Bugzilla – Bug 1154448
VUL-0: CVE-2019-18420: xen: XSA-296 v4: VCPUOP_initialise DoS
Last modified: 2024-04-15 12:21:40 UTC
now public through https://xenbits.xen.org/xsa/advisory-296.html Xen Security Advisory CVE-2019-18420 / XSA-296 version 4 VCPUOP_initialise DoS UPDATES IN VERSION 4 ==================== Public release. ISSUE DESCRIPTION ================= hypercall_create_continuation() is a variadic function which uses a printf-like format string to interpret its parameters. Error handling for a bad format character was done using BUG(), which crashes Xen. One path, via the VCPUOP_initialise hypercall, has a bad format character. The BUG() can be hit if VCPUOP_initialise executes for a sufficiently long period of time for a continuation to be created. IMPACT ====== Malicious guests may cause a hypervisor crash, resulting in a Denial of Service (Dos). VULNERABLE SYSTEMS ================== Xen versions 4.6 and newer are vulnerable. Xen versions 4.5 and earlier are not vulnerable. Only x86 PV guests can exploit the vulnerability. HVM and PVH guests, and guests on ARM systems, cannot exploit the vulnerability. MITIGATION ========== There are no mitigations. CREDITS ======= This issue was discovered by Andrew Cooper of Citrix. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa296.patch Xen 4.9 ... unstable xsa296-4.8.patch Xen 4.7 ... 4.8 $ sha256sum xsa296* 71bd433f788dd511fad90165bc5ba9bcabe949eecd912f2a616e3c996960d67d xsa296.meta ccfd81b162b8535d952f56b1f87dfdd960e71bf07c1cf8388976e78e2e86cde5 xsa296.patch b283be3df6789402553172b7fd582bfffb4fa72a6b33543439bd2fb1b87bfbd4 xsa296-4.8.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) For more information about permissible uses of embargoed information, consult the Xen Project community's agreed Security Policy: http://www.xenproject.org/security-policy.html
SUSE-SU-2019:2961-1: An update that solves 8 vulnerabilities and has one errata is now available. Category: security (important) Bug References: 1027519,1152497,1154448,1154456,1154458,1154460,1154461,1154464,1155945 CVE References: CVE-2018-12207,CVE-2019-11135,CVE-2019-18420,CVE-2019-18421,CVE-2019-18422,CVE-2019-18423,CVE-2019-18424,CVE-2019-18425 Sources used: SUSE Linux Enterprise Module for Server Applications 15-SP1 (src): xen-4.12.1_04-3.6.1 SUSE Linux Enterprise Module for Open Buildservice Development Tools 15-SP1 (src): xen-4.12.1_04-3.6.1 SUSE Linux Enterprise Module for Basesystem 15-SP1 (src): xen-4.12.1_04-3.6.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2019:2962-1: An update that fixes 6 vulnerabilities is now available. Category: security (important) Bug References: 1152497,1154448,1154456,1154458,1154461,1155945 CVE References: CVE-2018-12207,CVE-2019-11135,CVE-2019-18420,CVE-2019-18421,CVE-2019-18424,CVE-2019-18425 Sources used: SUSE Linux Enterprise Software Development Kit 12-SP4 (src): xen-4.11.2_04-2.17.1 SUSE Linux Enterprise Server 12-SP4 (src): xen-4.11.2_04-2.17.1 SUSE Linux Enterprise Desktop 12-SP4 (src): xen-4.11.2_04-2.17.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2019:2960-1: An update that fixes 6 vulnerabilities is now available. Category: security (important) Bug References: 1152497,1154448,1154456,1154458,1154461,1155945 CVE References: CVE-2018-12207,CVE-2019-11135,CVE-2019-18420,CVE-2019-18421,CVE-2019-18424,CVE-2019-18425 Sources used: SUSE Linux Enterprise Module for Server Applications 15 (src): xen-4.10.4_06-3.25.1 SUSE Linux Enterprise Module for Basesystem 15 (src): xen-4.10.4_06-3.25.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
