Juniper Junos OS Vulnerability (JSA112170)

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

include('compat.inc');

if (description)
{
  script_id(365674);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/14");

  script_cve_id("CVE-2026-102086");
  script_xref(name:"JSA", value:"JSA112170");

  script_name(english:"Juniper Junos OS Vulnerability (JSA112170)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch.");
  script_set_attribute(attribute:"description", value:
"The version of Junos OS installed on the remote host is affected by a vulnerability as referenced in the JSA112170
advisory.

  - A NULL Pointer Dereference vulnerability in the DNS plugin of Juniper Networks Junos OS on SRX Series
    allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (DoS). When
    multiple DNS queries are received in a single flow session, where one query matches a Security
    Intelligence (SecIntel) feed and another query is sent for DNS Domain Generation Algorithm (DGA) analysis,
    an error in processing logging of these asynchronous tasks can lead to an FPC crash. The exact timing
    conditions are outside an attacker's direct control. This issue affects Junos OS on SRX Series: * All
    versions before 23.2R2-S7.7; * from 23.4 before 23.4R2-S8.13; * from 24.2 before 24.2R2-S5.5; * from 24.4
    before 24.4R2-S4; * from 25.2 before 25.2R2-S1; * from 25.4 before 25.4R1-S2. (CVE-2026-102086)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://supportportal.juniper.net/s/article/2026-10-Security-Bulletin-Junos-OS-SRX-Series-Multiple-DNS-queries-processed-by-SecIntel-and-DGA-in-the-same-session-cause-a-flowd-crash-CVE-2026-102086
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b4c77ca0");
  script_set_attribute(attribute:"solution", value:
"Apply the relevant Junos software release referenced in Juniper advisory JSA112170");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L");
  script_set_attribute(attribute:"cvss4_supplemental", value:"CVSS:4.0/AU:Y/R:A/RE:M");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-102086");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/10/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/14");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:juniper:junos");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Junos Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("junos_version.nasl");
  script_require_keys("Host/Juniper/JUNOS/Version", "Host/Juniper/model");

  exit(0);
}

include('junos.inc');

var model = get_kb_item_or_exit('Host/Juniper/model');
if (model !~ "^SRX")
{
  audit(AUDIT_DEVICE_NOT_VULN, model);
}

var ver = get_kb_item_or_exit('Host/Juniper/JUNOS/Version');

var vuln_ranges = [
  {'min_ver':'0.0', 'fixed_ver':'23.2R2-S7.7', 'model':'^SRX'},
  {'min_ver':'23.4', 'fixed_ver':'23.4R2-S8.13', 'model':'^SRX'},
  {'min_ver':'24.2', 'fixed_ver':'24.2R2-S5.5', 'model':'^SRX'},
  {'min_ver':'24.4', 'fixed_ver':'24.4R2-S4', 'model':'^SRX'},
  {'min_ver':'25.2', 'fixed_ver':'25.2R2-S1', 'model':'^SRX'},
  {'min_ver':'25.4', 'fixed_ver':'25.4R1-S2', 'model':'^SRX'}
];

var fix = junos_compare_range(target_version:ver, vuln_ranges:vuln_ranges);
if (empty_or_null(fix)) audit(AUDIT_INST_VER_NOT_VULN, 'Junos OS', ver);
var report = get_report(ver:ver, fix:fix);
security_report_v4(severity:SECURITY_WARNING, port:0, extra:report);