Bugzilla – Bug 849665
VUL-0: CVE-2013-4551: xen: XSA-75: Host crash due to guest VMX instruction execution
Last modified: 2015-02-18 22:33:48 UTC
public via oss-sec CVE-2013-4551 Xen Security Advisory XSA-75 Host crash due to guest VMX instruction execution ISSUE DESCRIPTION ================= Permission checks on the emulation paths (intended for guests using nested virtualization) for VMLAUNCH and VMRESUME were deferred too much. The hypervisor would try to use internal state which is not set up unless nested virtualization is actually enabled for a guest. IMPACT ====== A malicious or misbehaved HVM guest, including malicious or misbehaved user mode code run in the guest, might be able to crash the host. VULNERABLE SYSTEMS ================== Xen 4.2.x and later are vulnerable. Xen 4.1.x and earlier are not vulnerable. Only HVM guests run on VMX capable (e.g. Intel) hardware can take advantage of this vulnerability. MITIGATION ========== Running only PV guests, or running HVM guests on SVM capable (e.g. AMD) hardware will avoid this issue. Enabling nested virtualization for a HVM guest running on VMX capable hardware would also allow avoiding the issue. However this functionality is still considered experimental, and is not covered by security support from the Xen Project security team. This approach is therefore not recommended for use in production. CREDITS ======= This issue was discovered by Jeff Zimmerman. NOTE REGARDING LACK OF EMBARGO ============================== This issue was disclosed publicly on the xen-devel mailing list. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa75-4.3-unstable.patch Xen 4.3.x, xen-unstable xsa75-4.2.patch Xen 4.2.x $ sha256sum xsa75*.patch 0b2da4ede6507713c75e313ba468b1fd7110e5696974ab72e2135f41ee393a8b xsa75-4.2.patch 91936421279fd2fa5321d9ed5a2b71fe76bc0e1348e67126e8b9cde0cb1d32b2 xsa75-4.3-unstable.patch $
Created attachment 566739 [details] xsa75-4.2.patch xsa75-4.2.patch
Created attachment 566740 [details] xsa75-4.3-unstable.patch xsa75-4.3-unstable.patch
bugbot adjusting priority
"P3 - Medium" for an issue where guest _user mode_ can crash the host?
This was submitted for swamp 54914. SLE11-SP3 SR#: 29400 SLE11-SP2 SR#: 29401
openSUSE-SU-2013:1876-1: An update that solves 5 vulnerabilities and has two fixes is now available. Category: security (moderate) Bug References: 845520,848657,849665,849667,849668,851386,851749 CVE References: CVE-2013-4416,CVE-2013-4494,CVE-2013-4551,CVE-2013-4553,CVE-2013-4554 Sources used: openSUSE 13.1 (src): xen-4.3.1_02-4.4
done
Update released for: xen, xen-debuginfo, xen-debugsource, xen-devel, xen-doc-html, xen-doc-pdf, xen-kmp-debug, xen-kmp-default, xen-kmp-pae, xen-kmp-trace, xen-kmp-vmi, xen-libs, xen-libs-32bit, xen-tools, xen-tools-domU Products: SLE-DEBUGINFO 11-SP3 (i386, x86_64) SLE-DESKTOP 11-SP3 (i386, x86_64) SLE-SDK 11-SP3 (i386, x86_64) SLE-SERVER 11-SP3 (i386, x86_64)
SUSE-SU-2013:1923-1: An update that solves 8 vulnerabilities and has two fixes is now available. Category: security (moderate) Bug References: 833483,840997,842417,846849,848014,848657,849665,849667,849668,851386 CVE References: CVE-2013-1922,CVE-2013-2007,CVE-2013-4375,CVE-2013-4416,CVE-2013-4494,CVE-2013-4551,CVE-2013-4553,CVE-2013-4554 Sources used: SUSE Linux Enterprise Software Development Kit 11 SP3 (src): xen-4.2.3_08-0.7.1 SUSE Linux Enterprise Server 11 SP3 (src): xen-4.2.3_08-0.7.1 SUSE Linux Enterprise Desktop 11 SP3 (src): xen-4.2.3_08-0.7.1
openSUSE-SU-2014:0483-1: An update that solves 16 vulnerabilities and has 5 fixes is now available. Category: security (moderate) Bug References: 831120,833251,833483,840997,842417,846849,848014,848657,849665,849667,849668,853048,853049,858311,858496,860163,860165,860300,860302,861256,863297 CVE References: CVE-2013-2212,CVE-2013-4494,CVE-2013-4551,CVE-2013-4553,CVE-2013-4554,CVE-2013-6400,CVE-2013-6885,CVE-2014-1642,CVE-2014-1666,CVE-2014-1891,CVE-2014-1892,CVE-2014-1893,CVE-2014-1894,CVE-2014-1895,CVE-2014-1896,CVE-2014-1950 Sources used: openSUSE 12.3 (src): xen-4.2.4_02-1.26.2