Vulnerability from csaf_suse
Published
2020-04-28 05:49
Modified
2020-04-28 05:49
Summary
Security update for xen

Notes

Title of the patch
Security update for xen
Description of the patch
This update for xen fixes the following issues: Security issues fixed: - CVE-2020-11742: Bad continuation handling in GNTTABOP_copy (bsc#1169392). - CVE-2020-11740, CVE-2020-11741: xen: XSA-313 multiple xenoprof issues (bsc#1168140). - CVE-2020-11739: Missing memory barriers in read-write unlock paths (bsc#1168142). - CVE-2020-11743: Bad error path in GNTTABOP_map_grant (bsc#1168143). - arm: a CPU may speculate past the ERET instruction (bsc#1160932). Non-security issues fixed: - Xenstored Crashed during VM install (bsc#1167152) - DomU hang: soft lockup CPU #0 stuck under high load (bsc#1165206, bsc#1134506) - Update API compatibility versions, fixes issues for libvirt. (bsc#1167007, bsc#1157490) - aacraid blocks xen commands (bsc#1155200)
Patchnames
SUSE-2020-1124,SUSE-SLE-Module-Basesystem-15-SP1-2020-1124,SUSE-SLE-Module-Development-Tools-OBS-15-SP1-2020-1124,SUSE-SLE-Module-Server-Applications-15-SP1-2020-1124
Terms of use
CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).


