Vulnerabilities > CVE-2017-17045 - Use After Free vulnerability in XEN

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(104899);
  script_version("1.5");
  script_cvs_date("Date: 2019/11/12");

  script_cve_id("CVE-2017-17045");
  script_xref(name:"IAVB", value:"2017-B-0165");

  script_name(english:"Xen Hypervisor Guest-to-Host Privilege Escalation (XSA-247)");
  script_summary(english:"Checks 'xl info' output for the Xen hypervisor version.");

  script_set_attribute(attribute:"synopsis", value:
"The remote Xen hypervisor installation is missing a security update.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version number, the Xen hypervisor
installed on the remote host is affected by a guest-to-host privilege
escalation vulnerability.

This issue only affects HVM guests.

Note that Nessus has checked the changeset versions based on the
xen.git change log. Nessus did not check guest hardware configurations
or if patches were applied manually to the source code before a
recompile and reinstall.");
  script_set_attribute(attribute:"see_also", value:"http://xenbits.xen.org/xsa/advisory-247.html");
  script_set_attribute(attribute:"see_also", value:"https://xenbits.xen.org/gitweb/?p=xen.git;a=summary");
  script_set_attribute(attribute:"solution", value:
"Apply the appropriate patch according to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-17045");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/11/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/11/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/11/30");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:xen:xen");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("xen_server_detect.nbin");
  script_require_keys("installed_sw/Xen Hypervisor", "Settings/ParanoidReport");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("install_func.inc");
include("misc_func.inc");

app_name = "Xen Hypervisor";
install  = get_single_install(app_name:app_name);
if (report_paranoia < 2) audit(AUDIT_PARANOID);

version         = install['version'];
display_version = install['display_version'];
path            = install['path'];
managed_status  = install['Managed status'];
changeset       = install['Changeset'];

if (!empty_or_null(changeset))
  display_version += " (changeset " + changeset + ")";

# Installations that are vendor-managed are handled by OS-specific local package checks
if (managed_status == "managed")
  audit(AUDIT_INST_PATH_NOT_VULN, app_name, display_version, path);

# XSA-247
fixes['4.5']['fixed_ver']           = '4.5.5';
fixes['4.5']['fixed_ver_display']   = '4.5.5 (changeset ea1620f)';
fixes['4.5']['affected_ver_regex']  = '^4\\.5\\.';
fixes['4.5']['affected_changesets'] = make_list("ca708d3", "d144bda",
  "41f6dd0", "b0be3c2", "42ea1dc", "08aa260", "03b06d3", "77666b6",
  "bbeb763", "5fdf16f", "0e9967d", "da4f24d", "b7582ac", "196371c",
  "7afc8ad", "72c107b", "5659aa5", "a224de6", "6442fa9", "db487a6",
  "709230f", "83724d9", "04b8c4c", "0b2ceae", "e3f0768", "d5a5231",
  "c5b0fe5", "136ff4e", "42c8ba5", "d38489d", "df59014", "3217129",
  "4964e86", "c079597", "6ec173b", "a373456", "0780e81", "e5ef76d",
  "25eaa86", "ae02360", "5597df9", "c5de05e", "773094e", "e39a248",
  "7b3712a", "be35327", "8825df1", "d7e3725", "6eb61e4", "b1fcfed",
  "5779d6a", "afdd77e", "c18367a", "7b7fd80", "b30e165", "62ef9b2",
  "8071724", "235b5d5", "a28b99d", "ff294fc", "bc01e2d", "da50922",
  "386cc94", "139960f", "ec3ddd6", "988929a", "1c48dff", "20d4248",
  "9610422", "cd76cd3", "455fd66", "b820c31", "ac3d8bc", "cde86fc",
  "1678521", "83cb2db", "43d06ef", "2b17bf4", "1a2bda5", "0bd7faf",
  "e3426e2", "37281bc", "27be856", "bdf3ef1", "cc325c0", "8e7b84d",
  "387b8ae", "34fbae7", "1530da2", "274a1f6", "b679cfa", "877b760",
  "cfe165d", "84e4e56", "e4ae4b0");

fixes['4.7']['fixed_ver']           = '4.7.5';
fixes['4.7']['fixed_ver_display']   = '4.7.5-pre (changeset b3981ea)';
fixes['4.7']['affected_ver_regex']  = '^4\\.7\\.';
fixes['4.7']['affected_changesets'] = make_list("184f259", "67966a9",
  "af3f585");

