility, part of the kernel-utils package in Red Hat Linux 8.0, was shipped with incorrect permissions.


User-Mode Linux (UML) is a tool to provide a virtual machine in which to run another copy of Linux. In Red Hat linux 8.0, the kernel-utils package contains the UML utilities. One of the UML utilities, uml_net, was incorrectly shipped setuid root.


Local users could control network interfaces, put interfaces into promiscuous mode, and add and remove arp entries and routes.


Apply a patch as described in the Red Hat bulletin. If a patch cannot be applied, you can remove the suid bit from the uml_net package with the following command:

chmod -s /usr/bin/uml_net

Vendor Information

Affected   Unknown   Unaffected

Red Hat Inc.

Notified:  February 07, 2003 Updated:  February 11, 2003



Vendor Statement


Vendor Information

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


The CERT/CC has no additional comments at this time.

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



Red Hat has credited Johny Robertson for discovering this issue.

This document was written by Shawn Hernan based on information provided by Red Hat and other sources.

Other Information

CVE IDs: CVE-2003-0019
Severity Metric: 15.82
Date Public: 2003-02-07
Date First Published: 2003-02-11
Date Last Updated: 2003-02-11 18:03 UTC
Document Revision: 4

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