To clipboard 

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            text: "This update for xen fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2020-11742: Bad continuation handling in GNTTABOP_copy (bsc#1169392).\n- CVE-2020-11740, CVE-2020-11741: xen: XSA-313 multiple xenoprof issues (bsc#1168140).\n- CVE-2020-11739: Missing memory barriers in read-write unlock paths (bsc#1168142).\n- CVE-2020-11743: Bad error path in GNTTABOP_map_grant (bsc#1168143).\n- arm: a CPU may speculate past the ERET instruction (bsc#1160932).\n\nNon-security issues fixed:\n\n- Xenstored Crashed during VM install (bsc#1167152)\n- DomU hang: soft lockup CPU #0 stuck under high load (bsc#1165206, bsc#1134506)\n- Update API compatibility versions, fixes issues for libvirt. (bsc#1167007, bsc#1157490)\n- aacraid blocks xen commands (bsc#1155200)\n",
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               text: "https://www.suse.com/security/cve/CVE-2020-11739",
            },
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         notes: [
            {
               category: "general",
               text: "An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service or possibly gain privileges because of missing memory barriers in read-write unlock paths. The read-write unlock paths don't contain a memory barrier. On Arm, this means a processor is allowed to re-order the memory access with the preceding ones. In other words, the unlock may be seen by another processor before all the memory accesses within the \"critical\" section. As a consequence, it may be possible to have a writer executing a critical section at the same time as readers or another writer. In other words, many of the assumptions (e.g., a variable cannot be modified after a check) in the critical sections are not safe anymore. The read-write locks are used in hypercalls (such as grant-table ones), so a malicious guest could exploit the race. For instance, there is a small window where Xen can leak memory if XENMAPSPACE_grant_table is used concurrently. A malicious guest may be able to leak memory, or cause a hypervisor crash resulting in a Denial of Service (DoS). Information leak and privilege escalation cannot be excluded.",
               title: "CVE description",
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         ],
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            {
               category: "vendor_fix",
               details: "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
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         scores: [
            {
               cvss_v3: {
                  baseScore: 7.8,
                  baseSeverity: "HIGH",
                  vectorString: "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
                  version: "3.1",
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         threats: [
            {
               category: "impact",
               date: "2020-04-28T05:49:29Z",
               details: "important",
            },
         ],
         title: "CVE-2020-11739",
      },
      {
         cve: "CVE-2020-11740",
         ids: [
            {
               system_name: "SUSE CVE Page",
               text: "https://www.suse.com/security/cve/CVE-2020-11740",
            },
         ],
         notes: [
            {
               category: "general",
               text: "An issue was discovered in xenoprof in Xen through 4.13.x, allowing guest OS users (without active profiling) to obtain sensitive information about other guests. Unprivileged guests can request to map xenoprof buffers, even if profiling has not been enabled for those guests. These buffers were not scrubbed.",
               title: "CVE description",
            },
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            {
               category: "vendor_fix",
               details: "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
               product_ids: [
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-libs-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-tools-domU-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-devel-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-tools-4.12.2_04-3.15.1.x86_64",
               ],
            },
         ],
         scores: [
            {
               cvss_v3: {
                  baseScore: 5.5,
                  baseSeverity: "MEDIUM",
                  vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  version: "3.1",
               },
               products: [
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-libs-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-tools-domU-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-devel-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-tools-4.12.2_04-3.15.1.x86_64",
               ],
            },
         ],
         threats: [
            {
               category: "impact",
               date: "2020-04-28T05:49:29Z",
               details: "important",
            },
         ],
         title: "CVE-2020-11740",
      },
      {
         cve: "CVE-2020-11741",
         ids: [
            {
               system_name: "SUSE CVE Page",
               text: "https://www.suse.com/security/cve/CVE-2020-11741",
            },
         ],
         notes: [
            {
               category: "general",
               text: "An issue was discovered in xenoprof in Xen through 4.13.x, allowing guest OS users (with active profiling) to obtain sensitive information about other guests, cause a denial of service, or possibly gain privileges. For guests for which \"active\" profiling was enabled by the administrator, the xenoprof code uses the standard Xen shared ring structure. Unfortunately, this code did not treat the guest as a potential adversary: it trusts the guest not to modify buffer size information or modify head / tail pointers in unexpected ways. This can crash the host (DoS). Privilege escalation cannot be ruled out.",
               title: "CVE description",
            },
         ],
         product_status: {
            recommended: [
               "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-libs-4.12.2_04-3.15.1.x86_64",
               "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-tools-domU-4.12.2_04-3.15.1.x86_64",
               "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-4.12.2_04-3.15.1.x86_64",
               "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-devel-4.12.2_04-3.15.1.x86_64",
               "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-tools-4.12.2_04-3.15.1.x86_64",
            ],
         },
         references: [
            {
               category: "external",
               summary: "CVE-2020-11741",
               url: "https://www.suse.com/security/cve/CVE-2020-11741",
            },
            {
               category: "external",
               summary: "SUSE Bug 1168140 for CVE-2020-11741",
               url: "https://bugzilla.suse.com/1168140",
            },
            {
               category: "external",
               summary: "SUSE Bug 1178658 for CVE-2020-11741",
               url: "https://bugzilla.suse.com/1178658",
            },
         ],
         remediations: [
            {
               category: "vendor_fix",
               details: "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
               product_ids: [
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-libs-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-tools-domU-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-devel-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-tools-4.12.2_04-3.15.1.x86_64",
