Juniper Junos OS Vulnerability (JSA100055)

#TRUSTED 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
#TRUST-RSA-SHA256 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
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
# This file was created in whole or in part by AI.
##

include('compat.inc');

if (description)
{
  script_id(305081);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/06");

  script_cve_id("CVE-2025-52951");
  script_xref(name:"JSA", value:"JSA100055");

  script_name(english:"Juniper Junos OS Vulnerability (JSA100055)");

  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 JSA100055
advisory.

  - A Protection Mechanism Failure vulnerability in kernel filter processing of Juniper Networks Junos OS
    allows an attacker sending IPv6 traffic destined to the device to effectively bypass any firewall
    filtering configured on the interface. Due to an issue with Junos OS kernel filter processing, the
    'payload-protocol' match is not being supported, causing any term containing it to accept all packets
    without taking any other action. In essence, these firewall filter terms were being processed as an
    'accept' for all traffic on the interface destined for the control plane, even when used in combination
    with other match criteria. This issue only affects firewall filters protecting the device's control plane.
    Transit firewall filtering is unaffected by this vulnerability. This issue affects Junos OS: * all
    versions before 21.2R3-S9, * from 21.4 before 21.4R3-S11, * from 22.2 before 22.2R3-S7, * from 22.4 before
    22.4R3-S7, * from 23.2 before 23.2R2-S4, * from 23.4 before 23.4R2-S5, * from 24.2 before 24.2R2-S1, *
    from 24.4 before 24.4R1-S2, 24.4R2. This is a more complete fix for previously published CVE-2024-21607
    (JSA75748). (CVE-2025-52951)

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/2025-07-Security-Bulletin-Junos-OS-IPv6-firewall-filter-fails-to-match-payload-protocol-CVE-2025-52951
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6479df8d");
  script_set_attribute(attribute:"solution", value:
"Apply the relevant Junos software release referenced in Juniper advisory JSA100055");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
  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:C/C:N/I:L/A:N");
  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:N/SC:N/SI:L/SA:N");
  script_set_attribute(attribute:"cvss4_supplemental", value:"CVSS:4.0/AU:Y/R:U/RE:M");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-52951");

  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:"2025/07/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/07/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/06");

  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");

  exit(0);
}

include('junos.inc');
include('junos_kb_cmd_func.inc');


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

var vuln_ranges = [
  {'min_ver':'21.4', 'fixed_ver':'21.4R3-S11'},
  {'min_ver':'22.2', 'fixed_ver':'22.2R3-S7'},
  {'min_ver':'22.4', 'fixed_ver':'22.4R3-S7'},
  {'min_ver':'23.2', 'fixed_ver':'23.2R2-S4'},
  {'min_ver':'23.4', 'fixed_ver':'23.4R2-S5'},
  {'min_ver':'24.2', 'fixed_ver':'24.2R2-S1'},
  {'min_ver':'24.4', 'fixed_ver':'24.4R1-S2', 'fixed_display':'24.4R1-S2, 24.4R2'}
];

var override = TRUE;
var buf1 = junos_command_kb_item(cmd:'show configuration | display set');
if (buf1)
{
  var conf1 = !junos_check_config(buf:buf1, pattern:"^set .*firewall family inet6 filter \S+ term \S+ from payload-protocol");
  if (conf1)
    audit(AUDIT_OS_CONF_NOT_VULN, 'Junos OS');
  override = FALSE;
}

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);
junos_report(ver:ver, fix:fix, override:override, severity:SECURITY_WARNING);