Juniper Junos OS Vulnerability (JSA11236)

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

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

if (description)
{
  script_id(154120);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/01/13");

  script_cve_id("CVE-2021-31371");
  script_xref(name:"JSA", value:"JSA11236");
  script_xref(name:"IAVA", value:"2021-A-0478-S");

  script_name(english:"Juniper Junos OS Vulnerability (JSA11236)");

  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 JSA11236
advisory.

  - Juniper Networks Junos OS uses the 128.0.0.0/2 subnet for internal communications between the RE and PFEs.
    It was discovered that packets utilizing these IP addresses may egress an QFX5110 switch, leaking
    configuration information such as heartbeats, kernel versions, etc. out to the Internet, leading to an
    information exposure vulnerability. This issue affects: Juniper Networks Junos OS on QFX5110 Series: All
    versions prior to 17.3R3-S12; 18.1 versions prior to 18.1R3-S13; 18.3 versions prior to 18.3R3-S5; 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-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to
    20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2; (CVE-2021-31371)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://kb.juniper.net/JSA11236");
  script_set_attribute(attribute:"solution", value:
"Apply the relevant Junos software release referenced in Juniper advisory JSA11236");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/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:U/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-31371");

  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) 2021-2022 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 !~ "^QFX511")
{
  audit(AUDIT_DEVICE_NOT_VULN, model);
}

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

var vuln_ranges = [
  {'min_ver':'18.1', 'fixed_ver':'18.1R3-S13', 'model':'^QFX511'},
  {'min_ver':'18.3', 'fixed_ver':'18.3R3-S5', 'model':'^QFX511'},
  {'min_ver':'19.1', 'fixed_ver':'19.1R3-S6', 'model':'^QFX511'},
  {'min_ver':'19.2', 'fixed_ver':'19.2R1-S7', 'model':'^QFX511'},
  {'min_ver':'19.2R2', 'fixed_ver':'19.2R3-S3', 'model':'^QFX511'},
  {'min_ver':'19.3', 'fixed_ver':'19.3R2-S6', 'model':'^QFX511'},
  {'min_ver':'19.3R3', 'fixed_ver':'19.3R3-S3', 'model':'^QFX511'},
  {'min_ver':'19.4', 'fixed_ver':'19.4R1-S4', 'model':'^QFX511'},
  {'min_ver':'19.4R2', 'fixed_ver':'19.4R3-S5', 'model':'^QFX511'},
  {'min_ver':'20.1', 'fixed_ver':'20.1R2-S2', 'model':'^QFX511'},
  {'min_ver':'20.1R3', 'fixed_ver':'20.1R3-S1', 'model':'^QFX511'},
  {'min_ver':'20.2', 'fixed_ver':'20.2R3-S2', 'model':'^QFX511'},
  {'min_ver':'20.3', 'fixed_ver':'20.3R3-S1', 'model':'^QFX511'},
  {'min_ver':'20.4', 'fixed_ver':'20.4R2-S1', 'model':'^QFX511', 'fixed_display':'20.4R2-S1, 20.4R3'},
  {'min_ver':'21.1', 'fixed_ver':'21.1R1-S1', 'model':'^QFX511', '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);