Linux Distros Unpatched Vulnerability : CVE-2026-123125

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

include('compat.inc');

if (description)
{
  script_id(377456);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/11/07");

  script_cve_id("CVE-2026-123125");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-123125");

  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.

  - The Symfony Validator component IpValidator incompletely classifies internal addresses in the filtered
    modes of the Ip constraint, so some internal addresses are accepted as public, which can lead to Server-
    Side Request Forgery (SSRF) in Symfony versions prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23,
    and 8.x prior to 8.1.11. In these modes, IpValidator relies on the PHP flags FILTER_FLAG_NO_PRIV_RANGE and
    FILTER_FLAG_NO_RES_RANGE to classify addresses as public, private, or reserved. These flags do not cover
    shared address space (100.64.0.0/10) or IPv4-mapped, IPv4-compatible, and 6to4 IPv6 addresses, which can
    embed internal IPv4 addresses. A value such as ::ffff:127.0.0.1 can therefore pass validation even though
    it points to an internal host. Applications that rely on the Ip constraint to reject internal addresses,
    for example before making a server-side request to a user-supplied address, can be exposed to SSRF.
    (CVE-2026-123125)

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-2026-123125");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-123125");
  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:N/A:N");
  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:L/I:L/A:N");
  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:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-123125");

  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:"2026/11/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/11/07");

  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:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.10");
  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:symfony");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:symfony");
  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/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-26.04", "Host/OS/Ubuntu Linux-26.10");

  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": "php-symfony"},
          {"reference": "php-symfony-asset"},
          {"reference": "php-symfony-browser-kit"},
          {"reference": "php-symfony-cache"},
          {"reference": "php-symfony-config"},
          {"reference": "php-symfony-console"},
          {"reference": "php-symfony-css-selector"},
          {"reference": "php-symfony-dependency-injection"},
          {"reference": "php-symfony-dom-crawler"},
          {"reference": "php-symfony-dotenv"},
          {"reference": "php-symfony-error-handler"},
          {"reference": "php-symfony-event-dispatcher"},
          {"reference": "php-symfony-expression-language"},
          {"reference": "php-symfony-filesystem"},
          {"reference": "php-symfony-finder"},
          {"reference": "php-symfony-form"},
          {"reference": "php-symfony-http-client"},
          {"reference": "php-symfony-http-foundation"},
          {"reference": "php-symfony-http-kernel"},
          {"reference": "php-symfony-inflector"},
          {"reference": "php-symfony-intl"},
          {"reference": "php-symfony-ldap"},
          {"reference": "php-symfony-lock"},
          {"reference": "php-symfony-mailer"},
          {"reference": "php-symfony-messenger"},
          {"reference": "php-symfony-mime"},
          {"reference": "php-symfony-notifier"},
          {"reference": "php-symfony-options-resolver"},
          {"reference": "php-symfony-password-hasher"},
          {"reference": "php-symfony-process"},
          {"reference": "php-symfony-property-access"},
          {"reference": "php-symfony-property-info"},
          {"reference": "php-symfony-rate-limiter"},
          {"reference": "php-symfony-routing"},
          {"reference": "php-symfony-runtime"},
          {"reference": "php-symfony-security-core"},
          {"reference": "php-symfony-security-csrf"},
          {"reference": "php-symfony-security-guard"},
          {"reference": "php-symfony-security-http"},
          {"reference": "php-symfony-semaphore"},
          {"reference": "php-symfony-serializer"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "php-symfony"},
          {"reference": "php-symfony-asset"},
          {"reference": "php-symfony-asset-mapper"},
          {"reference": "php-symfony-browser-kit"},
          {"reference": "php-symfony-cache"},
          {"reference": "php-symfony-clock"},
          {"reference": "php-symfony-config"},
          {"reference": "php-symfony-console"},
          {"reference": "php-symfony-css-selector"},
          {"reference": "php-symfony-dependency-injection"},
          {"reference": "php-symfony-dom-crawler"},
          {"reference": "php-symfony-dotenv"},
          {"reference": "php-symfony-error-handler"},
          {"reference": "php-symfony-event-dispatcher"},
          {"reference": "php-symfony-expression-language"},
          {"reference": "php-symfony-filesystem"},
          {"reference": "php-symfony-finder"},
          {"reference": "php-symfony-form"},
          {"reference": "php-symfony-html-sanitizer"},
          {"reference": "php-symfony-http-client"},
          {"reference": "php-symfony-http-foundation"},
          {"reference": "php-symfony-http-kernel"},
          {"reference": "php-symfony-intl"},
          {"reference": "php-symfony-ldap"},
          {"reference": "php-symfony-lock"},
          {"reference": "php-symfony-mailer"},
          {"reference": "php-symfony-messenger"},
          {"reference": "php-symfony-mime"},
          {"reference": "php-symfony-notifier"},
          {"reference": "php-symfony-options-resolver"},
          {"reference": "php-symfony-password-hasher"},
          {"reference": "php-symfony-process"},
          {"reference": "php-symfony-property-access"},
          {"reference": "php-symfony-property-info"},
          {"reference": "php-symfony-rate-limiter"},
          {"reference": "php-symfony-remote-event"},
          {"reference": "php-symfony-routing"},
          {"reference": "php-symfony-runtime"},
          {"reference": "php-symfony-scheduler"},
          {"reference": "php-symfony-security-core"},
          {"reference": "php-symfony-security-csrf"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "symfony"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "symfony"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "symfony"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "symfony"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "symfony"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "symfony"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.10",
        "pkgs": [
          {"reference": "symfony"}
        ]
      }
    ]
  }
};

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 third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

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');
}