Vulnerabilities > CVE-2019-13032 - NULL Pointer Dereference vulnerability in Flightcrew Project Flightcrew 0.9.2

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4055-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include("compat.inc");

if (description)
{
  script_id(126745);
  script_version("1.3");
  script_cvs_date("Date: 2020/01/08");

  script_cve_id("CVE-2019-13032", "CVE-2019-13241", "CVE-2019-13453");
  script_xref(name:"USN", value:"4055-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 18.10 / 19.04 : flightcrew vulnerabilities (USN-4055-1)");
  script_summary(english:"Checks dpkg output for updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Ubuntu host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Mike Salvatore discovered that FlightCrew improperly handled certain
malformed EPUB files. An attacker could potentially use this
vulnerability to cause a denial of service. (CVE-2019-13032)

Mike Salvatore discovered that FlightCrew mishandled certain malformed
EPUB files. An attacker could use this vulnerability to write
arbitrary files to the filesystem. (CVE-2019-13241)

Mike Salvatore discovered that the version of Zipios included in
FlightCrew mishandled certain malformed ZIP files. An attacker could
use this vulnerability to cause a denial of service or consume system
resources. (CVE-2019-13453).

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu 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://usn.ubuntu.com/4055-1/"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected flightcrew and / or libflightcrew0v5 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:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/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:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:flightcrew");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libflightcrew0v5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:19.04");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/06/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/07/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/07/16");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2019-2020 Canonical, Inc. / NASL script (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Ubuntu Local Security Checks");

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

  exit(0);
}


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

if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/Ubuntu/release");
if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
release = chomp(release);
if (! preg(pattern:"^(16\.04|18\.04|18\.10|19\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 16.04 / 18.04 / 18.10 / 19.04", "Ubuntu " + release);
if ( ! get_kb_item("Host/Debian/dpkg-l") ) 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, "Ubuntu", cpu);

flag = 0;

if (ubuntu_check(osver:"16.04", pkgname:"flightcrew", pkgver:"0.7.2+dfsg-6ubuntu0.1")) flag++;
if (ubuntu_check(osver:"16.04", pkgname:"libflightcrew0v5", pkgver:"0.7.2+dfsg-6ubuntu0.1")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"flightcrew", pkgver:"0.7.2+dfsg-10ubuntu0.1")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"libflightcrew0v5", pkgver:"0.7.2+dfsg-10ubuntu0.1")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"flightcrew", pkgver:"0.7.2+dfsg-12ubuntu0.1")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"libflightcrew0v5", pkgver:"0.7.2+dfsg-12ubuntu0.1")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"flightcrew", pkgver:"0.7.2+dfsg-13ubuntu0.19.04.1")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"libflightcrew0v5", pkgver:"0.7.2+dfsg-13ubuntu0.19.04.1")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "flightcrew / libflightcrew0v5");
}