Home / mailings [RHSA-2013:0849-01] Important: KVM image security update
Posted on 23 May 2013
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Red Hat Security Advisory
Synopsis: Important: KVM image security update
Advisory ID: RHSA-2013:0849-01
Product: Red Hat Common
Advisory URL: https://rhn.redhat.com/errata/RHSA-2013-0849.html
Issue date: 2013-05-23
CVE Names: CVE-2013-2069
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1. Summary:
The Red Hat Enterprise Linux 6.4 KVM Guest Image for cloud instances had
an empty root password by default.
The Red Hat Security Response Team has rated this update as having
important security impact. A Common Vulnerability Scoring System (CVSS)
base score, which gives a detailed severity rating, is available from the
CVE link in the References section.
2. Description:
Red Hat provides a Red Hat Enterprise Linux 6.4 KVM Guest Image for
cloud instances. This image is provided as a minimally configured system
image which is available for use as-is or for configuration and
customization as required by end users.
The Red Hat Enterprise Linux 6.4 KVM Guest Image for cloud instances had an
empty root password by default. To address this, Red Hat has created an
updated image that locks the root password by default. This updated image
is now available on RHN.
To correct existing Red Hat Enterprise Linux 6.4 KVM Guest Images, any
images or systems built using this Red Hat Enterprise Linux 6.4 KVM Guest
Image, or any currently running Red Hat Enterprise Linux instances
instantiated from this image, users can lock the root password by issuing,
as root, the command:
passwd -l root
Note: The default OpenSSH configuration disallows password logins when
the password is empty, preventing a remote attacker from logging in
without a password.
Root Cause
Kickstart can be used to automate operating system installations. A
Kickstart file specifies settings for an installation. Once the
installation system boots, it can read a Kickstart file and carry out the
installation process without any further input from a user. Kickstart is
used as part of the process of creating Images of Red Hat Enterprise Linux
for cloud providers.
It was discovered that when no 'rootpw' command was specified in a
Kickstart file, the image creator tools gave the root user an empty
password rather than leaving the password locked, which could allow a local
user to gain access to the root account (CVE-2013-2069).
We have corrected this issue by updating the Kickstart file used to build
affected images to lock the password file.
This issue was caused by the way a tool was used to create Images, and not
due to a security vulnerability in Red Hat Enterprise Linux.
To import the image into an OpenStack environment, download the image from
Red Hat Network to a system that has the python-glanceclient package
installed. Refer to the OpenStack Getting Started Guide, linked to in the
References, for information on importing the image into an OpenStack
environment. After successfully importing, it is also highly recommended
that the "glance delete" command is used to delete any previous versions of
the image that exist in the Glance image registry.
3. Solution:
The updated image is available from RHN, linked to in the References.
4. Bugs fixed (http://bugzilla.redhat.com/):
964299 - CVE-2013-2069 livecd-tools: improper handling of passwords
5. References:
https://www.redhat.com/security/data/cve/CVE-2013-2069.html
https://access.redhat.com/security/updates/classification/#important
https://rhn.redhat.com/rhn/software/channel/downloads/Download.do?cid=16952
https://access.redhat.com/site/documentation/en-US/Red_Hat_OpenStack/2/html/Getting_Started_Guide/ch09s02.html
6. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2013 Red Hat, Inc.
