Bugzilla – Bug 1070163
VUL-0: CVE-2017-17565: xen: improper bug check in x86 log-dirty handling (XSA-251)
Last modified: 2021-01-21 18:19:59 UTC
Created attachment 750408 [details] Upstream patches Xen Security Advisory XSA-251 improper bug check in x86 log-dirty handling *** EMBARGOED UNTIL 2017-12-12 12:00 UTC *** ISSUE DESCRIPTION ================= Memory sharing, available to x86 HVM guests only, uses a special value in the global machine to physical address translation table (M2P). PV guests have full control over M2P entries corresponding to pages they own. A bug check (specifically, an assertion that an M2P entry is not the special "shared" indicator) was insufficiently qualified, and as a consequence is triggerable by PV guests in log-dirty mode (e.g. because of being live migrated). IMPACT ====== A malicious or buggy PV guest may cause a hypervisor crash, resulting in a Denial of Service (DoS) affecting the entire host. VULNERABLE SYSTEMS ================== Xen versions 4.0 and later are affected. Xen versions 3.4 and earlier are not affected. Only x86 systems are vulnerable. ARM systems are not vulnerable. x86 HVM guests cannot exploit this vulnerability. Only x86 PV guests can exploit this vulnerability, and only when being run in shadow mode. PV guests are typically run in shadow mode for live migration, as well as for features like VM snapshot. Note that save / restore does *not* use shadow mode, and so does not expose this vulnerability. Some downstreams also include a "non-live migration" feature, which also does not use shadow mode (and thus does not expose this vulnerability). MITIGATION ========== Running only HVM guests avoids the vulnerability. Avoiding live migration of x86 PV guests also avoids the vulnerability. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa251.patch xen-unstable, Xen 4.9.x xsa251-4.8.patch Xen 4.8.x, Xen 4.7.x, Xen 4.6.x xsa251-4.5.patch Xen 4.5.x $ sha256sum xsa251* 56e6f21b3b769996d59dd34768e305a9c05d4c21327ee2f7e30e39989213d586 xsa251.meta 0dfbcfe459f051abb571d3fbedbe9760a4c6cd540ab5d525627050e3eeb9234e xsa251.patch 345a6e004e0d0d89c7fc8db55d48d68f53402a521bd1aa3cb4168043e1ae5673 xsa251-4.5.patch f8cecf013a3628038e0a4566778852a560b25a1ce2f3872a989087ab2fc9a913 xsa251-4.8.patch
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CVE-2017-17565 was assigned to this issue.
SUSE-SU-2018:0438-1: An update that solves 10 vulnerabilities and has three fixes is now available. Category: security (important) Bug References: 1027519,1035442,1051729,1061081,1067317,1068032,1070158,1070159,1070160,1070163,1074562,1076116,1076180 CVE References: CVE-2017-15595,CVE-2017-17563,CVE-2017-17564,CVE-2017-17565,CVE-2017-17566,CVE-2017-18030,CVE-2017-5715,CVE-2017-5753,CVE-2017-5754,CVE-2018-5683 Sources used: SUSE Linux Enterprise Software Development Kit 12-SP3 (src): xen-4.9.1_08-3.26.1 SUSE Linux Enterprise Server 12-SP3 (src): xen-4.9.1_08-3.26.1 SUSE Linux Enterprise Desktop 12-SP3 (src): xen-4.9.1_08-3.26.1 SUSE CaaS Platform ALL (src): xen-4.9.1_08-3.26.1
openSUSE-SU-2018:0459-1: An update that solves 10 vulnerabilities and has three fixes is now available. Category: security (important) Bug References: 1027519,1035442,1051729,1061081,1067317,1068032,1070158,1070159,1070160,1070163,1074562,1076116,1076180 CVE References: CVE-2017-15595,CVE-2017-17563,CVE-2017-17564,CVE-2017-17565,CVE-2017-17566,CVE-2017-18030,CVE-2017-5715,CVE-2017-5753,CVE-2017-5754,CVE-2018-5683 Sources used: openSUSE Leap 42.3 (src): xen-4.9.1_08-16.1
