Linux Distros Unpatched Vulnerability : CVE-2020-37167

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

include('compat.inc');

if (description)
{
  script_id(299035);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/14");

  script_cve_id("CVE-2020-37167");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2020-37167");

  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.

  - ClamAV versions prior to 0.103.0-rc contain a vulnerability in function name processing through the ClamBC
    bytecode interpreter that allows attackers to manipulate bytecode function names. Attackers can exploit
    the weak input validation in function name encoding to potentially execute malicious bytecode or cause
    unexpected behavior in the ClamAV engine. (CVE-2020-37167)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2020-37167");
  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:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/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:U/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-37167");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/02/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/02/13");

  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:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:clamav");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libclamunrar");
  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) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/Ubuntu Linux-14.04", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-25.10");

  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"))) 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": "clamav"},
          {"reference": "clamav-base"},
          {"reference": "clamav-daemon"},
          {"reference": "clamav-dbg"},
          {"reference": "clamav-docs"},
          {"reference": "clamav-freshclam"},
          {"reference": "clamav-milter"},
          {"reference": "clamav-testfiles"},
          {"reference": "libclamav-dev"},
          {"reference": "libclamav6"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "clamav"},
          {"reference": "clamav-base"},
          {"reference": "clamav-daemon"},
          {"reference": "clamav-dbg"},
          {"reference": "clamav-docs"},
          {"reference": "clamav-freshclam"},
          {"reference": "clamav-milter"},
          {"reference": "clamav-testfiles"},
          {"reference": "clamdscan"},
          {"reference": "libclamav-dev"},
          {"reference": "libclamav7"},
          {"reference": "libclamunrar"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "clamav"},
          {"reference": "clamav-base"},
          {"reference": "clamav-daemon"},
          {"reference": "clamav-docs"},
          {"reference": "clamav-freshclam"},
          {"reference": "clamav-milter"},
          {"reference": "clamav-testfiles"},
          {"reference": "clamdscan"},
          {"reference": "libclamav-dev"},
          {"reference": "libclamav7"},
          {"reference": "libclamunrar"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "clamav"},
          {"reference": "clamav-base"},
          {"reference": "clamav-daemon"},
          {"reference": "clamav-docs"},
          {"reference": "clamav-freshclam"},
          {"reference": "clamav-milter"},
          {"reference": "clamav-testfiles"},
          {"reference": "clamdscan"},
          {"reference": "libclamav-dev"},
          {"reference": "libclamav9"},
          {"reference": "libclamunrar"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "clamav"},
          {"reference": "clamav-base"},
          {"reference": "clamav-daemon"},
          {"reference": "clamav-docs"},
          {"reference": "clamav-freshclam"},
          {"reference": "clamav-milter"},
          {"reference": "clamav-testfiles"},
          {"reference": "clamdscan"},
          {"reference": "libclamav-dev"},
          {"reference": "libclamav9"},
          {"reference": "libclamunrar"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "clamav"},
          {"reference": "clamav-base"},
          {"reference": "clamav-daemon"},
          {"reference": "clamav-docs"},
          {"reference": "clamav-freshclam"},
          {"reference": "clamav-milter"},
          {"reference": "clamav-testfiles"},
          {"reference": "clamdscan"},
          {"reference": "libclamav-dev"},
          {"reference": "libclamav11t64"},
          {"reference": "libclamunrar"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "clamav"},
          {"reference": "clamav-base"},
          {"reference": "clamav-daemon"},
          {"reference": "clamav-doc"},
          {"reference": "clamav-docs"},
          {"reference": "clamav-freshclam"},
          {"reference": "clamav-milter"},
          {"reference": "clamav-testfiles"},
          {"reference": "clamdscan"},
          {"reference": "libclamav-dev"},
          {"reference": "libclamav12"},
          {"reference": "libclamunrar"}
        ]
      }
    ]
  }
};

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_HOLE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}