Synopsis

Important: xen security and bug fix update

Type/Severity

Security Advisory: Important

Topic

Updated xen packages that resolve a couple of security issues and fix a bug
are now available for Red Hat Enterprise Linux 5.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

Description

The xen packages contain tools for managing the virtual machine monitor in
Red Hat Virtualization.

It was discovered that the hypervisor's para-virtualized framebuffer (PVFB)
backend failed to validate the frontend's framebuffer description properly.
This could allow a privileged user in the unprivileged domain (DomU) to
cause a denial of service, or, possibly, elevate privileges to the
privileged domain (Dom0). (CVE-2008-1952)

A flaw was found in the QEMU block format auto-detection, when running
fully-virtualized guests and using Qemu images written on removable media
(USB storage, 3.5" disks). Privileged users of such fully-virtualized
guests (DomU), with a raw-formatted disk image, were able to write a header
to that disk image describing another format. This could allow such guests
to read arbitrary files in their hypervisor's host (Dom0). (CVE-2008-1945)

Additionally, the following bug is addressed in this update:

• The qcow-create command terminated when invoked due to glibc bounds
  checking on the realpath() function.
  

Users of xen are advised to upgrade to these updated packages, which
resolve these security issues and fix this bug.

Solution

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux Server - Extended Update Support 5.2 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support 5.2 ia64
• Red Hat Enterprise Linux Server - Extended Update Support 5.2 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 445844 - CVE-2008-1945 qemu/kvm/xen: add image format options for USB storage and removable media
• BZ - 447759 - CVE-2008-1952 qemu/xen/kvm: ioemu: Fix PVFB backend to limit frame buffer size
• BZ - 454651 - xen: buffer overflow detected: qcow-create terminated

CVEs

• CVE-2008-1952
• CVE-2008-1945

References

• http://www.redhat.com/security/updates/classification/#important

Red Hat Enterprise Linux Server 5

SRPM
xen-3.0.3-64.el5_2.3.src.rpm	SHA-256: d311fb23a6bdfa754d943e7367a555709dbc93261daee0f77a8d2d8f4d4c7bf2
x86_64
xen-3.0.3-64.el5_2.3.x86_64.rpm	SHA-256: efefbf2c7e8039f1ddc4137ac35295b6a59188e49579f67fc0c64e48c2fda16a
xen-devel-3.0.3-64.el5_2.3.i386.rpm	SHA-256: 2448623cc6e23cee2e37314781b7b5dd5fb8c66ecf73a0d09435f35182fb5962
xen-devel-3.0.3-64.el5_2.3.x86_64.rpm	SHA-256: e5a7b3da077e611457ecc5e1c985fe117531aa63f76c8cf8b566b05810251852
xen-libs-3.0.3-64.el5_2.3.i386.rpm	SHA-256: a6f7a3e65e40839fbe0be0b17cfb6b90ce53745803fd2dfab85a2f57500f7979
xen-libs-3.0.3-64.el5_2.3.x86_64.rpm	SHA-256: d69713195ace6dba8e2924485cc0d56828b9702eef8a74da0385cb993d6de106
ia64
xen-3.0.3-64.el5_2.3.ia64.rpm	SHA-256: d916143ce4da4575520a88aa0bf89cc21cc5431829ff0695d2e399a1fc8cb82f
xen-devel-3.0.3-64.el5_2.3.ia64.rpm	SHA-256: 6d9d022288ae3be8189c0d1eac9ce4186f89f541c8a8e5fc3ba8b9357f643eaa
xen-libs-3.0.3-64.el5_2.3.ia64.rpm	SHA-256: 3dfb2365e78b9a2f85387be2013facc1126a7c5daa849e3b91e179d218b77415
i386
xen-3.0.3-64.el5_2.3.i386.rpm	SHA-256: b79431aa44a3b15d1ba1a4d4e84e51976b16ba5312e4a5d9c955d5d940cadd6e
xen-devel-3.0.3-64.el5_2.3.i386.rpm	SHA-256: 2448623cc6e23cee2e37314781b7b5dd5fb8c66ecf73a0d09435f35182fb5962
xen-libs-3.0.3-64.el5_2.3.i386.rpm	SHA-256: a6f7a3e65e40839fbe0be0b17cfb6b90ce53745803fd2dfab85a2f57500f7979

