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  <DocumentTitle xml:lang="en">Security update for xen</DocumentTitle>
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        <Date>2021-09-03T12:45:10Z</Date>
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    <Note Title="Topic" Type="Summary" Ordinal="1" xml:lang="en">Security update for xen</Note>
    <Note Title="Details" Type="General" Ordinal="2" xml:lang="en">This update for xen fixes the following issues:

Security issues fixed:

- CVE-2021-28698: long running loops in grant table handling (XSA-380)(bsc#1189378).
- CVE-2021-28697: grant table v2 status pages may remain accessible after de-allocation (XSA-379)(bsc#1189376).
- CVE-2021-28694,CVE-2021-28695,CVE-2021-28696: IOMMU page mapping issues on x86 (XSA-378)(bsc#1189373).
- CVE-2021-28699: inadequate grant-v2 status frames array bounds check (XSA-382)(bsc#1189380).
- CVE-2021-28692: xen: inappropriate x86 IOMMU timeout detection / handling (bsc#1186429)
- CVE-2021-28690: xen: x86: TSX Async Abort protections not restored after S3 (bsc#1186434)
- CVE-2021-0089: xen: Speculative Code Store Bypass (bsc#1186433)
- CVE-2021-20255: Fixed stack overflow via infinite recursion in eepro100 (bsc#1182654)
- CVE-2021-3592: slirp: invalid pointer initialization may lead to information disclosure (bootp)(bsc#1187369).
- CVE-2021-3594: slirp: invalid pointer initialization may lead to information disclosure (udp)(bsc#1187378).
- CVE-2021-3595: slirp: invalid pointer initialization may lead to information disclosure (tftp)(bsc#1187376).
- CVE-2021-3308: Fixed IRQ vector leak on x86 (XSA-360)(bsc#1181254).

- Prevent superpage allocation in the LAPIC and ACPI_INFO range (bsc#1189882).
</Note>
    <Note Title="Terms of Use" Type="Legal Disclaimer" Ordinal="3" xml:lang="en">The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).</Note>
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  <DocumentDistribution xml:lang="en">Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0)</DocumentDistribution>
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      <URL>https://lists.suse.com/pipermail/sle-security-updates/2021-September/009406.html</URL>
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      <URL>https://www.suse.com/support/security/rating/</URL>
      <Description>SUSE Security Ratings</Description>
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      <URL>https://bugzilla.suse.com/1181254</URL>
      <Description>SUSE Bug 1181254</Description>
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      <URL>https://bugzilla.suse.com/1182654</URL>
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      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">inappropriate x86 IOMMU timeout detection / handling IOMMUs process commands issued to them in parallel with the operation of the CPU(s) issuing such commands. In the current implementation in Xen, asynchronous notification of the completion of such commands is not used. Instead, the issuing CPU spin-waits for the completion of the most recently issued command(s). Some of these waiting loops try to apply a timeout to fail overly-slow commands. The course of action upon a perceived timeout actually being detected is inappropriate: - on Intel hardware guests which did not originally cause the timeout may be marked as crashed, - on AMD hardware higher layer callers would not be notified of the issue, making them continue as if the IOMMU operation succeeded.</Note>
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    <CVE>CVE-2021-28692</CVE>
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</Description>
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        <Description>CVE-2021-28692</Description>
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      <Reference>
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        <Description>SUSE Bug 1186429</Description>
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    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Both AMD and Intel allow ACPI tables to specify regions of memory which should be left untranslated, which typically means these addresses should pass the translation phase unaltered. While these are typically device specific ACPI properties, they can also be specified to apply to a range of devices, or even all devices. On all systems with such regions Xen failed to prevent guests from undoing/replacing such mappings (CVE-2021-28694). On AMD systems, where a discontinuous range is specified by firmware, the supposedly-excluded middle range will also be identity-mapped (CVE-2021-28695). Further, on AMD systems, upon de-assigment of a physical device from a guest, the identity mappings would be left in place, allowing a guest continued access to ranges of memory which it shouldn't have access to anymore (CVE-2021-28696).</Note>
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</Description>
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        <Description>CVE-2021-28694</Description>
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      <Reference>
        <URL>https://bugzilla.suse.com/1189373</URL>
        <Description>SUSE Bug 1189373</Description>
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        <Description>SUSE Bug 1189980</Description>
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    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Both AMD and Intel allow ACPI tables to specify regions of memory which should be left untranslated, which typically means these addresses should pass the translation phase unaltered. While these are typically device specific ACPI properties, they can also be specified to apply to a range of devices, or even all devices. On all systems with such regions Xen failed to prevent guests from undoing/replacing such mappings (CVE-2021-28694). On AMD systems, where a discontinuous range is specified by firmware, the supposedly-excluded middle range will also be identity-mapped (CVE-2021-28695). Further, on AMD systems, upon de-assigment of a physical device from a guest, the identity mappings would be left in place, allowing a guest continued access to ranges of memory which it shouldn't have access to anymore (CVE-2021-28696).</Note>
