EulerOS 2.0 SP3 : expat (EulerOS-SA-2019-2063)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

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

if (description)
{
  script_id(129256);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/23");

  script_cve_id(
    "CVE-2015-1283",
    "CVE-2016-4472",
    "CVE-2016-5300",
    "CVE-2018-20843"
  );
  script_bugtraq_id(75973);
  script_xref(name:"CEA-ID", value:"CEA-2021-0025");

  script_name(english:"EulerOS 2.0 SP3 : expat (EulerOS-SA-2019-2063)");

  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 expat packages installed, the
EulerOS installation on the remote host is affected by the following
vulnerabilities :

  - In libexpat in Expat before 2.2.7, XML input including
    XML names that contain a large number of colons could
    make the XML parser consume a high amount of RAM and
    CPU resources while processing (enough to be usable for
    denial-of-service attacks).(CVE-2018-20843)

  - ( Multiple integer overflows in the XML_GetBuffer
    function in Expat through 2.1.0, as used in Google
    Chrome before 44.0.2403.89 and other products, allow
    remote attackers to cause a denial of service
    (heap-based buffer overflow) or possibly have
    unspecified other impact via crafted XML data, a
    related issue to CVE-2015-2716.(CVE-2015-1283)

  - The overflow protection in Expat is removed by
    compilers with certain optimization settings, which
    allows remote attackers to cause a denial of service
    (crash) or possibly execute arbitrary code via crafted
    XML data. NOTE: this vulnerability exists because of an
    incomplete fix for CVE-2015-1283 and
    CVE-2015-2716.(CVE-2016-4472)

  - The XML parser in Expat does not use sufficient entropy
    for hash initialization, which allows context-dependent
    attackers to cause a denial of service (CPU
    consumption) via crafted identifiers in an XML
    document. NOTE: this vulnerability exists because of an
    incomplete fix for CVE-2012-0876.(CVE-2016-5300)

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-2019-2063
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6ac7b93b");
  script_set_attribute(attribute:"solution", value:
"Update the affected expat packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-4472");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"patch_publication_date", value:"2019/09/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/09/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:expat");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:expat-devel");
  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) 2019-2024 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 = ["expat-2.1.0-10.h3",
        "expat-devel-2.1.0-10.h3"];

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_WARNING,
    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, "expat");
}