==================================================================== Red Hat Security Advisory Synopsis: Moderate: xen security and bug fix update Advisory ID: RHSA-2009:0003-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2009-0003.html Issue date: 2009-01-07 CVE Names: CVE-2008-4405 CVE-2008-4993 ==================================================================== 1. Summary: Updated xen packages that resolve several security issues and a bug are now available for Red Hat Enterprise Linux 5. This update has been rated as having moderate security impact by the Red Hat Security Response Team. 2. 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 3. Description: The xen packages contain the Xen tools and management daemons needed to manage virtual machines running on Red Hat Enterprise Linux. Xen was found to allow unprivileged DomU domains to overwrite xenstore values which should only be changeable by the privileged Dom0 domain. An attacker controlling a DomU domain could, potentially, use this flaw to kill arbitrary processes in Dom0 or trick a Dom0 user into accessing the text console of a different domain running on the same host. This update makes certain parts of the xenstore tree read-only to the unprivileged DomU domains. (CVE-2008-4405) It was discovered that the qemu-dm.debug script created a temporary file in /tmp in an insecure way. A local attacker in Dom0 could, potentially, use this flaw to overwrite arbitrary files via a symlink attack. Note: This script is not needed in production deployments and therefore was removed and is not shipped with updated xen packages. (CVE-2008-4993) This update also fixes the following bug: * xen calculates its running time by adding the hypervisor's up-time to the hypervisor's boot-time record. In live migrations of para-virtualized guests, however, the guest would over-write the new hypervisor's boot-time record with the boot-time of the previous hypervisor. This caused time-dependent processes on the guests to fail (for example, crond would fail to start cron jobs). With this update, the new hypervisor's boot-time record is no longer over-written during live migrations. All xen users are advised to upgrade to these updated packages, which contain backported patches to resolve these issues. The Xen host must be restarted for the update to take effect. 4. 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 5. Bugs fixed (https://bugzilla.redhat.com/): 464455 - timer stops running after live migrate or dom0 reboot & save/restore of a Xen guest 464817 - CVE-2008-4405 xen: Multiple unsafe uses of guest-writable data from xenstore 470795 - CVE-2008-4993 xen: insecure temporary file use in qemu-dm.debug 6. Package List: Red Hat Enterprise Linux Desktop (v. 5 client): Source: i386: xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm xen-libs-3.0.3-64.el5_2.9.i386.rpm x86_64: xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm xen-debuginfo-3.0.3-64.el5_2.9.x86_64.rpm xen-libs-3.0.3-64.el5_2.9.i386.rpm xen-libs-3.0.3-64.el5_2.9.x86_64.rpm RHEL Desktop Multi OS (v. 5 client): Source: i386: xen-3.0.3-64.el5_2.9.i386.rpm xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm xen-devel-3.0.3-64.el5_2.9.i386.rpm x86_64: xen-3.0.3-64.el5_2.9.x86_64.rpm xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm xen-debuginfo-3.0.3-64.el5_2.9.x86_64.rpm xen-devel-3.0.3-64.el5_2.9.i386.rpm xen-devel-3.0.3-64.el5_2.9.x86_64.rpm Red Hat Enterprise Linux (v. 5 server): Source: i386: xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm xen-libs-3.0.3-64.el5_2.9.i386.rpm ia64: xen-debuginfo-3.0.3-64.el5_2.9.ia64.rpm xen-libs-3.0.3-64.el5_2.9.ia64.rpm x86_64: xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm xen-debuginfo-3.0.3-64.el5_2.9.x86_64.rpm xen-libs-3.0.3-64.el5_2.9.i386.rpm xen-libs-3.0.3-64.el5_2.9.x86_64.rpm RHEL Virtualization (v. 5 server): Source: i386: xen-3.0.3-64.el5_2.9.i386.rpm xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm xen-devel-3.0.3-64.el5_2.9.i386.rpm ia64: xen-3.0.3-64.el5_2.9.ia64.rpm xen-debuginfo-3.0.3-64.el5_2.9.ia64.rpm xen-devel-3.0.3-64.el5_2.9.ia64.rpm x86_64: xen-3.0.3-64.el5_2.9.x86_64.rpm xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm xen-debuginfo-3.0.3-64.el5_2.9.x86_64.rpm xen-devel-3.0.3-64.el5_2.9.i386.rpm xen-devel-3.0.3-64.el5_2.9.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://www.redhat.com/security/team/key/#package 7. References: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4405 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4993 https://www.redhat.com/security/updates/classification/#moderate 8. Contact: The Red Hat security contact is
. More contact details at https://www.redhat.com/security/team/contact/ Copyright 2009 Red Hat, Inc.