Linux Distros Unpatched Vulnerability : CVE-2023-28841

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

include('compat.inc');

if (description)
{
  script_id(226947);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/01/31");

  script_cve_id("CVE-2023-28841");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2023-28841");

  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.

  - Moby is an open source container framework developed by Docker Inc. that is distributed as Docker,
    Mirantis Container Runtime, and various other downstream projects/products. The Moby daemon component
    (`dockerd`), which is developed as moby/moby is commonly referred to as *Docker*. Swarm Mode, which is
    compiled in and delivered by default in `dockerd` and is thus present in most major Moby downstreams, is a
    simple, built-in container orchestrator that is implemented through a combination of SwarmKit and
    supporting network code. The `overlay` network driver is a core feature of Swarm Mode, providing isolated
    virtual LANs that allow communication between containers and services across the cluster. This driver is
    an implementation/user of VXLAN, which encapsulates link-layer (Ethernet) frames in UDP datagrams that tag
    the frame with the VXLAN metadata, including a VXLAN Network ID (VNI) that identifies the originating
    overlay network. In addition, the overlay network driver supports an optional, off-by-default encrypted
    mode, which is especially useful when VXLAN packets traverses an untrusted network between nodes.
    Encrypted overlay networks function by encapsulating the VXLAN datagrams through the use of the IPsec
    Encapsulating Security Payload protocol in Transport mode. By deploying IPSec encapsulation, encrypted
    overlay networks gain the additional properties of source authentication through cryptographic proof, data
    integrity through check-summing, and confidentiality through encryption. When setting an endpoint up on an
    encrypted overlay network, Moby installs three iptables (Linux kernel firewall) rules that enforce both
    incoming and outgoing IPSec. These rules rely on the `u32` iptables extension provided by the `xt_u32`
    kernel module to directly filter on a VXLAN packet's VNI field, so that IPSec guarantees can be enforced
    on encrypted overlay networks without interfering with other overlay networks or other users of VXLAN. An
    iptables rule designates outgoing VXLAN datagrams with a VNI that corresponds to an encrypted overlay
    network for IPsec encapsulation. Encrypted overlay networks on affected platforms silently transmit
    unencrypted data. As a result, `overlay` networks may appear to be functional, passing traffic as
    expected, but without any of the expected confidentiality or data integrity guarantees. It is possible for
    an attacker sitting in a trusted position on the network to read all of the application traffic that is
    moving across the overlay network, resulting in unexpected secrets or user data disclosure. Thus, because
    many database protocols, internal APIs, etc. are not protected by a second layer of encryption, a user may
    use Swarm encrypted overlay networks to provide confidentiality, which due to this vulnerability this is
    no longer guaranteed. Patches are available in Moby releases 23.0.3, and 20.10.24. As Mirantis Container
    Runtime's 20.10 releases are numbered differently, users of that platform should update to 20.10.16. Some
    workarounds are available. Close the VXLAN port (by default, UDP port 4789) to outgoing traffic at the
    Internet boundary in order to prevent unintentionally leaking unencrypted traffic over the Internet,
    and/or ensure that the `xt_u32` kernel module is available on all nodes of the Swarm cluster.
    (CVE-2023-28841)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2023-28841");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2023-28841");
  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:A/AC:M/Au:S/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-28841");

  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:"2023/04/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/03/05");

  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:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:docker.io");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:docker.io");
  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) 2025-2026 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/Debian Linux-11", "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 = {
  "Debian Linux-11": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "11",
        "pkgs": [
          {"reference": "docker-doc"},
          {"reference": "docker.io"},
          {"reference": "golang-github-docker-docker-dev"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "docker.io"}
        ]
      }
    ]
  }
};

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');
}