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Category:   Application (Generic)  >   Spice Vendors:   Red Hat
Red Hat Spice-xpi Bugs Let Local Users Gain Elevated Privileges and Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1025304
SecurityTracker URL:  http://securitytracker.com/id/1025304
CVE Reference:   CVE-2011-0012, CVE-2011-1179   (Links to External Site)
Date:  Apr 7 2011
Impact:   Execution of arbitrary code via local system, Execution of arbitrary code via network, Modification of user information, User access via local system, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Two vulnerabilities were reported in Spice-xpi. A remote user can cause arbitrary code to be executed on the target user's system. A local user can obtain elevated privileges on the target system.

A remote user can create specially crafted HTML that, when loaded by the target user via Mozilla Firefox with the SPICE plug-in enabled, will load an uninitialized pointer and potentially execute arbitrary code on the target system [CVE-2011-1179]. The code will run with the privileges of the target user.

The plug-in uses a predictable name for a log file. A local user can conduct a symbolic link (symlink) attack to overwrite arbitrary files with the privileges of the target user [CVE-2011-0012].

Impact:   A remote user can create HTML that, when loaded by the target user, will execute arbitrary code on the target user's system.

A local user can obtain elevated privileges on the target system.

Solution:   The vendor has issued a fix.

The vendor's advisory is available at:

https://rhn.redhat.com/errata/RHSA-2011-0426.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2011-0426.html (Links to External Site)
Cause:   Access control error, Randomization error, State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry has one or more follow-up message(s) listed below.
Apr 7 2011 (Red Hat Issues Fix) Red Hat Spice-xpi Bugs Let Local Users Gain Elevated Privileges and Remote Users Execute Arbitrary Code
Red Hat has issued a fix for Red Hat Enterprise Linux 5.



 Source Message Contents

Subject:  [RHSA-2011:0426-01] Moderate: spice-xpi security update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: spice-xpi security update
Advisory ID:       RHSA-2011:0426-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-0426.html
Issue date:        2011-04-07
CVE Names:         CVE-2011-0012 CVE-2011-1179 
=====================================================================

1. Summary:

An updated spice-xpi package that fixes two security issues is now
available for Red Hat Enterprise Linux 6.

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:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

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.

An uninitialized pointer use flaw was found in the SPICE Firefox plug-in.
If a user were tricked into visiting a malicious web page with Firefox
while the SPICE plug-in was enabled, it could cause Firefox to crash or,
possibly, execute arbitrary code with the privileges of the user running
Firefox. (CVE-2011-1179)

It was found that the SPICE Firefox plug-in used a predictable name for one
of its log files. 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-2011-0012)

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.

4. Solution:

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
https://access.redhat.com/kb/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

639869 - CVE-2011-0012 spice-xpi: symlink attack on usbrdrctl log file
689931 - CVE-2011-1179 spice-xpi: unitialized pointer writes possible when getting plugin properties

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/spice-xpi-2.4-1.el6_0.2.src.rpm

i386:
spice-xpi-2.4-1.el6_0.2.i686.rpm
spice-xpi-debuginfo-2.4-1.el6_0.2.i686.rpm

x86_64:
spice-xpi-2.4-1.el6_0.2.x86_64.rpm
spice-xpi-debuginfo-2.4-1.el6_0.2.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/spice-xpi-2.4-1.el6_0.2.src.rpm

x86_64:
spice-xpi-2.4-1.el6_0.2.x86_64.rpm
spice-xpi-debuginfo-2.4-1.el6_0.2.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/spice-xpi-2.4-1.el6_0.2.src.rpm

i386:
spice-xpi-2.4-1.el6_0.2.i686.rpm
spice-xpi-debuginfo-2.4-1.el6_0.2.i686.rpm

x86_64:
spice-xpi-2.4-1.el6_0.2.x86_64.rpm
spice-xpi-debuginfo-2.4-1.el6_0.2.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/spice-xpi-2.4-1.el6_0.2.src.rpm

i386:
spice-xpi-2.4-1.el6_0.2.i686.rpm
spice-xpi-debuginfo-2.4-1.el6_0.2.i686.rpm

x86_64:
spice-xpi-2.4-1.el6_0.2.x86_64.rpm
spice-xpi-debuginfo-2.4-1.el6_0.2.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2011-0012.html
https://www.redhat.com/security/data/cve/CVE-2011-1179.html
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2011 Red Hat, Inc.
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