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  <DocumentTitle xml:lang="en">Security update for xen</DocumentTitle>
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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">xen was updated to version 4.7.1 to fix 17 security issues.

These security issues were fixed:

- CVE-2016-9637: ioport array overflow allowing a malicious guest administrator can escalate their privilege to that of the host (bsc#1011652).
- CVE-2016-9386: x86 null segments were not always treated as unusable allowing an unprivileged guest user program to elevate its privilege to that of the guest operating system. Exploit of this vulnerability is easy on Intel and more complicated on AMD (bsc#1009100).
- CVE-2016-9382: x86 task switch to VM86 mode was mis-handled, allowing a unprivileged guest process to escalate its privilege to that of the guest operating system on AMD hardware. On Intel hardware a malicious unprivileged guest process can crash the guest (bsc#1009103).
- CVE-2016-9385: x86 segment base write emulation lacked canonical address checks, allowing a malicious guest administrator to crash the host (bsc#1009104).
- CVE-2016-9384: Guest 32-bit ELF symbol table load leaking host data to unprivileged guest users (bsc#1009105).
- CVE-2016-9383: The x86 64-bit bit test instruction emulation was broken, allowing a guest to modify arbitrary memory leading to arbitray code execution (bsc#1009107).
- CVE-2016-9377: x86 software interrupt injection was mis-handled, allowing an unprivileged guest user to crash the guest (bsc#1009108).
- CVE-2016-9378: x86 software interrupt injection was mis-handled, allowing an unprivileged guest user to crash the guest (bsc#1009108)
- CVE-2016-9381: Improper processing of shared rings allowing guest administrators take over the qemu process, elevating their privilege to that of the qemu process (bsc#1009109).
- CVE-2016-9379: Delimiter injection vulnerabilities in pygrub allowed guest administrators to obtain the contents of sensitive host files or delete the files (bsc#1009111).
- CVE-2016-9380: Delimiter injection vulnerabilities in pygrub allowed  guest administrators to obtain the contents of sensitive host files or delete the files  (bsc#1009111).
- CVE-2016-7777: Xen did not properly honor CR0.TS and CR0.EM, which allowed local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it (bsc#1000106).
- CVE-2016-8910: The rtl8139_cplus_transmit function in hw/net/rtl8139.c allowed local guest OS administrators to cause a denial of service (infinite loop and CPU consumption) by leveraging failure to limit the ring descriptor count (bsc#1007157).
- CVE-2016-8667: The rc4030_write function in hw/dma/rc4030.c in allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via a large interval timer reload value (bsc#1005004).
- CVE-2016-8669: The serial_update_parameters function in hw/char/serial.c allowed local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via vectors involving a value of divider greater than baud base (bsc#1005005).
- CVE-2016-7908: The mcf_fec_do_tx function in hw/net/mcf_fec.c did not properly limit the buffer descriptor count when transmitting packets, which allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) via vectors involving a buffer descriptor with a length of 0 and crafted values in bd.flags (bsc#1003030).
- CVE-2016-7909: The pcnet_rdra_addr function in hw/net/pcnet.c allowed local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) by setting the (1) receive or (2) transmit descriptor ring length to 0 (bsc#1003032).

These non-security issues were fixed:

- bsc#1004981: Xen RPM didn't contain debug hypervisor for EFI systems
- bsc#1007941: Xen tools limited the number of vcpus to 256 

