Juniper Junos OS Vulnerability (JSA107868)

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

include('compat.inc');

if (description)
{
  script_id(305590);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/10");

  script_cve_id("CVE-2026-33778");
  script_xref(name:"JSA", value:"JSA107868");
  script_xref(name:"IAVA", value:"2026-A-0314");

  script_name(english:"Juniper Junos OS Vulnerability (JSA107868)");

  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 JSA107868
advisory.

  - An Improper Validation of Syntactic Correctness of Input vulnerability in the IPsec library used by kmd
    and iked of Juniper Networks Junos OS on SRX Series and MX Series allows an unauthenticated, network-based
    attacker to cause a complete Denial-of-Service (DoS). (CVE-2026-33778)

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/2026-04-Security-Bulletin-Junos-OS-SRX-Series-MX-Series-When-a-specifically-malformed-first-ISAKMP-packet-is-received-kmd-iked-crashes-CVE-2026-33778
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ea3c1943");
  script_set_attribute(attribute:"solution", value:
"Apply the relevant Junos software release referenced in Juniper advisory JSA107868");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/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:L/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:L/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/RE:M");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-33778");

  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:"2026/04/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/08");

  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_set_attribute(attribute:"stig_severity", value:"I");
  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 !~ "^(MX|SRX)")
{
  audit(AUDIT_DEVICE_NOT_VULN, model);
}

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

var vuln_ranges = [
  {'min_ver':'23.2', 'fixed_ver':'23.2R2-S6', 'model':'^(MX|SRX)'},
  {'min_ver':'23.4', 'fixed_ver':'23.4R2-S7', 'model':'^(MX|SRX)'},
  {'min_ver':'24.2', 'fixed_ver':'24.2R2-S4', 'model':'^(MX|SRX)'},
  {'min_ver':'24.4', 'fixed_ver':'24.4R2-S3', 'model':'^(MX|SRX)'},
  {'min_ver':'25.2', 'fixed_ver':'25.2R1-S2', 'model':'^(MX|SRX)', 'fixed_display':'25.2R1-S2, 25.2R2'}
];

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_HOLE, port:0, extra:report);