fixes['4.9']['fixed_ver']           = '4.9.2';
fixes['4.9']['fixed_ver_display']   = '4.9.2-pre (changeset 0a0dcdc)';
fixes['4.9']['affected_ver_regex']  = '^4\\.9\\.';
fixes['4.9']['affected_changesets'] = make_list("fb51cab", "61c13ed",
  "52ad651");

fix = NULL;
foreach ver_branch (keys(fixes))
{
  if (version =~ fixes[ver_branch]['affected_ver_regex'])
  {
    ret = ver_compare(ver:version, fix:fixes[ver_branch]['fixed_ver']);
    if (ret < 0)
      fix = fixes[ver_branch]['fixed_ver_display'];
    else if (ret == 0)
    {
      if (empty_or_null(changeset))
        fix = fixes[ver_branch]['fixed_ver_display'];
      else
        foreach affected_changeset (fixes[ver_branch]['affected_changesets'])
          if (changeset == affected_changeset)
            fix = fixes[ver_branch]['fixed_ver_display'];

    }

  }

}

if (empty_or_null(fix))
  audit(AUDIT_INST_PATH_NOT_VULN, app_name, display_version, path);

items  = make_array("Installed version", display_version,
                    "Fixed version", fix,
                    "Path", path);
order  = make_list("Path", "Installed version", "Fixed version");
report = report_items_str(report_items:items, ordered_fields:order) + '\n';

security_report_v4(port:0, extra:report, severity:SECURITY_HOLE);

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(105083);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/04/30");

  script_cve_id(
    "CVE-2017-7980",
    "CVE-2017-15592",
    "CVE-2017-17044",
    "CVE-2017-17045"
  );
  script_bugtraq_id(
    97955,
    101513,
    102008,
    102013
  );

  script_name(english:"Citrix XenServer Multiple Vulnerabilities (CTX230138)");
  script_summary(english:"Checks for patches.");

  script_set_attribute(attribute:"synopsis", value:
"A server virtualization platform installed on the remote host is
affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Citrix XenServer installed on the remote host is
missing a security hotfix. It is, therefore, affected by multiple
vulnerabilities as noted in the CTX230138 advisory.");
  script_set_attribute(attribute:"see_also", value:"https://support.citrix.com/article/CTX230138");
  script_set_attribute(attribute:"solution", value:
"Apply the appropriate hotfix according to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-17045");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/03/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/12/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/12/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:citrix:xenserver");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("citrix_xenserver_version.nbin");
  script_require_keys("Host/XenServer/version", "Host/local_checks_enabled");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");

app_name = "Citrix XenServer";
version = get_kb_item_or_exit("Host/XenServer/version");
get_kb_item_or_exit("Host/local_checks_enabled");
patches = get_kb_item("Host/XenServer/patches");
vuln = FALSE;
fix = '';

if (version =~ "^7\.2($|[^0-9])")
{
  if ("XS72E010" >!< patches) # CTX229541
  {
    fix = "XS72E010";
    vuln = TRUE;
  }
  if ("XS72E012" >!< patches) # CTX230161
  {
    if (empty_or_null(fix))
      fix = "XS72E012";
    else
      fix += " and XS72E012";
    vuln = TRUE;
  }
}
else if (version =~ "^7\.1($|[^0-9])")
{
  # LTSR CU1 CTX229540 & CTX230160, LTSR CTX229545 & CTX230159
  # No patch applied
  if ("XS71ECU" >!< patches && "XS71E018" >!< patches && "XS71E019" >!< patches)
  {
    fix = "XS71ECU1006 and XS71ECU1008, or XS71E018 and XS71E019";
    vuln = TRUE;
  }
  # LTSR CU1 patch applied
  else if ("XS71ECU" >!< patches && ("XS71ECU1006" >< patches || "XS71ECU1008" >< patches))
  {
    if ("XS71ECU1006" >!< patches) # CTX229540
    {
      fix = "XS71ECU1006";
      vuln = TRUE;
    }
    else if ("XS71ECU1008" >!< patches) # CTX230160
    {
      fix = "XS71ECU1008";
      vuln = TRUE;
    }
  }
  # LTSR patch applied
  else if ("XS71E018" >< patches || "XS71E019" >< patches)
  {
    if ("XS71E018" >!< patches) # CTX229545
    {
      fix = "XS71E018";
      vuln = TRUE;
    }
    else if ("XS71E019" >!< patches) # CTX230159
    {
      fix = "XS71E019";
      vuln = TRUE;
    }
  }
}
else if (version =~ "^7\.0($|[^0-9])")
{
  if ("XS70E048" >!< patches) # CTX229539
  {
    fix = "XS70E048";
    vuln = TRUE;
  }
  if ("XS70E049" >!< patches) # CTX229544
  {
    if (empty_or_null(fix))
      fix = "XS70E049";
    else
      fix += " and XS70E049";
    vuln = TRUE;
  }
}
else if (version =~ "^6\.5($|[^0-9])")
{
  fix = "XS65ESP1064"; # CTX229543
  if (fix >!< patches) vuln = TRUE;
}
else if (version =~ "^6\.2($|[^0-9])")
{
  fix = "XS62ESP1066"; # CTX229096
  if (fix >!< patches) vuln = TRUE;
}
else if (version =~ "^6\.0\.2($|[^0-9])")
{
  fix = "XS602ECC050"; # CTX229095
  if (fix >!< patches) vuln = TRUE;
}