Red Hat Enterprise Linux Workstation 5

SRPM
xen-3.0.3-64.el5_2.3.src.rpm	SHA-256: d311fb23a6bdfa754d943e7367a555709dbc93261daee0f77a8d2d8f4d4c7bf2
x86_64
xen-3.0.3-64.el5_2.3.x86_64.rpm	SHA-256: efefbf2c7e8039f1ddc4137ac35295b6a59188e49579f67fc0c64e48c2fda16a
xen-devel-3.0.3-64.el5_2.3.i386.rpm	SHA-256: 2448623cc6e23cee2e37314781b7b5dd5fb8c66ecf73a0d09435f35182fb5962
xen-devel-3.0.3-64.el5_2.3.x86_64.rpm	SHA-256: e5a7b3da077e611457ecc5e1c985fe117531aa63f76c8cf8b566b05810251852
xen-libs-3.0.3-64.el5_2.3.i386.rpm	SHA-256: a6f7a3e65e40839fbe0be0b17cfb6b90ce53745803fd2dfab85a2f57500f7979
xen-libs-3.0.3-64.el5_2.3.x86_64.rpm	SHA-256: d69713195ace6dba8e2924485cc0d56828b9702eef8a74da0385cb993d6de106
i386
xen-3.0.3-64.el5_2.3.i386.rpm	SHA-256: b79431aa44a3b15d1ba1a4d4e84e51976b16ba5312e4a5d9c955d5d940cadd6e
xen-devel-3.0.3-64.el5_2.3.i386.rpm	SHA-256: 2448623cc6e23cee2e37314781b7b5dd5fb8c66ecf73a0d09435f35182fb5962
xen-libs-3.0.3-64.el5_2.3.i386.rpm	SHA-256: a6f7a3e65e40839fbe0be0b17cfb6b90ce53745803fd2dfab85a2f57500f7979

Red Hat Enterprise Linux Desktop 5

SRPM
xen-3.0.3-64.el5_2.3.src.rpm	SHA-256: d311fb23a6bdfa754d943e7367a555709dbc93261daee0f77a8d2d8f4d4c7bf2
x86_64
xen-libs-3.0.3-64.el5_2.3.i386.rpm	SHA-256: a6f7a3e65e40839fbe0be0b17cfb6b90ce53745803fd2dfab85a2f57500f7979
xen-libs-3.0.3-64.el5_2.3.x86_64.rpm	SHA-256: d69713195ace6dba8e2924485cc0d56828b9702eef8a74da0385cb993d6de106
i386
xen-libs-3.0.3-64.el5_2.3.i386.rpm	SHA-256: a6f7a3e65e40839fbe0be0b17cfb6b90ce53745803fd2dfab85a2f57500f7979

Red Hat Enterprise Linux Server from RHUI 5

SRPM
xen-3.0.3-64.el5_2.3.src.rpm	SHA-256: d311fb23a6bdfa754d943e7367a555709dbc93261daee0f77a8d2d8f4d4c7bf2
x86_64
xen-libs-3.0.3-64.el5_2.3.i386.rpm	SHA-256: a6f7a3e65e40839fbe0be0b17cfb6b90ce53745803fd2dfab85a2f57500f7979
xen-libs-3.0.3-64.el5_2.3.x86_64.rpm	SHA-256: d69713195ace6dba8e2924485cc0d56828b9702eef8a74da0385cb993d6de106
i386
xen-libs-3.0.3-64.el5_2.3.i386.rpm	SHA-256: a6f7a3e65e40839fbe0be0b17cfb6b90ce53745803fd2dfab85a2f57500f7979