Linux Distros Unpatched Vulnerability : CVE-2020-27751

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(223557);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/08/18");

  script_cve_id("CVE-2020-27751");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2020-27751");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - A flaw was found in ImageMagick in MagickCore/quantum-export.c. An attacker who submits a crafted file
    that is processed by ImageMagick could trigger undefined behavior in the form of values outside the range
    of type `unsigned long long` as well as a shift exponent that is too large for 64-bit type. This would
    most likely lead to an impact to application availability, but could potentially cause other problems
    related to undefined behavior. This flaw affects ImageMagick versions prior to 7.0.9-0. (CVE-2020-27751)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2020-27751");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2020-27751");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-27751");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/12/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/03/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:imagemagick");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ImageMagick");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("set_linux_os_id.nasl", "ssh_get_info2.nasl");
  script_require_keys("Host/OS/identifier", "Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched");
  script_require_ports("Host/OS/Red Hat Enterprise Linux-9", "Host/OS/Ubuntu Linux-14.04", "Host/OS/Ubuntu Linux-16.04");

  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "imagemagick"},
          {"reference": "imagemagick-common"},
          {"reference": "imagemagick-dbg"},
          {"reference": "imagemagick-doc"},
          {"reference": "libmagick++-dev"},
          {"reference": "libmagick++5"},
          {"reference": "libmagickcore-dev"},
          {"reference": "libmagickcore5"},
          {"reference": "libmagickcore5-extra"},
          {"reference": "libmagickwand-dev"},
          {"reference": "libmagickwand5"},
          {"reference": "perlmagick"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "imagemagick"},
          {"reference": "imagemagick-6.q16"},
          {"reference": "imagemagick-common"},
          {"reference": "imagemagick-dbg"},
          {"reference": "imagemagick-doc"},
          {"reference": "libimage-magick-perl"},
          {"reference": "libimage-magick-q16-perl"},
          {"reference": "libmagick++-6-headers"},
          {"reference": "libmagick++-6.q16-5v5"},
          {"reference": "libmagick++-6.q16-dev"},
          {"reference": "libmagick++-dev"},
          {"reference": "libmagickcore-6-arch-config"},
          {"reference": "libmagickcore-6-headers"},
          {"reference": "libmagickcore-6.q16-2"},
          {"reference": "libmagickcore-6.q16-2-extra"},
          {"reference": "libmagickcore-6.q16-dev"},
          {"reference": "libmagickcore-dev"},
          {"reference": "libmagickwand-6-headers"},
          {"reference": "libmagickwand-6.q16-2"},
          {"reference": "libmagickwand-6.q16-dev"},
          {"reference": "libmagickwand-dev"},
          {"reference": "perlmagick"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "ImageMagick"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');
var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}