openSUSE-SU-2019:2506-1: An update that fixes 6 vulnerabilities is now available. Category: security (important) Bug References: 1152497,1154448,1154456,1154458,1154461,1155945 CVE References: CVE-2018-12207,CVE-2019-11135,CVE-2019-18420,CVE-2019-18421,CVE-2019-18424,CVE-2019-18425 Sources used: openSUSE Leap 15.0 (src): xen-4.10.4_06-lp150.2.25.1
SUSE-SU-2019:3297-1: An update that fixes 15 vulnerabilities is now available. Category: security (important) Bug References: 1152497,1154448,1154456,1154458,1154460,1154461,1154464,1155945,1157888,1158003,1158004,1158005,1158006,1158007 CVE References: CVE-2018-12207,CVE-2019-11135,CVE-2019-18420,CVE-2019-18421,CVE-2019-18422,CVE-2019-18423,CVE-2019-18424,CVE-2019-18425,CVE-2019-19577,CVE-2019-19578,CVE-2019-19579,CVE-2019-19580,CVE-2019-19581,CVE-2019-19582,CVE-2019-19583 Sources used: SUSE OpenStack Cloud Crowbar 8 (src): xen-4.9.4_06-3.59.1 SUSE OpenStack Cloud 8 (src): xen-4.9.4_06-3.59.1 SUSE Linux Enterprise Server for SAP 12-SP3 (src): xen-4.9.4_06-3.59.1 SUSE Linux Enterprise Server 12-SP3-LTSS (src): xen-4.9.4_06-3.59.1 SUSE Linux Enterprise Server 12-SP3-BCL (src): xen-4.9.4_06-3.59.1 SUSE Enterprise Storage 5 (src): xen-4.9.4_06-3.59.1 SUSE CaaS Platform 3.0 (src): xen-4.9.4_06-3.59.1 HPE Helion Openstack 8 (src): xen-4.9.4_06-3.59.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2020:0334-1: An update that fixes 13 vulnerabilities is now available. Category: security (important) Bug References: 1152497,1154448,1154456,1154458,1154461,1155945,1157888,1158003,1158004,1158005,1158006,1158007,1161181 CVE References: CVE-2018-12207,CVE-2019-11135,CVE-2019-18420,CVE-2019-18421,CVE-2019-18424,CVE-2019-18425,CVE-2019-19577,CVE-2019-19578,CVE-2019-19579,CVE-2019-19580,CVE-2019-19581,CVE-2019-19583,CVE-2020-7211 Sources used: SUSE OpenStack Cloud 7 (src): xen-4.7.6_06-43.59.1 SUSE Linux Enterprise Server for SAP 12-SP2 (src): xen-4.7.6_06-43.59.1 SUSE Linux Enterprise Server 12-SP2-LTSS (src): xen-4.7.6_06-43.59.1 SUSE Linux Enterprise Server 12-SP2-BCL (src): xen-4.7.6_06-43.59.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2020:0388-1: An update that fixes 25 vulnerabilities is now available. Category: security (important) Bug References: 1115045,1126140,1126141,1126192,1126195,1126196,1126201,1135905,1143797,1145652,1146874,1149813,1152497,1154448,1154456,1154458,1154461,1155945,1157888,1158003,1158004,1158005,1158006,1158007,1161181 CVE References: CVE-2018-12207,CVE-2018-19965,CVE-2019-11135,CVE-2019-12067,CVE-2019-12068,CVE-2019-12155,CVE-2019-14378,CVE-2019-15890,CVE-2019-17340,CVE-2019-17341,CVE-2019-17342,CVE-2019-17343,CVE-2019-17344,CVE-2019-17347,CVE-2019-18420,CVE-2019-18421,CVE-2019-18424,CVE-2019-18425,CVE-2019-19577,CVE-2019-19578,CVE-2019-19579,CVE-2019-19580,CVE-2019-19581,CVE-2019-19583,CVE-2020-7211 Sources used: SUSE Linux Enterprise Server for SAP 12-SP1 (src): xen-4.5.5_28-22.64.1 SUSE Linux Enterprise Server 12-SP1-LTSS (src): xen-4.5.5_28-22.64.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2020:14444-1: An update that fixes 16 vulnerabilities is now available. Category: security (important) Bug References: 1152497,1154448,1154456,1154458,1154461,1155945,1157888,1158004,1158005,1158006,1158007,1161181,1163019,1168140,1169392,1174543 CVE References: CVE-2018-12207,CVE-2019-11135,CVE-2019-18420,CVE-2019-18421,CVE-2019-18424,CVE-2019-18425,CVE-2019-19577,CVE-2019-19578,CVE-2019-19579,CVE-2019-19580,CVE-2019-19583,CVE-2020-11740,CVE-2020-11741,CVE-2020-11742,CVE-2020-7211,CVE-2020-8608 JIRA References: Sources used: SUSE Linux Enterprise Server 11-SP4-LTSS (src): xen-4.4.4_42-61.52.1 SUSE Linux Enterprise Debuginfo 11-SP4 (src): xen-4.4.4_42-61.52.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
Backported and released to 11-SP4.
released