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AUSCERT External Security Bulletin Redistribution
Moderate: spice-xpi security and bug fix update
26 August 2010
AusCERT Security Bulletin Summary
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 5
Red Hat Enterprise Linux WS/Desktop 5
Impact/Access: Overwrite Arbitrary Files -- Existing Account
Unauthorised Access -- Existing Account
Reduced Security -- Existing Account
CVE Names: CVE-2010-2794 CVE-2010-2792
Comment: This advisory references vulnerabilities in products which run on
platforms other than Red Hat. It is recommended that administrators
running spice-xpi check for an updated version of the software for
their operating system.
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Red Hat Security Advisory
Synopsis: Moderate: spice-xpi security and bug fix update
Advisory ID: RHSA-2010:0651-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2010-0651.html
Issue date: 2010-08-25
CVE Names: CVE-2010-2792 CVE-2010-2794
An updated spice-xpi package that fixes two security issues and three bugs
is now available for Red Hat Enterprise Linux 5.
The Red Hat Security Response Team has rated this update as having moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.
2. Relevant releases/architectures:
RHEL Optional Productivity Applications (v. 5 server) - i386, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
The Simple Protocol for Independent Computing Environments (SPICE) is a
remote display protocol used in Red Hat Enterprise Linux for viewing
virtualized guests running on the Kernel-based Virtual Machine (KVM)
hypervisor, or on Red Hat Enterprise Virtualization Hypervisor.
The spice-xpi package provides a plug-in that allows the SPICE client to
run from within Mozilla Firefox.
A race condition was found in the way the SPICE Firefox plug-in and the
SPICE client communicated. A local attacker could use this flaw to trick
the plug-in and the SPICE client into communicating over an
attacker-controlled socket, possibly gaining access to authentication
details, or resulting in a man-in-the-middle attack on the SPICE
It was found that the SPICE Firefox plug-in used a predictable name for its
log file. A local attacker could use this flaw to conduct a symbolic link
attack, allowing them to overwrite arbitrary files accessible to the user
running Firefox. (CVE-2010-2794)
This update also fixes the following bugs:
* a bug prevented users of Red Hat Enterprise Linux 5.5, with all updates
applied, from running the SPICE Firefox plug-in when using Firefox 3.6.4.
With this update, the plug-in works correctly with Firefox 3.6.4 and the
latest version in Red Hat Enterprise Linux 5.5, Firefox 3.6.7. (BZ#618244)
* unused code has been removed during source code refactoring. This also
resolves a bug in the SPICE Firefox plug-in that caused it to close random
file descriptors. (BZ#594006, BZ#619067)
Note: This update should be installed together with the RHSA-2010:0632
qspice-client update: https://rhn.redhat.com/errata/RHSA-2010-0632.html
Users of spice-xpi should upgrade to this updated package, which contains
backported patches to correct these issues. After installing the update,
Firefox must be restarted for the changes to take effect.
Before applying this update, make sure all previously-released errata
relevant to your system have been applied.
This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
5. Bugs fixed (http://bugzilla.redhat.com/):
618244 - SPICE-XPI : Spice cannot be opened from RHEL5.5 client user-portal using FireFox 3.6.4.
620350 - CVE-2010-2792 spice-xpi/qspice-client unix socket race
620356 - CVE-2010-2794 spice-xpi symlink attack
6. Package List:
Red Hat Enterprise Linux Desktop (v. 5 client):
RHEL Optional Productivity Applications (v. 5 server):
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <firstname.lastname@example.org>. More contact
details at https://www.redhat.com/security/team/contact/
Copyright 2010 Red Hat, Inc.
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