Linux Distros Unpatched Vulnerability : CVE-2025-11561

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

include('compat.inc');

if (description)
{
  script_id(270209);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/11");

  script_cve_id("CVE-2025-11561");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2025-11561");

  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 the integration of Active Directory and the System Security Services Daemon (SSSD) on
    Linux systems. In default configurations, the Kerberos local authentication plugin
    (sssd_krb5_localauth_plugin) is enabled, but a fallback to the an2ln plugin is possible. This fallback
    allows an attacker with permission to modify certain AD attributes (such as userPrincipalName or
    samAccountName) to impersonate privileged users, potentially resulting in unauthorized access or privilege
    escalation on domain-joined Linux hosts. (CVE-2025-11561)

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-2025-11561");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2025-11561");
  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:S/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:L/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:"cvss_score_source", value:"CVE-2025-11561");

  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:"2025/10/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/10/13");

  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: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:25.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:sssd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:sssd");
  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("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/Debian Linux-11", "Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "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-25.04", "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 = {
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "libipa-hbac-dev"},
          {"reference": "libipa-hbac0"},
          {"reference": "libnss-sss"},
          {"reference": "libpam-sss"},
          {"reference": "libsss-certmap-dev"},
          {"reference": "libsss-certmap0"},
          {"reference": "libsss-idmap-dev"},
          {"reference": "libsss-idmap0"},
          {"reference": "libsss-nss-idmap-dev"},
          {"reference": "libsss-nss-idmap0"},
          {"reference": "libsss-simpleifp-dev"},
          {"reference": "libsss-simpleifp0"},
          {"reference": "libsss-sudo"},
          {"reference": "python3-libipa-hbac"},
          {"reference": "python3-libsss-nss-idmap"},
          {"reference": "python3-sss"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-ad-common"},
          {"reference": "sssd-common"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-idp"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"}
        ]
      }
    ]
  },
  "Debian Linux-11": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "11",
        "pkgs": [
          {"reference": "libipa-hbac-dev"},
          {"reference": "libipa-hbac0"},
          {"reference": "libnss-sss"},
          {"reference": "libpam-sss"},
          {"reference": "libsss-certmap-dev"},
          {"reference": "libsss-certmap0"},
          {"reference": "libsss-idmap-dev"},
          {"reference": "libsss-idmap0"},
          {"reference": "libsss-nss-idmap-dev"},
          {"reference": "libsss-nss-idmap0"},
          {"reference": "libsss-simpleifp-dev"},
          {"reference": "libsss-simpleifp0"},
          {"reference": "libsss-sudo"},
          {"reference": "libwbclient-sssd"},
          {"reference": "libwbclient-sssd-dev"},
          {"reference": "python3-libipa-hbac"},
          {"reference": "python3-libsss-nss-idmap"},
          {"reference": "python3-sss"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-ad-common"},
          {"reference": "sssd-common"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "libipa-hbac-dev"},
          {"reference": "libipa-hbac0"},
          {"reference": "libnss-sss"},
          {"reference": "libpam-sss"},
          {"reference": "libsss-certmap-dev"},
          {"reference": "libsss-certmap0"},
          {"reference": "libsss-idmap-dev"},
          {"reference": "libsss-idmap0"},
          {"reference": "libsss-nss-idmap-dev"},
          {"reference": "libsss-nss-idmap0"},
          {"reference": "libsss-simpleifp-dev"},
          {"reference": "libsss-simpleifp0"},
          {"reference": "libsss-sudo"},
          {"reference": "libwbclient-sssd"},
          {"reference": "libwbclient-sssd-dev"},
          {"reference": "python3-libipa-hbac"},
          {"reference": "python3-libsss-nss-idmap"},
          {"reference": "python3-sss"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-ad-common"},
          {"reference": "sssd-common"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "libipa-hbac-dev"},
          {"reference": "libipa-hbac0t64"},
          {"reference": "libnss-sss"},
          {"reference": "libpam-sss"},
          {"reference": "libsss-certmap-dev"},
          {"reference": "libsss-certmap0"},
          {"reference": "libsss-idmap-dev"},
          {"reference": "libsss-idmap0"},
          {"reference": "libsss-nss-idmap-dev"},
          {"reference": "libsss-nss-idmap0"},
          {"reference": "libsss-sudo"},
          {"reference": "python3-libipa-hbac"},
          {"reference": "python3-libsss-nss-idmap"},
          {"reference": "python3-sss"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-ad-common"},
          {"reference": "sssd-common"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-idp"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-passkey"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "libipa-hbac-dev"},