This update was imported from the SUSE:SLE-12-SP2:Update update project.</Note>
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        <BaseScoreV3>6</BaseScoreV3>
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      <Remediation Type="Vendor Fix">
        <Description xml:lang="en">Please Install the update.</Description>
        <URL>https://lists.opensuse.org/opensuse-security-announce/2016-12/msg00060.html</URL>
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    <References>
      <Reference>
        <URL>https://www.suse.com/security/cve/CVE-2016-8669.html</URL>
        <Description>CVE-2016-8669</Description>
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      <Reference>
        <URL>https://bugzilla.suse.com/1004707</URL>
        <Description>SUSE Bug 1004707</Description>
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      <Reference>
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        <Description>SUSE Bug 1005005</Description>
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    <Notes>
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    <CVE>CVE-2016-8910</CVE>
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      <Remediation Type="Vendor Fix">
        <Description xml:lang="en">Please Install the update.</Description>
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      <Reference>
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        <Description>SUSE Bug 1006538</Description>
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        <Description>SUSE Bug 1007157</Description>
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      <Reference>
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        <Description>SUSE Bug 1024178</Description>
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      <Remediation Type="Vendor Fix">
        <Description xml:lang="en">Please Install the update.</Description>
        <URL>https://lists.opensuse.org/opensuse-security-announce/2016-12/msg00060.html</URL>
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      <Reference>
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        <Description>CVE-2016-9377</Description>
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      <Reference>
        <URL>https://bugzilla.suse.com/1009108</URL>
        <Description>SUSE Bug 1009108</Description>
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  <vuln:Vulnerability xmlns="http://docs.oasis-open.org/csaf/ns/csaf-cvrf/v1.2/vuln" Ordinal="8">
    <Notes>
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      <Remediation Type="Vendor Fix">
        <Description xml:lang="en">Please Install the update.</Description>
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    <References>
      <Reference>
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        <Description>CVE-2016-9378</Description>
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      <Reference>
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        <Description>SUSE Bug 1009108</Description>
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    <Notes>
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    <CVE>CVE-2016-9379</CVE>
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        <BaseScoreV2>6.6</BaseScoreV2>
        <VectorV2>AV:L/AC:M/Au:S/C:C/I:C/A:C</VectorV2>
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      <ScoreSetV3>
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        <VectorV3>CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N</VectorV3>
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    <Remediations>
      <Remediation Type="Vendor Fix">
        <Description xml:lang="en">Please Install the update.</Description>
        <URL>https://lists.opensuse.org/opensuse-security-announce/2016-12/msg00060.html</URL>
      </Remediation>
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    <References>
      <Reference>
        <URL>https://www.suse.com/security/cve/CVE-2016-9379.html</URL>
        <Description>CVE-2016-9379</Description>
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      <Reference>
        <URL>https://bugzilla.suse.com/1009111</URL>
        <Description>SUSE Bug 1009111</Description>
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    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">The pygrub boot loader emulator in Xen, when nul-delimited output format is requested, allows local pygrub-using guest OS administrators to read or delete arbitrary files on the host via NUL bytes in the bootloader configuration file.</Note>
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    <CVE>CVE-2016-9380</CVE>
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        <VectorV2>AV:L/AC:M/Au:S/C:C/I:C/A:C</VectorV2>
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      <Remediation Type="Vendor Fix">
        <Description xml:lang="en">Please Install the update.</Description>
        <URL>https://lists.opensuse.org/opensuse-security-announce/2016-12/msg00060.html</URL>
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    <References>
      <Reference>
        <URL>https://www.suse.com/security/cve/CVE-2016-9380.html</URL>
        <Description>CVE-2016-9380</Description>
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        <Description>SUSE Bug 1009111</Description>
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    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">Race condition in QEMU in Xen allows local x86 HVM guest OS administrators to gain privileges by changing certain data on shared rings, aka a "double fetch" vulnerability.</Note>
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    <CVE>CVE-2016-9381</CVE>
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        <VectorV2>AV:L/AC:H/Au:S/C:C/I:C/A:C</VectorV2>
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      <Remediation Type="Vendor Fix">
        <Description xml:lang="en">Please Install the update.</Description>
        <URL>https://lists.opensuse.org/opensuse-security-announce/2016-12/msg00060.html</URL>
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    <Notes>