               ],
            },
         ],
         scores: [
            {
               cvss_v3: {
                  baseScore: 8.8,
                  baseSeverity: "HIGH",
                  vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                  version: "3.1",
               },
               products: [
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-libs-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-tools-domU-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-devel-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-tools-4.12.2_04-3.15.1.x86_64",
               ],
            },
         ],
         threats: [
            {
               category: "impact",
               date: "2020-04-28T05:49:29Z",
               details: "important",
            },
         ],
         title: "CVE-2020-11741",
      },
      {
         cve: "CVE-2020-11742",
         ids: [
            {
               system_name: "SUSE CVE Page",
               text: "https://www.suse.com/security/cve/CVE-2020-11742",
            },
         ],
         notes: [
            {
               category: "general",
               text: "An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of bad continuation handling in GNTTABOP_copy. Grant table operations are expected to return 0 for success, and a negative number for errors. The fix for CVE-2017-12135 introduced a path through grant copy handling where success may be returned to the caller without any action taken. In particular, the status fields of individual operations are left uninitialised, and may result in errant behaviour in the caller of GNTTABOP_copy. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to copy a grant, it hits the incorrect exit path. This returns success to the caller without doing anything, which may cause crashes or other incorrect behaviour.",
               title: "CVE description",
            },
         ],
         product_status: {
            recommended: [
               "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-libs-4.12.2_04-3.15.1.x86_64",
               "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-tools-domU-4.12.2_04-3.15.1.x86_64",
               "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-4.12.2_04-3.15.1.x86_64",
               "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-devel-4.12.2_04-3.15.1.x86_64",
               "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-tools-4.12.2_04-3.15.1.x86_64",
            ],
         },
         references: [
            {
               category: "external",
               summary: "CVE-2020-11742",
               url: "https://www.suse.com/security/cve/CVE-2020-11742",
            },
            {
               category: "external",
               summary: "SUSE Bug 1169392 for CVE-2020-11742",
               url: "https://bugzilla.suse.com/1169392",
            },
            {
               category: "external",
               summary: "SUSE Bug 1178658 for CVE-2020-11742",
               url: "https://bugzilla.suse.com/1178658",
            },
         ],
         remediations: [
            {
               category: "vendor_fix",
               details: "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
               product_ids: [
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-libs-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-tools-domU-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-devel-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-tools-4.12.2_04-3.15.1.x86_64",
               ],
            },
         ],
         scores: [
            {
               cvss_v3: {
                  baseScore: 4.3,
                  baseSeverity: "MEDIUM",
                  vectorString: "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
                  version: "3.1",
               },
               products: [
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-libs-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-tools-domU-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-devel-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-tools-4.12.2_04-3.15.1.x86_64",
               ],
            },
         ],
         threats: [
            {
               category: "impact",
               date: "2020-04-28T05:49:29Z",
               details: "moderate",
            },
         ],
         title: "CVE-2020-11742",
      },
      {
         cve: "CVE-2020-11743",
         ids: [
            {
               system_name: "SUSE CVE Page",
               text: "https://www.suse.com/security/cve/CVE-2020-11743",
            },
         ],
         notes: [
            {
               category: "general",
               text: "An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain.",
               title: "CVE description",
            },
         ],
         product_status: {
            recommended: [
               "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-libs-4.12.2_04-3.15.1.x86_64",
               "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-tools-domU-4.12.2_04-3.15.1.x86_64",
               "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-4.12.2_04-3.15.1.x86_64",
               "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-devel-4.12.2_04-3.15.1.x86_64",
               "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-tools-4.12.2_04-3.15.1.x86_64",
            ],
         },
         references: [
            {
               category: "external",
               summary: "CVE-2020-11743",
               url: "https://www.suse.com/security/cve/CVE-2020-11743",
            },
            {
               category: "external",
               summary: "SUSE Bug 1168143 for CVE-2020-11743",
               url: "https://bugzilla.suse.com/1168143",
            },
         ],
         remediations: [
            {
               category: "vendor_fix",
               details: "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
               product_ids: [
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-libs-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-tools-domU-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-devel-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-tools-4.12.2_04-3.15.1.x86_64",
               ],
            },
         ],
         scores: [
            {
               cvss_v3: {
                  baseScore: 5.5,
                  baseSeverity: "MEDIUM",
                  vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  version: "3.1",
               },
               products: [
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-libs-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Basesystem 15 SP1:xen-tools-domU-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-devel-4.12.2_04-3.15.1.x86_64",
                  "SUSE Linux Enterprise Module for Server Applications 15 SP1:xen-tools-4.12.2_04-3.15.1.x86_64",
               ],
            },
         ],
         threats: [
            {
               category: "impact",
               date: "2020-04-28T05:49:29Z",
               details: "moderate",
            },
         ],
         title: "CVE-2020-11743",
      },
   ],
}


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This schema specifies the format of a comment related to a security advisory.

UUIDv4 of the comment
UUIDv4 of the Vulnerability-Lookup instance
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The identifier of the vulnerability (CVE ID, GHSA-ID, PYSEC ID, etc.).



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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