    </Notes>
    <CVE>CVE-2021-28695</CVE>
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</Description>
        <URL>https://www.suse.com/support/update/announcement/2021/suse-su-20212955-1/</URL>
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        <Description>CVE-2021-28695</Description>
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        <URL>https://bugzilla.suse.com/1189373</URL>
        <Description>SUSE Bug 1189373</Description>
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      <Reference>
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        <Description>SUSE Bug 1189980</Description>
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    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Both AMD and Intel allow ACPI tables to specify regions of memory which should be left untranslated, which typically means these addresses should pass the translation phase unaltered. While these are typically device specific ACPI properties, they can also be specified to apply to a range of devices, or even all devices. On all systems with such regions Xen failed to prevent guests from undoing/replacing such mappings (CVE-2021-28694). On AMD systems, where a discontinuous range is specified by firmware, the supposedly-excluded middle range will also be identity-mapped (CVE-2021-28695). Further, on AMD systems, upon de-assigment of a physical device from a guest, the identity mappings would be left in place, allowing a guest continued access to ranges of memory which it shouldn't have access to anymore (CVE-2021-28696).</Note>
    </Notes>
    <CVE>CVE-2021-28696</CVE>
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        <Description xml:lang="en">To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
</Description>
        <URL>https://www.suse.com/support/update/announcement/2021/suse-su-20212955-1/</URL>
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    <References>
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        <Description>CVE-2021-28696</Description>
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        <URL>https://bugzilla.suse.com/1189373</URL>
        <Description>SUSE Bug 1189373</Description>
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        <Description>SUSE Bug 1189980</Description>
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  <vuln:Vulnerability xmlns="http://docs.oasis-open.org/csaf/ns/csaf-cvrf/v1.2/vuln" Ordinal="8">
    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">grant table v2 status pages may remain accessible after de-allocation Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched (back) from v2 to v1. The freeing of such pages requires that the hypervisor know where in the guest these pages were mapped. The hypervisor tracks only one use within guest space, but racing requests from the guest to insert mappings of these pages may result in any of them to become mapped in multiple locations. Upon switching back from v2 to v1, the guest would then retain access to a page that was freed and perhaps re-used for other purposes.</Note>
    </Notes>
    <CVE>CVE-2021-28697</CVE>
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        <Description xml:lang="en">To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
</Description>
        <URL>https://www.suse.com/support/update/announcement/2021/suse-su-20212955-1/</URL>
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    <References>
      <Reference>
        <URL>https://www.suse.com/security/cve/CVE-2021-28697.html</URL>
        <Description>CVE-2021-28697</Description>
      </Reference>
      <Reference>
        <URL>https://bugzilla.suse.com/1189376</URL>
        <Description>SUSE Bug 1189376</Description>
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  <vuln:Vulnerability xmlns="http://docs.oasis-open.org/csaf/ns/csaf-cvrf/v1.2/vuln" Ordinal="9">
    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">long running loops in grant table handling In order to properly monitor resource use, Xen maintains information on the grant mappings a domain may create to map grants offered by other domains. In the process of carrying out certain actions, Xen would iterate over all such entries, including ones which aren't in use anymore and some which may have been created but never used. If the number of entries for a given domain is large enough, this iterating of the entire table may tie up a CPU for too long, starving other domains or causing issues in the hypervisor itself. Note that a domain may map its own grants, i.e. there is no need for multiple domains to be involved here. A pair of "cooperating" guests may, however, cause the effects to be more severe.</Note>
    </Notes>
    <CVE>CVE-2021-28698</CVE>
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        <VectorV3>CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H</VectorV3>
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        <Description xml:lang="en">To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
</Description>
        <URL>https://www.suse.com/support/update/announcement/2021/suse-su-20212955-1/</URL>
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    <References>
      <Reference>
        <URL>https://www.suse.com/security/cve/CVE-2021-28698.html</URL>
        <Description>CVE-2021-28698</Description>
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      <Reference>
        <URL>https://bugzilla.suse.com/1189378</URL>
        <Description>SUSE Bug 1189378</Description>
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  <vuln:Vulnerability xmlns="http://docs.oasis-open.org/csaf/ns/csaf-cvrf/v1.2/vuln" Ordinal="10">
