Bugzilla – Bug 1070158
VUL-0: CVE-2017-17566: xen: x86 PV guests may gain access to internally used pages (XSA-248)
Last modified: 2021-01-21 18:19:49 UTC
Created attachment 750402 [details] Upstream patches Xen Security Advisory XSA-248 x86 PV guests may gain access to internally used pages *** EMBARGOED UNTIL 2017-12-12 12:00 UTC *** ISSUE DESCRIPTION ================= Memory management for PV guests builds on page ownership and page attributes. A domain can always map, at least r/o, pages of which it is the owner. Certain fields in the control structure of a page are used for different purposes in the main PV memory management code and in code handling shadow paging. When a guest is running in shadow mode (which for PV guests is necessary e.g. for live migration), certain auxiliary pages used by Xen internally had their owner set to the guest itself. When the PV guest maps such a page, shadow code and PV memory management code will disagree on the meaning of said multi-purpose fields, generally leading to a crash of the hypervisor. IMPACT ====== A malicious or buggy PV guest may cause a hypervisor crash, resulting in a Denial of Service (DoS) affecting the entire host, or cause hypervisor memory corruption. We cannot rule out a guest being able to escalate its privilege. VULNERABLE SYSTEMS ================== All versions of Xen are vulnerable. Only x86 systems are affected. 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. xsa248.patch xen-unstable, Xen 4.9.x xsa248-4.8.patch Xen 4.8.x, Xen 4.7.x, Xen 4.6.x xsa248-4.5.patch Xen 4.5.x $ sha256sum xsa248* 20bcfb1890d90bd74f52e45a1e8aa020a8991e3a0db37eecf53ce48b16e602bf xsa248.patch ec4227633df18f76fbd8cb12e367879470b63fb5236f10b2a971dccef9f83172 xsa248-4.5.patch 3bbd9fd92e5ffab1ddd7ff804bfbab09c1c654af3aa7f80f742f321da120b715 xsa248-4.8.patch
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CVE-2017-17566 was assigned to this issue.
Wherever this and the others for 249, 250, and 251 have come from - could you please inform security@xenproject.org about their existence? Thanks.
I mailed the 4 new CVEs with XSA reference to that address
That has been over two hours ago, and so far no mail has arrived at that reflector.
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
I think all released.