Linux Distros Unpatched Vulnerability : CVE-2021-20288

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

include('compat.inc');

if (description)
{
  script_id(247485);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/08/10");

  script_cve_id("CVE-2021-20288");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2021-20288");

  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.

  - An authentication flaw was found in ceph in versions before 14.2.20. When the monitor handles
    CEPHX_GET_AUTH_SESSION_KEY requests, it doesn't sanitize other_keys, allowing key reuse. An attacker who
    can request a global_id can exploit the ability of any user to request a global_id previously associated
    with another user, as ceph does not force the reuse of old keys to generate new ones. The highest threat
    from this vulnerability is to data confidentiality and integrity as well as system availability.
    (CVE-2021-20288)

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-2021-20288");
  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:S/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:N/AC:L/PR:H/UI:N/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:"cvss_score_source", value:"CVE-2021-20288");

  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:"2021/04/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/10");

  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:"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-14.04", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04");

  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-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "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": "librbd-dev"},
          {"reference": "librbd1"},
          {"reference": "librbd1-dbg"},
          {"reference": "python-ceph"},
          {"reference": "radosgw"},
          {"reference": "radosgw-dbg"},
          {"reference": "rbd-fuse"},
          {"reference": "rbd-fuse-dbg"},
          {"reference": "rest-bench"},
          {"reference": "rest-bench-dbg"}
        ]
      }
    ]
  },
  "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"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "ceph"},
          {"reference": "ceph-base"},
          {"reference": "ceph-common"},
          {"reference": "ceph-fuse"},
          {"reference": "ceph-mds"},
          {"reference": "ceph-mgr"},
          {"reference": "ceph-mon"},
          {"reference": "ceph-osd"},
          {"reference": "ceph-resource-agents"},
          {"reference": "ceph-test"},
          {"reference": "libcephfs-dev"},
          {"reference": "libcephfs-java"},
          {"reference": "libcephfs-jni"},
          {"reference": "libcephfs2"},
          {"reference": "librados-dev"},
          {"reference": "librados2"},
          {"reference": "libradosstriper-dev"},
          {"reference": "libradosstriper1"},
          {"reference": "librbd-dev"},
          {"reference": "librbd1"},
          {"reference": "librgw-dev"},
          {"reference": "librgw2"},
          {"reference": "python-ceph"},
          {"reference": "python-cephfs"},
          {"reference": "python-rados"},
          {"reference": "python-rbd"},
          {"reference": "python-rgw"},
          {"reference": "python3-ceph-argparse"},
          {"reference": "python3-cephfs"},
          {"reference": "python3-rados"},
          {"reference": "python3-rbd"},
          {"reference": "python3-rgw"},
          {"reference": "rados-objclass-dev"},
          {"reference": "radosgw"},
          {"reference": "rbd-fuse"},
          {"reference": "rbd-mirror"},
          {"reference": "rbd-nbd"}
        ]
      }
    ]
  }
};

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');
}