Linux Distros Unpatched Vulnerability : CVE-2026-13006

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

include('compat.inc');

if (description)
{
  script_id(323661);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/29");

  script_cve_id("CVE-2026-13006");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-13006");

  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.

  - ACE vulnerability in conditional configuration file processing by QOS.CH logback-core up to and including
    version 1.5.35 in Java applications, allows an attacker to execute arbitrary code circumventing existing
    protections against CVE-2025-11226 by compromising an existing logback configuration file or by injecting
    an environment variable before program execution. A successful attack requires the presence of Janino
    library to be present on the user's class path. In addition, the attacker must have write access to a
    configuration file. Alternatively, the attacker could inject a malicious environment variable pointing to
    a malicious configuration file. In both cases, the attack requires existing privilege. (CVE-2026-13006)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2026-13006");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-13006");
  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:M/Au:N/C:C/I:P/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:R/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:"cvss4_vector", value:"CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N");
  script_set_attribute(attribute:"cvss4_supplemental", value:"CVSS:4.0/S:P/AU:N/RE:M/U:Green");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-13006");

  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:"2026/06/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:8");
  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:"cpe:/o:debian:debian_linux:14.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:jcl-over-slf4j");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:jul-to-slf4j");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:log4j");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:log4j-jcl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:log4j-over-slf4j");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:log4j-slf4j");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:log4j-web");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:slf4j");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:slf4j-ext");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:slf4j-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:slf4j-jcl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:slf4j-jdk14");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:slf4j-log4j12");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:slf4j-manual");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:slf4j-migrator");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:slf4j-sources");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:logback");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:jcl-over-slf4j");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:jul-to-slf4j");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:log4j");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:log4j-jcl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:log4j-over-slf4j");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:log4j-slf4j");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:log4j-web");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:slf4j");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:slf4j-ext");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:slf4j-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:slf4j-jcl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:slf4j-jdk14");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:slf4j-log4j12");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:slf4j-manual");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:slf4j-migrator");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:slf4j-sources");
  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/CentOS Linux-8", "Host/OS/Debian Linux-11", "Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14", "Host/OS/Red Hat Enterprise Linux-10", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9");

  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/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) 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": "liblogback-java"},
          {"reference": "liblogback-java-doc"}
        ]
      }
    ]
  },
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "liblogback-java"},
          {"reference": "liblogback-java-doc"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "liblogback-java"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "liblogback-java"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "jcl-over-slf4j"},
          {"reference": "jul-to-slf4j"},
          {"reference": "log4j-over-slf4j"},
          {"reference": "slf4j"},
          {"reference": "slf4j-javadoc"},
          {"reference": "slf4j-jcl"},
          {"reference": "slf4j-jdk14"},
          {"reference": "slf4j-manual"},
          {"reference": "slf4j-migrator"},
          {"reference": "slf4j-sources"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "jcl-over-slf4j"},
          {"reference": "jul-to-slf4j"},
          {"reference": "log4j"},
          {"reference": "log4j-jcl"},
          {"reference": "log4j-over-slf4j"},
          {"reference": "log4j-slf4j"},
          {"reference": "log4j-web"},
          {"reference": "slf4j"},
          {"reference": "slf4j-ext"},
          {"reference": "slf4j-javadoc"},
          {"reference": "slf4j-jcl"},
          {"reference": "slf4j-jdk14"},
          {"reference": "slf4j-log4j12"},
          {"reference": "slf4j-manual"},
          {"reference": "slf4j-sources"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "jcl-over-slf4j"},
          {"reference": "jul-to-slf4j"},
          {"reference": "log4j"},
          {"reference": "log4j-jcl"},
          {"reference": "log4j-over-slf4j"},
          {"reference": "log4j-slf4j"},
          {"reference": "log4j-web"},
          {"reference": "slf4j"},
          {"reference": "slf4j-ext"},
          {"reference": "slf4j-javadoc"},
          {"reference": "slf4j-jcl"},
          {"reference": "slf4j-jdk14"},
          {"reference": "slf4j-log4j12"},
          {"reference": "slf4j-manual"},
          {"reference": "slf4j-sources"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "jcl-over-slf4j"},
          {"reference": "slf4j"},
          {"reference": "slf4j-jdk14"}
        ]
      }
    ]
  }
};

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');
}