SUSE-SU-2018:0472-1: An update that solves 10 vulnerabilities and has two fixes is now available. Category: security (important) Bug References: 1027519,1035442,1051729,1061081,1068032,1070158,1070159,1070160,1070163,1074562,1076116,1076180 CVE References: CVE-2017-15595,CVE-2017-17563,CVE-2017-17564,CVE-2017-17565,CVE-2017-17566,CVE-2017-18030,CVE-2017-5715,CVE-2017-5753,CVE-2017-5754,CVE-2018-5683 Sources used: SUSE Linux Enterprise Software Development Kit 12-SP2 (src): xen-4.7.4_06-43.24.1 SUSE Linux Enterprise Server 12-SP2 (src): xen-4.7.4_06-43.24.1 SUSE Linux Enterprise Desktop 12-SP2 (src): xen-4.7.4_06-43.24.1
SUSE-SU-2018:0601-1: An update that solves 10 vulnerabilities and has three fixes is now available. Category: security (important) Bug References: 1027519,1035442,1061081,1068032,1070158,1070159,1070160,1070163,1074562,1076116,1076180,1080635,1080662 CVE References: CVE-2017-15595,CVE-2017-17563,CVE-2017-17564,CVE-2017-17565,CVE-2017-17566,CVE-2017-18030,CVE-2017-5715,CVE-2017-5753,CVE-2017-5754,CVE-2018-5683 Sources used: SUSE Linux Enterprise Server 12-LTSS (src): xen-4.4.4_28-22.62.1
SUSE-SU-2018:0609-1: An update that solves 10 vulnerabilities and has two fixes is now available. Category: security (important) Bug References: 1035442,1061081,1068032,1070158,1070159,1070160,1070163,1074562,1076116,1076180,1080635,1080662 CVE References: CVE-2017-15595,CVE-2017-17563,CVE-2017-17564,CVE-2017-17565,CVE-2017-17566,CVE-2017-18030,CVE-2017-5715,CVE-2017-5753,CVE-2017-5754,CVE-2018-5683 Sources used: SUSE OpenStack Cloud 6 (src): xen-4.5.5_24-22.43.1 SUSE Linux Enterprise Server for SAP 12-SP1 (src): xen-4.5.5_24-22.43.1 SUSE Linux Enterprise Server 12-SP1-LTSS (src): xen-4.5.5_24-22.43.1
SUSE-SU-2018:0638-1: An update that solves 10 vulnerabilities and has four fixes is now available. Category: security (important) Bug References: 1027519,1031382,1035442,1061081,1068032,1070158,1070159,1070160,1070163,1074562,1076116,1076180,1080635,1080662 CVE References: CVE-2017-15595,CVE-2017-17563,CVE-2017-17564,CVE-2017-17565,CVE-2017-17566,CVE-2017-18030,CVE-2017-5715,CVE-2017-5753,CVE-2017-5754,CVE-2018-5683 Sources used: SUSE Linux Enterprise Software Development Kit 11-SP4 (src): xen-4.4.4_28-61.23.2 SUSE Linux Enterprise Server 11-SP4 (src): xen-4.4.4_28-61.23.2 SUSE Linux Enterprise Debuginfo 11-SP4 (src): xen-4.4.4_28-61.23.2
SUSE-SU-2018:0678-1: An update that fixes 14 vulnerabilities is now available. Category: security (important) Bug References: 1024307,1030144,1061081,1068032,1070158,1070159,1070160,1070163,1074562,1076116,1076180,1080635,1080662 CVE References: CVE-2017-11334,CVE-2017-15595,CVE-2017-17563,CVE-2017-17564,CVE-2017-17565,CVE-2017-17566,CVE-2017-18030,CVE-2017-5715,CVE-2017-5753,CVE-2017-5754,CVE-2017-5898,CVE-2018-5683,CVE-2018-7540,CVE-2018-7541 Sources used: SUSE Linux Enterprise Server 11-SP3-LTSS (src): xen-4.2.5_21-45.19.1 SUSE Linux Enterprise Point of Sale 11-SP3 (src): xen-4.2.5_21-45.19.1 SUSE Linux Enterprise Debuginfo 11-SP3 (src): xen-4.2.5_21-45.19.1
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