if (vuln)
{
  port = 0;
  report = report_items_str(
    report_items:make_array(
      "Installed version", version,
      "Missing hotfix", fix
    ),
    ordered_fields:make_list("Installed version", "Missing hotfix")
  );
  security_report_v4(port:port, severity:SECURITY_HOLE, extra:report);
}
else audit(AUDIT_INST_VER_NOT_VULN, app_name, version);

#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-1230-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(105621);
  script_version("3.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/12");

  script_cve_id("CVE-2017-17044", "CVE-2017-17045", "CVE-2017-17563", "CVE-2017-17564", "CVE-2017-17565", "CVE-2017-17566");

  script_name(english:"Debian DLA-1230-1 : xen security update");
  script_summary(english:"Checks dpkg output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Multiple vulnerabilities have been discovered in the Xen hypervisor,
which could result in denial of service, information leaks, privilege
escalation or the execution of arbitrary code.

For Debian 7 'Wheezy', these problems have been fixed in version
4.1.6.lts1-11.

We recommend that you upgrade your xen packages.

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA security advisory. Tenable has attempted
to automatically clean and format it as much as possible without
introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://lists.debian.org/debian-lts-announce/2018/01/msg00003.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/wheezy/xen"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxen-4.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxen-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxen-ocaml");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxen-ocaml-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxenstore3.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-docs-4.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-hypervisor-4.1-amd64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-hypervisor-4.1-i386");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-system-amd64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-system-i386");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-utils-4.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-utils-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xenstore-utils");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2018/01/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/01/08");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"7.0", prefix:"libxen-4.1", reference:"4.1.6.lts1-11")) flag++;
if (deb_check(release:"7.0", prefix:"libxen-dev", reference:"4.1.6.lts1-11")) flag++;
if (deb_check(release:"7.0", prefix:"libxen-ocaml", reference:"4.1.6.lts1-11")) flag++;
if (deb_check(release:"7.0", prefix:"libxen-ocaml-dev", reference:"4.1.6.lts1-11")) flag++;
if (deb_check(release:"7.0", prefix:"libxenstore3.0", reference:"4.1.6.lts1-11")) flag++;
if (deb_check(release:"7.0", prefix:"xen-docs-4.1", reference:"4.1.6.lts1-11")) flag++;
if (deb_check(release:"7.0", prefix:"xen-hypervisor-4.1-amd64", reference:"4.1.6.lts1-11")) flag++;
if (deb_check(release:"7.0", prefix:"xen-hypervisor-4.1-i386", reference:"4.1.6.lts1-11")) flag++;
if (deb_check(release:"7.0", prefix:"xen-system-amd64", reference:"4.1.6.lts1-11")) flag++;
if (deb_check(release:"7.0", prefix:"xen-system-i386", reference:"4.1.6.lts1-11")) flag++;
if (deb_check(release:"7.0", prefix:"xen-utils-4.1", reference:"4.1.6.lts1-11")) flag++;
if (deb_check(release:"7.0", prefix:"xen-utils-common", reference:"4.1.6.lts1-11")) flag++;
if (deb_check(release:"7.0", prefix:"xenstore-utils", reference:"4.1.6.lts1-11")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");

#
# (C) Tenable Network Security, Inc.
#
# The package checks in this plugin were extracted from OracleVM
# Security Advisory OVMSA-2017-0178.
#

include("compat.inc");

if (description)
{
  script_id(105251);
  script_version("3.5");
  script_cvs_date("Date: 2019/09/27 13:00:35");

  script_cve_id("CVE-2017-15592", "CVE-2017-17044", "CVE-2017-17045");

  script_name(english:"OracleVM 3.2 : xen (OVMSA-2017-0178)");
  script_summary(english:"Checks the RPM output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote OracleVM host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The remote OracleVM system is missing necessary patches to address
critical security updates :