          {"reference": "libipa-hbac0t64"},
          {"reference": "libnss-sss"},
          {"reference": "libpam-sss"},
          {"reference": "libsss-certmap-dev"},
          {"reference": "libsss-certmap0"},
          {"reference": "libsss-idmap-dev"},
          {"reference": "libsss-idmap0"},
          {"reference": "libsss-nss-idmap-dev"},
          {"reference": "libsss-nss-idmap0"},
          {"reference": "libsss-sudo"},
          {"reference": "python3-libipa-hbac"},
          {"reference": "python3-libsss-nss-idmap"},
          {"reference": "python3-sss"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-ad-common"},
          {"reference": "sssd-common"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-idp"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-passkey"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.04",
        "pkgs": [
          {"reference": "libipa-hbac-dev"},
          {"reference": "libipa-hbac0t64"},
          {"reference": "libnss-sss"},
          {"reference": "libpam-sss"},
          {"reference": "libsss-certmap-dev"},
          {"reference": "libsss-certmap0"},
          {"reference": "libsss-idmap-dev"},
          {"reference": "libsss-idmap0"},
          {"reference": "libsss-nss-idmap-dev"},
          {"reference": "libsss-nss-idmap0"},
          {"reference": "libsss-sudo"},
          {"reference": "python3-libipa-hbac"},
          {"reference": "python3-libsss-nss-idmap"},
          {"reference": "python3-sss"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-ad-common"},
          {"reference": "sssd-common"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-idp"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-passkey"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "libipa-hbac-dev"},
          {"reference": "libipa-hbac0t64"},
          {"reference": "libnss-sss"},
          {"reference": "libpam-sss"},
          {"reference": "libsss-certmap-dev"},
          {"reference": "libsss-certmap0"},
          {"reference": "libsss-idmap-dev"},
          {"reference": "libsss-idmap0"},
          {"reference": "libsss-nss-idmap-dev"},
          {"reference": "libsss-nss-idmap0"},
          {"reference": "libsss-sudo"},
          {"reference": "python3-libipa-hbac"},
          {"reference": "python3-libsss-nss-idmap"},
          {"reference": "python3-sss"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-ad-common"},
          {"reference": "sssd-common"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-idp"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-passkey"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "libipa-hbac-dev"},
          {"reference": "libipa-hbac0"},
          {"reference": "libnss-sss"},
          {"reference": "libpam-sss"},
          {"reference": "libsss-idmap-dev"},
          {"reference": "libsss-idmap0"},
          {"reference": "libsss-nss-idmap-dev"},
          {"reference": "libsss-nss-idmap0"},
          {"reference": "libsss-simpleifp-dev"},
          {"reference": "libsss-simpleifp0"},
          {"reference": "libsss-sudo"},
          {"reference": "libwbclient-sssd"},
          {"reference": "libwbclient-sssd-dev"},
          {"reference": "python-libipa-hbac"},
          {"reference": "python-libsss-nss-idmap"},
          {"reference": "python-sss"},
          {"reference": "python3-libipa-hbac"},
          {"reference": "python3-libsss-nss-idmap"},
          {"reference": "python3-sss"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-ad-common"},
          {"reference": "sssd-common"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "libipa-hbac-dev"},
          {"reference": "libipa-hbac0"},
          {"reference": "libnss-sss"},
          {"reference": "libpam-sss"},
          {"reference": "libsss-certmap-dev"},
          {"reference": "libsss-certmap0"},
          {"reference": "libsss-idmap-dev"},
          {"reference": "libsss-idmap0"},
          {"reference": "libsss-nss-idmap-dev"},
          {"reference": "libsss-nss-idmap0"},
          {"reference": "libsss-simpleifp-dev"},
          {"reference": "libsss-simpleifp0"},
          {"reference": "libsss-sudo"},
          {"reference": "libwbclient-sssd"},
          {"reference": "libwbclient-sssd-dev"},
          {"reference": "python-libipa-hbac"},
          {"reference": "python-libsss-nss-idmap"},
          {"reference": "python-sss"},
          {"reference": "python3-libipa-hbac"},
          {"reference": "python3-libsss-nss-idmap"},
          {"reference": "python3-sss"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-ad-common"},
          {"reference": "sssd-common"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "libipa-hbac-dev"},
          {"reference": "libipa-hbac0"},
          {"reference": "libnss-sss"},
          {"reference": "libpam-sss"},
          {"reference": "libsss-certmap-dev"},
          {"reference": "libsss-certmap0"},
          {"reference": "libsss-idmap-dev"},
          {"reference": "libsss-idmap0"},
          {"reference": "libsss-nss-idmap-dev"},
          {"reference": "libsss-nss-idmap0"},
          {"reference": "libsss-simpleifp-dev"},
          {"reference": "libsss-simpleifp0"},
          {"reference": "libsss-sudo"},
          {"reference": "python3-libipa-hbac"},
          {"reference": "python3-libsss-nss-idmap"},
          {"reference": "python3-sss"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-ad-common"},
          {"reference": "sssd-common"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"}
        ]
      }
    ]
  }
};

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');
}