openSUSE Security Update : xen (openSUSE-2018-1331) (Foreshadow)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from openSUSE Security Update openSUSE-2018-1331.
#
# The text description of this plugin is (C) SUSE LLC.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(118563);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/19");

  script_cve_id("CVE-2018-15468", "CVE-2018-15469", "CVE-2018-15470", "CVE-2018-17963", "CVE-2018-3646");

  script_name(english:"openSUSE Security Update : xen (openSUSE-2018-1331) (Foreshadow)");
  script_summary(english:"Check for the openSUSE-2018-1331 patch");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote openSUSE host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"This update for xen fixes the following issues :

XEN was updated to the Xen 4.9.3 bug fix only release (bsc#1027519)

  - CVE-2018-17963: qemu_deliver_packet_iov accepted packet
    sizes greater than INT_MAX, which allows attackers to
    cause a denial of service or possibly have unspecified
    other impact. (bsc#1111014)

  - CVE-2018-15470: oxenstored might not have enforced the
    configured quota-maxentity. This allowed a malicious or
    buggy guest to write as many xenstore entries as it
    wishes, causing unbounded memory usage in oxenstored.
    This can lead to a system-wide DoS. (XSA-272)
    (bsc#1103279)

  - CVE-2018-15469: ARM never properly implemented grant
    table v2, either in the hypervisor or in Linux.
    Unfortunately, an ARM guest can still request v2 grant
    tables; they will simply not be properly set up,
    resulting in subsequent grant-related hypercalls hitting
    BUG() checks. An unprivileged guest can cause a BUG()
    check in the hypervisor, resulting in a
    denial-of-service (crash). (XSA-268) (bsc#1103275) Note
    that SUSE does not ship ARM Xen, so we are not affected.

  - CVE-2018-15468: The DEBUGCTL MSR contains several
    debugging features, some of which virtualise cleanly,
    but some do not. In particular, Branch Trace Store is
    not virtualised by the processor, and software has to be
    careful to configure it suitably not to lock up the
    core. As a result, it must only be available to fully
    trusted guests. Unfortunately, in the case that vPMU is
    disabled, all value checking was skipped, allowing the
    guest to choose any MSR_DEBUGCTL setting it likes. A
    malicious or buggy guest administrator (on Intel x86 HVM
    or PVH) can lock up the entire host, causing a Denial of
    Service. (XSA-269) (bsc#1103276)

  - CVE-2018-3646: Systems with microprocessors utilizing
    speculative execution and address translations may have
    allowed unauthorized disclosure of information residing
    in the L1 data cache to an attacker with local user
    access with guest OS privilege via a terminal page fault
    and a side-channel analysis. (XSA-273) (bsc#1091107)

Non security issues fixed :

  - The affinity reporting via 'xl vcpu-list' was broken
    (bsc#1106263)

  - Kernel oops in fs/dcache.c called by
    d_materialise_unique() (bsc#1094508)

This update was imported from the SUSE:SLE-12-SP3:Update update
project."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1027519"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1078292"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1091107"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1094508"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1103275"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1103276"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1103279"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1106263"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1111014"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected xen packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-doc-html");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-libs-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-tools-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-tools-domU");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xen-tools-domU-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:42.3");

  script_set_attribute(attribute:"patch_publication_date", value:"2018/10/30");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/10/31");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"SuSE Local Security Checks");

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

  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/SuSE/release");
if (isnull(release) || release =~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "openSUSE");
if (release !~ "^(SUSE42\.3)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "42.3", release);
if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

ourarch = get_kb_item("Host/cpu");
if (!ourarch) audit(AUDIT_UNKNOWN_ARCH);
if (ourarch !~ "^(x86_64)$") audit(AUDIT_ARCH_NOT, "x86_64", ourarch);

flag = 0;

if ( rpm_check(release:"SUSE42.3", reference:"xen-4.9.3_03-31.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"xen-debugsource-4.9.3_03-31.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"xen-devel-4.9.3_03-31.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"xen-doc-html-4.9.3_03-31.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"xen-libs-4.9.3_03-31.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"xen-libs-debuginfo-4.9.3_03-31.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"xen-tools-4.9.3_03-31.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"xen-tools-debuginfo-4.9.3_03-31.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"xen-tools-domU-4.9.3_03-31.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"xen-tools-domU-debuginfo-4.9.3_03-31.1") ) 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-debugsource / xen-devel / xen-doc-html / xen-libs / etc");
}