Vulnerabilities > CVE-2020-11743 - Improper Handling of Exceptional Conditions vulnerability in multiple products

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2020:1124-1.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(136076);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/07/10");

  script_cve_id("CVE-2020-11739", "CVE-2020-11740", "CVE-2020-11741", "CVE-2020-11742", "CVE-2020-11743");
  script_xref(name:"IAVB", value:"2019-B-0091-S");
  script_xref(name:"IAVB", value:"2020-B-0023-S");

  script_name(english:"SUSE SLED15 / SLES15 Security Update : xen (SUSE-SU-2020:1124-1)");
  script_summary(english:"Checks rpm output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote SUSE host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"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)

Note that Tenable Network Security has extracted the preceding
description block directly from the SUSE 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://bugzilla.suse.com/show_bug.cgi?id=1027519"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1134506"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1155200"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1157490"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1160932"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1165206"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1167007"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1167152"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1168140"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1168142"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1168143"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1169392"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2020-11739/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2020-11740/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2020-11741/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2020-11742/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2020-11743/"
  );
  # https://www.suse.com/support/update/announcement/2020/suse-su-20201124-1/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?bda4ce7e"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"To install this SUSE Security Update use the SUSE recommended
installation methods like YaST online_update or 'zypper patch'.

Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Module for Server Applications 15-SP1 :

zypper in -t patch
SUSE-SLE-Module-Server-Applications-15-SP1-2020-1124=1

SUSE Linux Enterprise Module for Open Buildservice Development Tools
15-SP1 :

zypper in -t patch
SUSE-SLE-Module-Development-Tools-OBS-15-SP1-2020-1124=1

SUSE Linux Enterprise Module for Basesystem 15-SP1 :

zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP1-2020-1124=1"
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/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-2020-11741");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-doc-html");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-libs-32bit-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-libs-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-tools-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-tools-domU");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-tools-domU-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:15");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/04/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/04/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/29");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2020 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/cpu", "Host/SuSE/release", "Host/SuSE/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/SuSE/release");
if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "SUSE");
os_ver = os_ver[1];
if (! preg(pattern:"^(SLED15|SLES15)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLED15 / SLES15", "SUSE " + os_ver);

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

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^i[3-6]86$" && "x86_64" >!< cpu && "s390x" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "SUSE " + os_ver, cpu);
if (cpu >!< "x86_64") audit(AUDIT_ARCH_NOT, "x86_64", cpu);


sp = get_kb_item("Host/SuSE/patchlevel");
if (isnull(sp)) sp = "0";
if (os_ver == "SLES15" && (! preg(pattern:"^(1)$", string:sp))) audit(AUDIT_OS_NOT, "SLES15 SP1", os_ver + " SP" + sp);
if (os_ver == "SLED15" && (! preg(pattern:"^(1)$", string:sp))) audit(AUDIT_OS_NOT, "SLED15 SP1", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"xen-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"xen-debugsource-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"xen-devel-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"xen-tools-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"xen-tools-debuginfo-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"xen-debugsource-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"xen-doc-html-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"xen-libs-32bit-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"xen-libs-32bit-debuginfo-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"xen-debugsource-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"xen-libs-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"xen-libs-debuginfo-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"xen-tools-domU-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"xen-tools-domU-debuginfo-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLED15", sp:"1", cpu:"x86_64", reference:"xen-debugsource-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLED15", sp:"1", cpu:"x86_64", reference:"xen-doc-html-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLED15", sp:"1", cpu:"x86_64", reference:"xen-libs-32bit-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLED15", sp:"1", cpu:"x86_64", reference:"xen-libs-32bit-debuginfo-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLED15", sp:"1", cpu:"x86_64", reference:"xen-debugsource-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLED15", sp:"1", cpu:"x86_64", reference:"xen-libs-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLED15", sp:"1", cpu:"x86_64", reference:"xen-libs-debuginfo-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLED15", sp:"1", cpu:"x86_64", reference:"xen-tools-domU-4.12.2_04-3.15.1")) flag++;
if (rpm_check(release:"SLED15", sp:"1", cpu:"x86_64", reference:"xen-tools-domU-debuginfo-4.12.2_04-3.15.1")) flag++;


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