The do_hvm_op function in xen/arch/x86/hvm/hvm.c in Xen 4.2.x on the x86_32 platform does not prevent HVM_PARAM_NESTEDHVM (aka nested virtualization) operations, which allows guest OS users to cause a denial of service (long-duration page mappings and host OS crash) by leveraging administrative access to an HVM guest in a domain with a large number of VCPUs.

XEN was updated to 4.2.2, fixing lots of bugs and several security issues.

Various upstream patches were also merged into this version by our developers.

Detailed buglist :

  - bnc#824676 - Failed to setup devices for vm instance     when start multiple vms simultaneously

  - bnc#817799 - sles9sp4 guest fails to start after     upgrading to sles11 sp3

  - bnc#826882 - xen: CVE-2013-1432: XSA-58: Page reference     counting error due to XSA-45/CVE-2013-1918 fixes

  - Add upstream patch to fix devid assignment in libxl     27184-libxl-devid-fix.patch

  - bnc#823608 - xen: XSA-57: libxl allows guest write     access to sensitive console related xenstore keys     27178-libxl-Restrict-permissions-on-PV-console-device-xe     nstore-nodes.patch

  - bnc#823011 - xen: XSA-55: Multiple vulnerabilities in     libelf PV kernel handling

  - bnc#808269 - Fully Virtualized Windows VM install is     failed on Ivy Bridge platforms with Xen kernel

  - bnc#801663 - performance of mirror lvm unsuitable for     production block-dmmd

  - bnc#817904 - [SLES11SP3 BCS Bug] Crashkernel fails to     boot after panic on XEN kernel SP3 Beta 4 and RC1

  - Upstream AMD Erratum patch from Jan

  - bnc#813675 - - xen: CVE-2013-1919: XSA-46: Several     access permission issues with IRQs for unprivileged     guests

  - bnc#820917 - CVE-2013-2076: xen: Information leak on     XSAVE/XRSTOR capable AMD CPUs (XSA-52)

  - bnc#820919 - CVE-2013-2077: xen: Hypervisor crash due to     missing exception recovery on XRSTOR (XSA-53)

  - bnc#820920 - CVE-2013-2078: xen: Hypervisor crash due to     missing exception recovery on XSETBV (XSA-54)

  - bnc#808085 - aacraid driver panics mapping INT A when     booting kernel-xen

  - bnc#817210 - openSUSE 12.3 Domain 0 doesn't boot with     i915 graphics controller under Xen with VT-d enabled

  - bnc#819416 - xen: CVE-2013-2072: XSA-56: Buffer overflow     in xencontrol Python bindings affecting xend

  - bnc#818183 - xen: CVE-2013-2007: XSA-51: qga set umask     0077 when daemonizing

  - add lndir to BuildRequires

  - remove     xen.migrate.tools_notify_restore_to_hangup_during_migrat     ion_--abort_if_busy.patch It changed migration protocol     and upstream wants a different solution

  - bnc#802221 - fix xenpaging readd     xenpaging.qemu.flush-cache.patch

  - bnc#808269 - Fully Virtualized Windows VM install is     failed on Ivy Bridge platforms with Xen kernel

  - Additional fix for bnc#816159     CVE-2013-1918-xsa45-followup.patch

  - bnc#817068 - Xen guest with >1 sr-iov vf won't start

  - Update to Xen 4.2.2 c/s 26064 The following recent     security patches are included in the tarball     CVE-2013-0151-xsa34.patch (bnc#797285)     CVE-2012-6075-xsa41.patch (bnc#797523)     CVE-2013-1917-xsa44.patch (bnc#813673)     CVE-2013-1919-xsa46.patch (bnc#813675)

  - bnc#816159 - xen: CVE-2013-1918: XSA-45: Several long     latency operations are not preemptible

  - bnc#816163 - xen: CVE-2013-1952: XSA-49: VT-d interrupt     remapping source validation flaw for bridges

  - bnc#809662 - can't use pv-grub to start domU (pygrub     does work) xen.spec

  - bnc#814709 - Unable to create XEN virtual machines in     SLED 11 SP2 on Kyoto

  - bnc#813673 - CVE-2013-1917: xen: Xen PV DoS     vulnerability with SYSENTER

  - bnc#813675 - CVE-2013-1919: xen: Several access     permission issues with IRQs for unprivileged guests

  - bnc#814059 - xen: qemu-nbd format-guessing due to     missing format specification

The remote host is affected by the vulnerability described in GLSA-201309-24 (Xen: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Xen. Please review the       CVE identifiers referenced below for details.
  Impact :

    Guest domains could possibly gain privileges, execute arbitrary code, or       cause a Denial of Service on the host domain (Dom0). Additionally, guest       domains could gain information about other virtual machines running on       the same host or read arbitrary files on the host.
  Workaround :

    The CVEs listed below do not currently have fixes, but only apply to Xen       setups which have &ldquo;tmem&rdquo; specified on the hypervisor command line.
      TMEM is not currently supported for use in production systems, and       administrators using tmem should disable it.
      Relevant CVEs:
      * CVE-2012-2497
      * CVE-2012-6030
      * CVE-2012-6031
      * CVE-2012-6032
      * CVE-2012-6033
      * CVE-2012-6034
      * CVE-2012-6035
      * CVE-2012-6036

Two security fixes from nested virtualization (CVE-2013-0151 CVE-2013-0152), restore status option to xend which is used by libvirt Buffer overflow when processing large packets in qemu e1000 device driver [XSA-41, CVE-2012-6075]

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
75130	openSUSE Security Update : xen (openSUSE-SU-2013:1404-1)	Nessus	SuSE Local Security Checks	high
70184	GLSA-201309-24 : Xen: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
64418	Fedora 18 : xen-4.2.1-5.fc18 (2013-1434)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2013-0151

high

Tenable Plugins

high

high

medium