    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">inadequate grant-v2 status frames array bounds check The v2 grant table interface separates grant attributes from grant status. That is, when operating in this mode, a guest has two tables. As a result, guests also need to be able to retrieve the addresses that the new status tracking table can be accessed through. For 32-bit guests on x86, translation of requests has to occur because the interface structure layouts commonly differ between 32- and 64-bit. The translation of the request to obtain the frame numbers of the grant status table involves translating the resulting array of frame numbers. Since the space used to carry out the translation is limited, the translation layer tells the core function the capacity of the array within translation space. Unfortunately the core function then only enforces array bounds to be below 8 times the specified value, and would write past the available space if enough frame numbers needed storing.</Note>
    </Notes>
    <CVE>CVE-2021-28699</CVE>
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        <BaseScoreV3>7</BaseScoreV3>
        <VectorV3>CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H</VectorV3>
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    <Remediations>
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        <Description xml:lang="en">To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
</Description>
        <URL>https://www.suse.com/support/update/announcement/2021/suse-su-20212955-1/</URL>
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    <References>
      <Reference>
        <URL>https://www.suse.com/security/cve/CVE-2021-28699.html</URL>
        <Description>CVE-2021-28699</Description>
      </Reference>
      <Reference>
        <URL>https://bugzilla.suse.com/1189380</URL>
        <Description>SUSE Bug 1189380</Description>
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        <URL>https://bugzilla.suse.com/1194306</URL>
        <Description>SUSE Bug 1194306</Description>
      </Reference>
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  <vuln:Vulnerability xmlns="http://docs.oasis-open.org/csaf/ns/csaf-cvrf/v1.2/vuln" Ordinal="11">
    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">An issue was discovered in Xen 4.12.3 through 4.12.4 and 4.13.1 through 4.14.x. An x86 HVM guest with PCI pass through devices can force the allocation of all IDT vectors on the system by rebooting itself with MSI or MSI-X capabilities enabled and entries setup. Such reboots will leak any vectors used by the MSI(-X) entries that the guest might had enabled, and hence will lead to vector exhaustion on the system, not allowing further PCI pass through devices to work properly. HVM guests with PCI pass through devices can mount a Denial of Service (DoS) attack affecting the pass through of PCI devices to other guests or the hardware domain. In the latter case, this would affect the entire host.</Note>
    </Notes>
    <CVE>CVE-2021-3308</CVE>
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        <BaseScoreV2>4.9</BaseScoreV2>
        <VectorV2>AV:L/AC:L/Au:N/C:N/I:N/A:C</VectorV2>
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    <Remediations>
      <Remediation Type="Vendor Fix">
        <Description xml:lang="en">To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
</Description>
        <URL>https://www.suse.com/support/update/announcement/2021/suse-su-20212955-1/</URL>
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    <References>
      <Reference>
        <URL>https://www.suse.com/security/cve/CVE-2021-3308.html</URL>
        <Description>CVE-2021-3308</Description>
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      <Reference>
        <URL>https://bugzilla.suse.com/1181254</URL>
        <Description>SUSE Bug 1181254</Description>
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  <vuln:Vulnerability xmlns="http://docs.oasis-open.org/csaf/ns/csaf-cvrf/v1.2/vuln" Ordinal="12">
    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the bootp_input() function and could occur while processing a udp packet that is smaller than the size of the 'bootp_t' structure. A malicious guest could use this flaw to leak 10 bytes of uninitialized heap memory from the host. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.</Note>
    </Notes>
    <CVE>CVE-2021-3592</CVE>
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</Description>
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        <Description>CVE-2021-3592</Description>
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      <Reference>
        <URL>https://bugzilla.suse.com/1187364</URL>
        <Description>SUSE Bug 1187364</Description>
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        <Description>SUSE Bug 1187369</Description>
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      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp_input() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.</Note>
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        <Description>CVE-2021-3594</Description>
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        <URL>https://bugzilla.suse.com/1187367</URL>
        <Description>SUSE Bug 1187367</Description>
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    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the tftp_input() function and could occur while processing a udp packet that is smaller than the size of the 'tftp_t' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.</Note>
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    <CVE>CVE-2021-3595</CVE>
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        <Description>CVE-2021-3595</Description>
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        <URL>https://bugzilla.suse.com/1187366</URL>
        <Description>SUSE Bug 1187366</Description>
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        <URL>https://bugzilla.suse.com/1187376</URL>
        <Description>SUSE Bug 1187376</Description>
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</cvrfdoc>