  - From 2a99aa99fc84a45f505f84802af56b006d14c52e Mon Sep 17
    00:00:00 2001 From: Andrew Cooper Date: Fri, 19 Aug 2016
    15:08:10 +0100 Subject: [PATCH] xen/physmap: Do not
    permit a guest to populate PoD pages for itself PoD is
    supposed to be entirely transparent to guest, but this
    interface has been left exposed for a long time. The use
    of PoD requires careful co-ordination by the toolstack
    with the XENMEM_[get,set]_pod_target hypercalls, and
    xenstore ballooning target. The best a guest can do
    without toolstack cooperation crash. Furthermore, there
    are combinations of features (e.g. c/s c63868ff 'libxl:
    disallow PCI device assignment for HVM guest when PoD is
    enabled') which a toolstack might wish to explicitly
    prohibit (in this case, because the two simply don't
    function in combination). In such cases, the guest
    mustn't be able to subvert the configuration chosen by
    the toolstack.

    Conflict: xen/common/memory.c

  - Due to the history performance reason, we decide to
    disable PoD feature in old OVM product. Please don't set
    maxmem>memory XSA-246,XSA-247 [bug 27120669]
    (CVE-2017-17044, CVE-2017-17045)

  - x86/shadow: correct SH_LINEAR mapping detection in
    sh_guess_wrmap The fix for XSA-243 / CVE-2017-15592 (c/s
    bf2b4eadcf379) introduced a change in behaviour for
    sh_guest_wrmap, where it had to cope with no shadow
    linear mapping being present. As the name suggests,
    guest_vtable is a mapping of the guests pagetable, not
    Xen's pagetable, meaning that it isn't the pagetable we
    need to check for the shadow linear slot in. The
    practical upshot is that a shadow HVM vcpu which
    switches into 4-level paging mode, with an L4 pagetable
    that contains a mapping which aliases Xen's
    SH_LINEAR_PT_VIRT_START will fool the safety check for
    whether a SHADOW_LINEAR mapping is present. As the check
    passes (when it should have failed), Xen subsequently
    falls over the missing mapping with a pagefault such as:
    (XEN) Pagetable walk from ffff8140a0503880: (XEN)
    L4[0x102] = 000000046c218063 ffffffffffffffff (XEN)
    L3[0x102] = 000000046c218063 ffffffffffffffff (XEN)
    L2[0x102] = 000000046c218063 ffffffffffffffff (XEN)
    L1[0x103] = 0000000000000000 ffffffffffffffff This is
    part of XSA-243. (CVE-2017-15592)

  - dpci: Fix a race during unbinding of MSI interrupt The
    check of hvm_irq_dpci->mapping and read of flags are not
    protected in same critical area, so the unbind of MSI
    interrupt may intercepts between them. Like below scene:
    CPU0 CPU1

    ---- ---- hvm_do_IRQ_dpci !test_bit(mirq,
    dpci->mapping)) return 0  spin_lock(&d->event_lock) 
    hvm_irq_dpci->mirq[machine_gsi].flags = 0 
    clear_bit(machine_gsi, hvm_irq_dpci->mapping) 
    spin_unlock(&d->event_lock)  <SoftIRQ> hvm_dirq_assist
    spin_lock(&d->event_lock)  if (
    pt_irq_need_timer(hvm_irq_dpci->mirq[pirq].flags))
    set_timer  spin_unlock(&d->event_lock)  Then set_timer
    is mistakenly called which access uninitialized timer
    struct. Then page fault happen and a backtrace like
    below: (XEN) Xen call trace: (XEN) [<ffff82c480124c92>]
    set_timer+0x92/0x170 (XEN) [<ffff82c48013bb03>]
    hvm_dirq_assist+0x1c3/0x1e0 (XEN) [<ffff82c4801235ff>]
    do_tasklet_work_percpu+0x7f/0x120 (XEN)
    [<ffff82c480121915>] __do_softirq+0x65/0x90 (XEN)
    [<ffff82c4801f7fb6>] process_softirqs+0x6/0x10 (XEN)
    (XEN) Pagetable walk from 0000000000000008: (XEN)
    L4[0x000] = 0000002104cc1067 0000000000289430 (XEN)
    L3[0x000] = 000000212ecd8067 00000000002b3447 (XEN)
    L2[0x000] = 0000000000000000 ffffffffffffffff (XEN)
    (XEN) **************************************** (XEN)
    Panic on CPU 41: (XEN) FATAL PAGE FAULT (XEN)
    [error_code=0002] (XEN) Faulting linear address:
    0000000000000008 (XEN)
    **************************************** This issue is
    OVM3.2 only as OVM3.3 or above already has similar fix
    in pt_pirq_iterate"
  );
  # https://oss.oracle.com/pipermail/oraclevm-errata/2017-December/000810.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?88e7e3ea"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected xen / xen-devel / xen-tools packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:vm:xen");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:vm:xen-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:vm:xen-tools");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:vm_server:3.2");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/10/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/12/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/12/14");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"OracleVM Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/OracleVM/release", "Host/OracleVM/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/OracleVM/release");
if (isnull(release) || "OVS" >!< release) audit(AUDIT_OS_NOT, "OracleVM");
if (! preg(pattern:"^OVS" + "3\.2" + "(\.[0-9]|$)", string:release)) audit(AUDIT_OS_NOT, "OracleVM 3.2", "OracleVM " + release);
if (!get_kb_item("Host/OracleVM/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "OracleVM", cpu);
if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", cpu);

