Juniper Junos OS Vulnerability (JSA112178)

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

include('compat.inc');

if (description)
{
  script_id(365675);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/14");

  script_cve_id("CVE-2026-102080");
  script_xref(name:"JSA", value:"JSA112178");

  script_name(english:"Juniper Junos OS Vulnerability (JSA112178)");

  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 JSA112178
advisory.

  - An Improper Resource Locking vulnerability in the clock synchronization daemon (clksyncd) of Juniper
    Networks Junos OS on MX Series allows a unauthenticated, logically adjacent attacker to cause a Denial-of-
    Service (DoS). If a SyncE or PTP upstream node sends a malformed message to an MX device equipped with
    SCBE3, a false 19.44MHz alarm is generated on the master RE. This leads to persistent RE switchovers and a
    clksyncd process crash. This issue is outside the attacker's direct control as it's a race condition. This
    issue affects Junos OS on MX Series: * All versions before 23.2R2-S7.7; * 23.4 versions before
    23.4R2-S8.13; * 24.2 versions before 24.2R2-S5.5; * 24.4 versions before 24.4R2-S4; * 25.2 versions before
    25.2R2-S1; * 25.4 versions before 25.4R1-S2. (CVE-2026-102080)

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-MX-Series-Malformed-SyncE-or-PTP-clock-input-causes-continuous-RE-switchover-CVE-2026-102080
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?edc5bfd9");
  script_set_attribute(attribute:"solution", value:
"Apply the relevant Junos software release referenced in Juniper advisory JSA112178");
  script_set_cvss_base_vector("CVSS2#AV:A/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:A/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:"cvss_score_source", value:"CVE-2026-102080");

  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 !~ "^MX")
{
  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':'^MX'},
  {'min_ver':'23.4', 'fixed_ver':'23.4R2-S8.13', 'model':'^MX'},
  {'min_ver':'24.2', 'fixed_ver':'24.2R2-S5.5', 'model':'^MX'},
  {'min_ver':'24.4', 'fixed_ver':'24.4R2-S4', 'model':'^MX'},
  {'min_ver':'25.2', 'fixed_ver':'25.2R2-S1', 'model':'^MX'},
  {'min_ver':'25.4', 'fixed_ver':'25.4R1-S2', 'model':'^MX'}
];

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);