Vulnerabilities > CVE-2015-7995 - Remote Denial of Service vulnerability in libxslt 'libxslt/preproc.c' Type Confusion

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

include("compat.inc");

if (description)
{
  script_id(132162);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/07");

  script_cve_id(
    "CVE-2015-7995",
    "CVE-2016-1683",
    "CVE-2016-1684",
    "CVE-2016-4607",
    "CVE-2016-4608",
    "CVE-2016-4609",
    "CVE-2016-4610",
    "CVE-2019-18197"
  );

  script_name(english:"EulerOS 2.0 SP3 : libxslt (EulerOS-SA-2019-2627)");
  script_summary(english:"Checks the rpm output for the updated packages.");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the libxslt packages installed, the
EulerOS installation on the remote host is affected by the following
vulnerabilities :

  - The xsltStylePreCompute function in preproc.c in
    libxslt 1.1.28 does not check if the parent node is an
    element, which allows attackers to cause a denial of
    service via a crafted XML file, related to a 'type
    confusion' issue.(CVE-2015-7995)

  - numbers.c in libxslt before 1.1.29, as used in Google
    Chrome before 51.0.2704.63, mishandles namespace nodes,
    which allows remote attackers to cause a denial of
    service (out-of-bounds heap memory access) or possibly
    have unspecified other impact via a crafted
    document.(CVE-2016-1683)

  - numbers.c in libxslt before 1.1.29, as used in Google
    Chrome before 51.0.2704.63, mishandles the i format
    token for xsl:number data, which allows remote
    attackers to cause a denial of service (integer
    overflow or resource consumption) or possibly have
    unspecified other impact via a crafted
    document.(CVE-2016-1684)

  - libxslt in Apple iOS before 9.3.3, OS X before 10.11.6,
    iTunes before 12.4.2 on Windows, iCloud before 5.2.1 on
    Windows, tvOS before 9.2.2, and watchOS before 2.2.2
    allows remote attackers to cause a denial of service
    (memory corruption) or possibly have unspecified other
    impact via unknown vectors, a different vulnerability
    than CVE-2016-4608, CVE-2016-4609, CVE-2016-4610, and
    CVE-2016-4612.(CVE-2016-4607)

  - libxslt in Apple iOS before 9.3.3, OS X before 10.11.6,
    iTunes before 12.4.2 on Windows, iCloud before 5.2.1 on
    Windows, tvOS before 9.2.2, and watchOS before 2.2.2
    allows remote attackers to cause a denial of service
    (memory corruption) or possibly have unspecified other
    impact via unknown vectors, a different vulnerability
    than CVE-2016-4607, CVE-2016-4609, CVE-2016-4610, and
    CVE-2016-4612.(CVE-2016-4608)

  - libxslt in Apple iOS before 9.3.3, OS X before 10.11.6,
    iTunes before 12.4.2 on Windows, iCloud before 5.2.1 on
    Windows, tvOS before 9.2.2, and watchOS before 2.2.2
    allows remote attackers to cause a denial of service
    (memory corruption) or possibly have unspecified other
    impact via unknown vectors, a different vulnerability
    than CVE-2016-4607, CVE-2016-4608, CVE-2016-4610, and
    CVE-2016-4612.(CVE-2016-4609)

  - libxslt in Apple iOS before 9.3.3, OS X before 10.11.6,
    iTunes before 12.4.2 on Windows, iCloud before 5.2.1 on
    Windows, tvOS before 9.2.2, and watchOS before 2.2.2
    allows remote attackers to cause a denial of service
    (memory corruption) or possibly have unspecified other
    impact via unknown vectors, a different vulnerability
    than CVE-2016-4607, CVE-2016-4608, CVE-2016-4609, and
    CVE-2016-4612.(CVE-2016-4610)

  - In xsltCopyText in transform.c in libxslt 1.1.33, a
    pointer variable isn't reset under certain
    circumstances. If the relevant memory area happened to
    be freed and reused in a certain way, a bounds check
    could fail and memory outside a buffer could be written
    to, or uninitialized data could be
    disclosed.(CVE-2019-18197)

Note that Tenable Network Security has extracted the preceding
description block directly from the EulerOS security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2019-2627
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0feeac8d");
  script_set_attribute(attribute:"solution", value:
"Update the affected libxslt packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  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_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:"patch_publication_date", value:"2019/12/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/12/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libxslt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libxslt-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libxslt-python");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Huawei Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp");
  script_exclude_keys("Host/EulerOS/uvp_version");

  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/EulerOS/release");
if (isnull(release) || release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
if (release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0");

sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(3)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP3");

uvp = get_kb_item("Host/EulerOS/uvp_version");
if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP3", "EulerOS UVP " + uvp);

if (!get_kb_item("Host/EulerOS/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$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_ARCH_NOT, "i686 / x86_64", cpu);

flag = 0;

pkgs = ["libxslt-1.1.28-5.h6",
        "libxslt-devel-1.1.28-5.h6",
        "libxslt-python-1.1.28-5.h6"];

foreach (pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"3", reference:pkg)) 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, "libxslt");
}