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Red Hat 5: RHSA-2008:0892-01 Important: Xen Denial of Service

red hat
Calendar Grey October 1, 2008
Dist Redhat Esm H88
Red Hat issues a significant advisory concerning xen packages that rectify security vulnerabilities alongside a major bug repair for RHEL 5.
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 secur...

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

Summary

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.

Topics%20covered

Topics Covered

security advisory Red Hat bug fix important Denial of Service xen Privilege Escalation

References

https://www.cve.org/CVERecord?id=CVE-2008-1945 https://www.cve.org/CVERecord?id=CVE-2008-1952 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux Desktop (v. 5 client):
Source:
i386: xen-debuginfo-3.0.3-64.el5_2.3.i386.rpm xen-libs-3.0.3-64.el5_2.3.i386.rpm
x86_64: xen-debuginfo-3.0.3-64.el5_2.3.i386.rpm xen-debuginfo-3.0.3-64.el5_2.3.x86_64.rpm xen-libs-3.0.3-64.el5_2.3.i386.rpm xen-libs-3.0.3-64.el5_2.3.x86_64.rpm
RHEL Desktop Multi OS (v. 5 client):
Source:
i386: xen-3.0.3-64.el5_2.3.i386.rpm xen-debuginfo-3.0.3-64.el5_2.3.i386.rpm xen-devel-3.0.3-64.el5_2.3.i386.rpm
x86_64: xen-3.0.3-64.el5_2.3.x86_64.rpm xen-debuginfo-3.0.3-64.el5_2.3.i386.rpm xen-debuginfo-3.0.3-64.el5_2.3.x86_64.rpm xen-devel-3.0.3-64.el5_2.3.i386.rpm xen-devel-3.0.3-64.el5_2.3.x86_64.rpm
Red Hat Enterprise Linux (v. 5 server):
Source:
i386: xen-debuginfo-3.0.3-64.el5_2.3.i386.rpm xen-libs-3.0.3-64.el5_2.3.i386.rpm
ia64: xen-debuginfo-3.0.3-64.el5_2.3.ia64.rpm xen-libs-3.0.3-64.el5_2.3.ia64.rpm
x86_64: xen-debuginfo-3.0.3-64.el5_2.3.i386.rpm xen-debuginfo-3.0.3-64.el5_2.3.x86_64.rpm xen-libs-3.0.3-64.el5_2.3.i386.rpm xen-libs-3.0.3-64.el5_2.3.x86_64.rpm
RHEL Virtualization (v. 5 server):
Source:
i386: xen-3.0.3-64.el5_2.3.i386.rpm xen-debuginfo-3.0.3-64.el5_2.3.i386.rpm xen-devel-3.0.3-64.el5_2.3.i386.rpm
ia64: xen-3.0.3-64.el5_2.3.ia64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2008:0892-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2008:0892.html
Issue date: 2008-10-01

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.

Topics%20covered

Topics Covered

security advisory Red Hat bug fix important Denial of Service xen Privilege Escalation

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

RHEL Desktop Multi OS (v. 5 client) - i386, x86_64

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, x86_64

RHEL Virtualization (v. 5 server) - i386, ia64, x86_64

Bugs Fixed

445844 - CVE-2008-1945 qemu/kvm/xen: add image format options for USB storage and removable media

447759 - CVE-2008-1952 qemu/xen/kvm: ioemu: Fix PVFB backend to limit frame buffer size

454651 - xen: buffer overflow detected: qcow-create terminated

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