RHSA-2011:0426 - Security Advisory

トピック

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.

説明

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.

解決策

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

影響を受ける製品

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386

修正

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

CVE

• CVE-2011-0012
• CVE-2011-1179

参考資料

• https://access.redhat.com/security/updates/classification/#moderate