Junos OS Invalid BGP Update Termination Denial Of Service Vulnerability (JSA11013)

#
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(136828);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/20");

  script_cve_id("CVE-2020-1632");
  script_xref(name:"JSA", value:"JSA11013");
  script_xref(name:"IAVA", value:"2020-A-0162-S");

  script_name(english:"Junos OS Invalid BGP Update Termination Denial Of Service Vulnerability (JSA11013)");

  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 prior to 16.1R7-S6, 16.2R2-S11, 17.1R2-S11, 17.2R1-S9,
17.2X75-D105, 17.3R2-S5, 17.4R2-S8, 18.1R3-S8, 18.2R2-S6, 18.2X75-D12, 18.3R1-S6, 18.4R1-S5, 19.1R1-S3, or 19.2R1-S2.
It is, therefore, affected by a denial of service (DoS) vulnerability. An unauthenticated, remote attacker can exploit
this, by sending a specific BGP UPDATE message, in order to cause other peers to terminate the established BGP session 
as referenced in the JSA11013 advisory. 

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/2020-04-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-Invalid-BGP-UPDATE-sent-to-peer-device-may-cause-BGP-session-to-terminate-CVE-2020-1632
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a65f26a6");
  script_set_attribute(attribute:"solution", value:
"Apply the relevant Junos software release referenced in Juniper advisory JSA11013");
  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:C/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-2020-1632");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/04/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/04/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/05/25");

  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) 2020-2023 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');


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

var vuln_ranges = [
  {'min_ver':'16.1', 'fixed_ver':'16.1R7-S6'},
  {'min_ver':'16.2', 'fixed_ver':'16.2R2-S11'},
  {'min_ver':'17.1', 'fixed_ver':'17.1R2-S11'},
  {'min_ver':'17.1R3', 'fixed_ver':'17.1R3-S2'},
  {'min_ver':'17.2', 'fixed_ver':'17.2R1-S9', 'fixed_display':'17.2R1-S9, 17.2R2-S8'},
  {'min_ver':'17.2R2', 'fixed_ver':'17.2R3-S3'},
  {'min_ver':'17.2X75', 'fixed_ver':'17.2X75-D105', 'fixed_display':'17.2X75-D105, 17.2X75-D110, 17.2X75-D44'},
  {'min_ver':'17.3', 'fixed_ver':'17.3R2-S5'},
  {'min_ver':'17.3R3', 'fixed_ver':'17.3R3-S7'},
  {'min_ver':'17.4', 'fixed_ver':'17.4R2-S8', 'fixed_display':'17.4R2-S8, 17.4R3'},
  {'min_ver':'18.1', 'fixed_ver':'18.1R3-S8'},
  {'min_ver':'18.2', 'fixed_ver':'18.2R2-S6'},
  {'min_ver':'18.2R3', 'fixed_ver':'18.2R3-S2'},
  {'min_ver':'18.2X75', 'fixed_ver':'18.2X75-D12', 'fixed_display':'18.2X75-D12, 18.2X75-D33, 18.2X75-D411, 18.2X75-D420, 18.2X75-D51, 18.2X75-D60'},
  {'min_ver':'18.3', 'fixed_ver':'18.3R1-S6', 'fixed_display':'18.3R1-S6, 18.3R2-S3, 18.3R3'},
  {'min_ver':'18.4', 'fixed_ver':'18.4R1-S5', 'fixed_display':'18.4R1-S5, 18.4R2, 18.4R3'},
  {'min_ver':'19.1', 'fixed_ver':'19.1R1-S3', 'fixed_display':'19.1R1-S3, 19.1R2'},
  {'min_ver':'19.2', 'fixed_ver':'19.2R1-S2', 'fixed_display':'19.2R1-S2, 19.2R2'}
];

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);