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        <Description>CVE-2016-9382</Description>
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        <Description>SUSE Bug 1009103</Description>
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    <Notes>
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        <Description>SUSE Bug 1009107</Description>
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    <Notes>
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        <VectorV2>AV:L/AC:H/Au:S/C:P/I:N/A:N</VectorV2>
      </ScoreSetV2>
      <ScoreSetV3>
        <BaseScoreV3>6.5</BaseScoreV3>
        <VectorV3>CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N</VectorV3>
      </ScoreSetV3>
    </CVSSScoreSets>
    <Remediations>
      <Remediation Type="Vendor Fix">
        <Description xml:lang="en">Please Install the update.</Description>
        <URL>https://lists.opensuse.org/opensuse-security-announce/2016-12/msg00060.html</URL>
      </Remediation>
    </Remediations>
    <References>
      <Reference>
        <URL>https://www.suse.com/security/cve/CVE-2016-9384.html</URL>
        <Description>CVE-2016-9384</Description>
      </Reference>
      <Reference>
        <URL>https://bugzilla.suse.com/1009105</URL>
        <Description>SUSE Bug 1009105</Description>
      </Reference>
    </References>
  </vuln:Vulnerability>
  <vuln:Vulnerability xmlns="http://docs.oasis-open.org/csaf/ns/csaf-cvrf/v1.2/vuln" Ordinal="15">
    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">The x86 segment base write emulation functionality in Xen 4.4.x through 4.7.x allows local x86 PV guest OS administrators to cause a denial of service (host crash) by leveraging lack of canonical address checks.</Note>
    </Notes>
    <CVE>CVE-2016-9385</CVE>
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    </ProductStatuses>
    <Threats>
      <Threat Type="Impact">
        <Description>moderate</Description>
      </Threat>
    </Threats>
    <CVSSScoreSets>
      <ScoreSetV2>
        <BaseScoreV2>4.4</BaseScoreV2>
        <VectorV2>AV:L/AC:M/Au:S/C:N/I:N/A:C</VectorV2>
      </ScoreSetV2>
      <ScoreSetV3>
        <BaseScoreV3>6</BaseScoreV3>
        <VectorV3>CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H</VectorV3>
      </ScoreSetV3>
    </CVSSScoreSets>
    <Remediations>
      <Remediation Type="Vendor Fix">
        <Description xml:lang="en">Please Install the update.</Description>
        <URL>https://lists.opensuse.org/opensuse-security-announce/2016-12/msg00060.html</URL>
      </Remediation>
    </Remediations>
    <References>
      <Reference>
        <URL>https://www.suse.com/security/cve/CVE-2016-9385.html</URL>
        <Description>CVE-2016-9385</Description>
      </Reference>
      <Reference>
        <URL>https://bugzilla.suse.com/1009104</URL>
        <Description>SUSE Bug 1009104</Description>
      </Reference>
    </References>
  </vuln:Vulnerability>
  <vuln:Vulnerability xmlns="http://docs.oasis-open.org/csaf/ns/csaf-cvrf/v1.2/vuln" Ordinal="16">
    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">The x86 emulator in Xen does not properly treat x86 NULL segments as unusable when accessing memory, which might allow local HVM guest users to gain privileges via vectors involving "unexpected" base/limit values.</Note>
    </Notes>
    <CVE>CVE-2016-9386</CVE>
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    </ProductStatuses>
    <Threats>
      <Threat Type="Impact">
        <Description>moderate</Description>
      </Threat>
    </Threats>
    <CVSSScoreSets>
      <ScoreSetV2>
        <BaseScoreV2>6.6</BaseScoreV2>
        <VectorV2>AV:L/AC:M/Au:S/C:C/I:C/A:C</VectorV2>
      </ScoreSetV2>
      <ScoreSetV3>
        <BaseScoreV3>7.8</BaseScoreV3>
        <VectorV3>CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H</VectorV3>
      </ScoreSetV3>
    </CVSSScoreSets>
    <Remediations>
      <Remediation Type="Vendor Fix">
        <Description xml:lang="en">Please Install the update.</Description>
        <URL>https://lists.opensuse.org/opensuse-security-announce/2016-12/msg00060.html</URL>
      </Remediation>
    </Remediations>
    <References>
      <Reference>
        <URL>https://www.suse.com/security/cve/CVE-2016-9386.html</URL>
        <Description>CVE-2016-9386</Description>
      </Reference>
      <Reference>
        <URL>https://bugzilla.suse.com/1009100</URL>
        <Description>SUSE Bug 1009100</Description>
      </Reference>
    </References>
  </vuln:Vulnerability>
  <vuln:Vulnerability xmlns="http://docs.oasis-open.org/csaf/ns/csaf-cvrf/v1.2/vuln" Ordinal="17">
    <Notes>
      <Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">The (1) ioport_read and (2) ioport_write functions in Xen, when qemu is used as a device model within Xen, might allow local x86 HVM guest OS administrators to gain qemu process privileges via vectors involving an out-of-range ioport access.</Note>
    </Notes>
    <CVE>CVE-2016-9637</CVE>
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    </ProductStatuses>
    <Threats>
      <Threat Type="Impact">
        <Description>moderate</Description>
      </Threat>
    </Threats>
    <CVSSScoreSets>
      <ScoreSetV2>
        <BaseScoreV2>6.5</BaseScoreV2>
        <VectorV2>AV:A/AC:H/Au:S/C:C/I:C/A:C</VectorV2>
      </ScoreSetV2>
      <ScoreSetV3>
        <BaseScoreV3>7.5</BaseScoreV3>
        <VectorV3>CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H</VectorV3>
      </ScoreSetV3>
    </CVSSScoreSets>
    <Remediations>
      <Remediation Type="Vendor Fix">
        <Description xml:lang="en">Please Install the update.</Description>
        <URL>https://lists.opensuse.org/opensuse-security-announce/2016-12/msg00060.html</URL>
      </Remediation>
    </Remediations>
    <References>
      <Reference>
        <URL>https://www.suse.com/security/cve/CVE-2016-9637.html</URL>
        <Description>CVE-2016-9637</Description>
      </Reference>
      <Reference>
        <URL>https://bugzilla.suse.com/1011652</URL>
        <Description>SUSE Bug 1011652</Description>
      </Reference>
    </References>
  </vuln:Vulnerability>
</cvrfdoc>
