Linux Distros Unpatched Vulnerability : CVE-2020-27781

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

include('compat.inc');

if (description)
{
  script_id(246297);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/09/01");

  script_cve_id("CVE-2020-27781");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2020-27781");

  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.

  - User credentials can be manipulated and stolen by Native CephFS consumers of OpenStack Manila, resulting
    in potential privilege escalation. An Open Stack Manila user can request access to a share to an arbitrary
    cephx user, including existing users. The access key is retrieved via the interface drivers. Then, all
    users of the requesting OpenStack project can view the access key. This enables the attacker to target any
    resource that the user has access to. This can be done to even admin users, compromising the ceph
    administrator. This flaw affects Ceph versions prior to 14.2.16, 15.x prior to 15.2.8, and 16.x prior to
    16.2.0. (CVE-2020-27781)

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-2020-27781");
  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:L/AC:L/Au:N/C:P/I:P/A:N");
  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:L/UI:N/S:U/C:H/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-27781");

  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:"2020/12/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ceph");
  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("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-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"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "ceph"},
          {"reference": "ceph-common"},
          {"reference": "ceph-common-dbg"},
          {"reference": "ceph-dbg"},
          {"reference": "ceph-fs-common"},
          {"reference": "ceph-fs-common-dbg"},
          {"reference": "ceph-fuse"},
          {"reference": "ceph-fuse-dbg"},
          {"reference": "ceph-mds"},
          {"reference": "ceph-mds-dbg"},
          {"reference": "ceph-resource-agents"},
          {"reference": "ceph-test"},
          {"reference": "ceph-test-dbg"},
          {"reference": "libcephfs-dev"},
          {"reference": "libcephfs-java"},
          {"reference": "libcephfs-jni"},
          {"reference": "libcephfs-jni-dbg"},
          {"reference": "libcephfs1"},
          {"reference": "libcephfs1-dbg"},
          {"reference": "librados-dev"},
          {"reference": "librados2"},
          {"reference": "librados2-dbg"},
          {"reference": "libradosstriper-dev"},
          {"reference": "libradosstriper1"},
          {"reference": "libradosstriper1-dbg"},
          {"reference": "librbd-dev"},
          {"reference": "librbd1"},
          {"reference": "librbd1-dbg"},
          {"reference": "librgw-dev"},
          {"reference": "librgw2"},
          {"reference": "librgw2-dbg"},
          {"reference": "python-ceph"},
          {"reference": "python-cephfs"},
          {"reference": "python-rados"},
          {"reference": "python-rbd"},
          {"reference": "radosgw"},
          {"reference": "radosgw-dbg"},
          {"reference": "rbd-fuse"},
          {"reference": "rbd-fuse-dbg"},
          {"reference": "rbd-mirror"},
          {"reference": "rbd-mirror-dbg"},
          {"reference": "rbd-nbd"},
          {"reference": "rbd-nbd-dbg"}
        ]
      }
    ]
  }
};

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