Juniper Junos OS Vulnerability (JSA11230)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(154121);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/20");

  script_cve_id("CVE-2021-31368");
  script_xref(name:"JSA", value:"JSA11230");
  script_xref(name:"IAVA", value:"2021-A-0478-S");

  script_name(english:"Juniper Junos OS Vulnerability (JSA11230)");

  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 JSA11230
advisory.

  - An Uncontrolled Resource Consumption vulnerability in the kernel of Juniper Networks JUNOS OS allows an
    unauthenticated network based attacker to cause 100% CPU load and the device to become unresponsive by
    sending a flood of traffic to the out-of-band management ethernet port. Continued receipted of a flood
    will create a sustained Denial of Service (DoS) condition. Once the flood subsides the system will recover
    by itself. An indication that the system is affected by this issue would be that kernel and netisr process
    are shown to be using a lot of CPU cycles like in the following example output: user@host> show system
    processes extensive ... PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND 16 root -72 - 0K 304K
    WAIT 1 839:40 88.96% intr{swi1: netisr 0} 0 root 97 - 0K 160K RUN 1 732:43 87.99% kernel{bcm560xgmac0 que}
    This issue affects Juniper Networks JUNOS OS on EX2300 Series, EX3400 Series, and ACX710: All versions
    prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions
    prior to 18.4R2-S8, 18.4R3-S9; 19.1 versions prior to 19.1R3-S5; 19.2 versions prior to 19.2R1-S7,
    19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R1-S4, 19.4R3-S3; 20.1
    versions prior to 20.1R2-S2, 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R2-S1,
    20.3R3; 20.4 versions prior to 20.4R2. (CVE-2021-31368)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://supportportal.juniper.net/s/article/2021-10-Security-Bulletin-Junos-OS-EX2300-Series-EX3400-Series-and-ACX710-might-become-unresponsive-if-the-out-of-band-management-port-receives-a-flood-of-traffic-CVE-2021-31368
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b25b1b3f");
  script_set_attribute(attribute:"solution", value:
"Apply the relevant Junos software release referenced in Juniper advisory JSA11230");
  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:"cvss_score_source", value:"CVE-2021-31368");

  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:"2021/10/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/10/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/10/13");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:juniper:junos");
  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) 2021-2023 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 !~ "^(ACX710|EX23|EX34)")
{
  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':'18.1R3-S13', 'model':'^(ACX710|EX23|EX34)'},
  {'min_ver':'18.2', 'fixed_ver':'18.2R3-S8', 'model':'^(ACX710|EX23|EX34)'},
  {'min_ver':'18.3', 'fixed_ver':'18.3R3-S5', 'model':'^(ACX710|EX23|EX34)'},
  {'min_ver':'18.4', 'fixed_ver':'18.4R2-S8', 'model':'^(ACX710|EX23|EX34)'},
  {'min_ver':'18.4R3', 'fixed_ver':'18.4R3-S9', 'model':'^(ACX710|EX23|EX34)'},
  {'min_ver':'19.1', 'fixed_ver':'19.1R3-S5', 'model':'^(ACX710|EX23|EX34)'},
  {'min_ver':'19.2', 'fixed_ver':'19.2R1-S7', 'model':'^(ACX710|EX23|EX34)'},
  {'min_ver':'19.2R2', 'fixed_ver':'19.2R3-S3', 'model':'^(ACX710|EX23|EX34)'},
  {'min_ver':'19.3', 'fixed_ver':'19.3R2-S6', 'model':'^(ACX710|EX23|EX34)'},
  {'min_ver':'19.3R3', 'fixed_ver':'19.3R3-S2', 'model':'^(ACX710|EX23|EX34)'},
  {'min_ver':'19.4', 'fixed_ver':'19.4R1-S4', 'model':'^(ACX710|EX23|EX34)'},
  {'min_ver':'19.4R2', 'fixed_ver':'19.4R3-S3', 'model':'^(ACX710|EX23|EX34)'},
  {'min_ver':'20.1', 'fixed_ver':'20.1R2-S2', 'model':'^(ACX710|EX23|EX34)', 'fixed_display':'20.1R2-S2, 20.1R3'},
  {'min_ver':'20.2', 'fixed_ver':'20.2R3', 'model':'^(ACX710|EX23|EX34)'},
  {'min_ver':'20.3', 'fixed_ver':'20.3R2-S1', 'model':'^(ACX710|EX23|EX34)', 'fixed_display':'20.3R2-S1, 20.3R3'},
  {'min_ver':'20.4', 'fixed_ver':'20.4R2', 'model':'^(ACX710|EX23|EX34)'}
];

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);