flag = 0;
if (rpm_check(release:"OVS3.2", reference:"xen-4.1.3-25.el5.223.99")) flag++;
if (rpm_check(release:"OVS3.2", reference:"xen-devel-4.1.3-25.el5.223.99")) flag++;
if (rpm_check(release:"OVS3.2", reference:"xen-tools-4.1.3-25.el5.223.99")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "xen / xen-devel / xen-tools");
}

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 201801-14.
#
# The advisory text is Copyright (C) 2001-2018 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike 
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#

include("compat.inc");

if (description)
{
  script_id(106038);
  script_version("1.3");
  script_cvs_date("Date: 2019/04/05 23:25:06");

  script_cve_id("CVE-2017-12134", "CVE-2017-12135", "CVE-2017-12136", "CVE-2017-12137", "CVE-2017-15588", "CVE-2017-15589", "CVE-2017-15590", "CVE-2017-15591", "CVE-2017-15592", "CVE-2017-15593", "CVE-2017-15594", "CVE-2017-15595", "CVE-2017-17044", "CVE-2017-17045", "CVE-2017-17046", "CVE-2017-17563", "CVE-2017-17564", "CVE-2017-17565", "CVE-2017-17566");
  script_xref(name:"GLSA", value:"201801-14");

  script_name(english:"GLSA-201801-14 : Xen: Multiple vulnerabilities");
  script_summary(english:"Checks for updated package(s) in /var/db/pkg");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Gentoo host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The remote host is affected by the vulnerability described in GLSA-201801-14
(Xen: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Xen. Please review the
      referenced CVE identifiers for details.
  
Impact :

    A local attacker could potentially execute arbitrary code with the
      privileges of the Xen (QEMU) process on the host, gain privileges on the
      host system, or cause a Denial of Service condition.
  
Workaround :

    There is no known workaround at this time."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/201801-14"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All Xen users should upgrade to the latest version:
      # emerge --sync
      # emerge --ask --oneshot --verbose '>=app-emulation/xen-4.9.1-r1'
    All Xen tools users should upgrade to the latest version:
      # emerge --sync
      # emerge --ask --oneshot --verbose
      '>=app-emulation/xen-tools-4.9.1-r1'"
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:xen");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:xen-tools");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2018/01/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/01/15");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Gentoo Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("qpkg.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo");
if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (qpkg_check(package:"app-emulation/xen", unaffected:make_list("ge 4.9.1-r1"), vulnerable:make_list("lt 4.9.1-r1"))) flag++;
if (qpkg_check(package:"app-emulation/xen-tools", unaffected:make_list("ge 4.9.1-r1"), vulnerable:make_list("lt 4.9.1-r1"))) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:qpkg_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = qpkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "Xen");
}

#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Fedora Security Advisory FEDORA-2017-4bfcd57172.
#

include("compat.inc");

if (description)
{
  script_id(105869);
  script_version("3.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04");

  script_cve_id("CVE-2017-17044", "CVE-2017-17045");
  script_xref(name:"FEDORA", value:"2017-4bfcd57172");

  script_name(english:"Fedora 27 : xen (2017-4bfcd57172)");
  script_summary(english:"Checks rpm output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Fedora host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"xen: various flaws (#1518214) x86: infinite loop due to missing PoD
error checking [XSA-246] Missing p2m error checking in PoD code
[XSA-247]

Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as
possible without introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bodhi.fedoraproject.org/updates/FEDORA-2017-4bfcd57172"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected xen package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:xen");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:27");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/11/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/12/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/01/15");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Fedora Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = pregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! preg(pattern:"^27([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 27", "Fedora " + os_ver);

if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);


flag = 0;
if (rpm_check(release:"FC27", reference:"xen-4.9.1-2.fc27")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "xen");
}