Juniper Junos OS Vulnerability (JSA11223)

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

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

if (description)
{
  script_id(154127);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/20");

  script_cve_id("CVE-2021-31361");
  script_xref(name:"JSA", value:"JSA11223");

  script_name(english:"Juniper Junos OS Vulnerability (JSA11223)");

  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 JSA11223
advisory.

  - An Improper Check for Unusual or Exceptional Conditions vulnerability combined with Improper Handling of
    Exceptional Conditions in Juniper Networks Junos OS on QFX Series and PTX Series allows an unauthenticated
    network based attacker to cause increased FPC CPU utilization by sending specific IP packets which are
    being VXLAN encapsulated leading to a partial Denial of Service (DoS). Continued receipted of these
    specific traffic will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper
    Networks Junos OS on QFX Series: All versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R2-S13,
    17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R2-S8, 18.2R3-S7; 18.3 versions
    prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S7; 19.1 versions prior to
    19.1R1-S6, 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to
    19.3R3-S1; 19.4 versions prior to 19.4R2-S3, 19.4R3-S1; 20.1 versions prior to 20.1R2, 20.1R3; 20.2
    versions prior to 20.2R2, 20.2R3; 20.3 versions prior to 20.3R1-S1, 20.3R2. Juniper Networks Junos OS on
    PTX Series: All versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to
    19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R1-S4,
    19.4R3-S5; 20.1 versions prior to 20.1R2-S2, 20.1R3; 20.2 versions prior to 20.2R3-S1; 20.3 versions prior
    to 20.3R2-S1, 20.3R3; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2.
    (CVE-2021-31361)

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-QFX-Series-and-PTX-Series-FPC-resource-usage-increases-when-certain-packets-are-processed-which-are-being-VXLAN-encapsulated-CVE-2021-31361
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5ae89061");
  script_set_attribute(attribute:"solution", value:
"Apply the relevant Junos software release referenced in Juniper advisory JSA11223");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  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:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-31361");

  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_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 !~ "^(PTX|QFX)")
{
  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':'17.3R3-S11', 'model':'^(PTX|QFX)', 'fixed_display':'17.3R3-S11, 18.4R3-S9'},
  {'min_ver':'17.4', 'fixed_ver':'17.4R2-S13', 'model':'^(PTX|QFX)'},
  {'min_ver':'17.4R3', 'fixed_ver':'17.4R3-S4', 'model':'^(PTX|QFX)'},
  {'min_ver':'18.1', 'fixed_ver':'18.1R3-S12', 'model':'^(PTX|QFX)'},
  {'min_ver':'18.2', 'fixed_ver':'18.2R2-S8', 'model':'^(PTX|QFX)'},
  {'min_ver':'18.2R3', 'fixed_ver':'18.2R3-S7', 'model':'^(PTX|QFX)'},
  {'min_ver':'18.3', 'fixed_ver':'18.3R3-S4', 'model':'^(PTX|QFX)'},
  {'min_ver':'18.4', 'fixed_ver':'18.4R1-S8', 'model':'^(PTX|QFX)', 'fixed_display':'18.4R1-S8, 18.4R2-S7'},
  {'min_ver':'18.4R2', 'fixed_ver':'18.4R3-S7', 'model':'^(PTX|QFX)'},
  {'min_ver':'19.1', 'fixed_ver':'19.1R1-S6', 'model':'^(PTX|QFX)', 'fixed_display':'19.1R1-S6, 19.1R2-S2, 19.1R3-S6'},
  {'min_ver':'19.1R2', 'fixed_ver':'19.1R3-S4', 'model':'^(PTX|QFX)'},
  {'min_ver':'19.2', 'fixed_ver':'19.2R1-S6', 'model':'^(PTX|QFX)', 'fixed_display':'19.2R1-S6, 19.2R1-S7'},
  {'min_ver':'19.2R2', 'fixed_ver':'19.2R3-S2', 'model':'^(PTX|QFX)', 'fixed_display':'19.2R3-S2, 19.2R3-S3'},
  {'min_ver':'19.3', 'fixed_ver':'19.3R2-S6', 'model':'^(PTX|QFX)', 'fixed_display':'19.3R2-S6, 19.3R3-S1'},
  {'min_ver':'19.3R3', 'fixed_ver':'19.3R3-S3', 'model':'^(PTX|QFX)'},
  {'min_ver':'19.4', 'fixed_ver':'19.4R1-S4', 'model':'^(PTX|QFX)', 'fixed_display':'19.4R1-S4, 19.4R2-S3'},
  {'min_ver':'19.4R2', 'fixed_ver':'19.4R3-S5', 'model':'^(PTX|QFX)'},
  {'min_ver':'19.4R3', 'fixed_ver':'19.4R3-S1', 'model':'^(PTX|QFX)'},
  {'min_ver':'20.1', 'fixed_ver':'20.1R2', 'model':'^(PTX|QFX)', 'fixed_display':'20.1R2, 20.1R2-S2, 20.1R3'},
  {'min_ver':'20.2', 'fixed_ver':'20.2R2', 'model':'^(PTX|QFX)', 'fixed_display':'20.2R2, 20.2R3, 20.2R3-S1'},
  {'min_ver':'20.3', 'fixed_ver':'20.3R1-S1', 'model':'^(PTX|QFX)', 'fixed_display':'20.3R1-S1, 20.3R2, 20.3R2-S1, 20.3R3'},
  {'min_ver':'20.4', 'fixed_ver':'20.4R2-S1', 'model':'^(PTX|QFX)', 'fixed_display':'20.4R2-S1, 20.4R3'},
  {'min_ver':'21.1', 'fixed_ver':'21.1R1-S1', 'model':'^(PTX|QFX)', 'fixed_display':'21.1R1-S1, 21.1R2'}
];

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);