Vulnerabilities > CVE-2018-0021 - Unspecified vulnerability in Juniper Junos

047910
CVSS 8.8 - HIGH
Attack vector
ADJACENT_NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
low complexity
juniper
nessus
NVD
Published: 2018-04-11
Updated: 2024-11-21

Summary

If all 64 digits of the connectivity association name (CKN) key or all 32 digits of the connectivity association key (CAK) key are not configured, all remaining digits will be auto-configured to 0. Hence, Juniper devices configured with short MacSec keys are at risk to an increased likelihood that an attacker will discover the secret passphrases configured for these keys through dictionary-based and brute-force-based attacks using spoofed packets. Affected releases are Juniper Networks Junos OS: 14.1 versions prior to 14.1R10, 14.1R9; 14.1X53 versions prior to 14.1X53-D47; 15.1 versions prior to 15.1R4-S9, 15.1R6-S6, 15.1R7; 15.1X49 versions prior to 15.1X49-D100; 15.1X53 versions prior to 15.1X53-D59; 16.1 versions prior to 16.1R3-S8, 16.1R4-S8, 16.1R5; 16.2 versions prior to 16.2R1-S6, 16.2R2; 17.1 versions prior to 17.1R2.

Vulnerable Configurations

Part Description Count
OS
Juniper
61

Nessus

NASL familyJunos Local Security Checks
NASL idJUNIPER_JSA10854.NASL
descriptionAccording to its self-reported version number, the remote Junos device is affected by man-in-the-middle spoofing vulnerability.
last seen2020-06-01
modified2020-06-02
plugin id109215
published2018-04-20
reporterThis script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/109215
titleJuniper Junos Short MacSec Keys Configuration CKN / CAK Key Extension Brute-force Mitm Spoofing (JSA10854)
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(109215);
  script_version("1.2");
  script_cvs_date("Date: 2018/07/26 18:36:16");

  script_cve_id("CVE-2018-0021");
  script_xref(name:"JSA", value:"JSA10854");

  script_name(english:"Juniper Junos Short MacSec Keys Configuration CKN / CAK Key Extension Brute-force Mitm Spoofing (JSA10854)");
  script_summary(english:"Checks the Junos version and build date.");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version number, the remote Junos device
is affected by man-in-the-middle spoofing vulnerability.");
  # https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10854&actp=METADATA
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b9b88f7e");
  script_set_attribute(attribute:"solution", value:
"Apply the relevant Junos software release referenced in
Juniper advisory JSA10854.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/04/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/04/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/04/20");

  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) 2018 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("audit.inc");
include("junos_kb_cmd_func.inc");

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

fixes = make_array();

# 14.1 versions prior to 14.1R10, 14.1R9
# 14.1X53 versions prior to 14.1X53-D47
# 15.1 versions prior to 15.1R4-S9, 15.1R6-S6, 15.1R7
# 15.1X49 versions prior to 15.1X49-D100
# 15.1X53 versions prior to 15.1X53-D59
# 16.1 versions prior to 16.1R3-S8, 16.1R4-S8, 16.1R5
# 16.2 versions prior to 16.2R1-S6, 16.2R2
# 17.1 versions prior to 17.1R2

fixes['14.1'] = '14.1R9'; # or 14.1R10
fixes['14.1X53'] = '14.1X53-D47';

if (ver =~ "^15\.1R4($|[^0-9])")        fixes['15.1R'] = '15.1R4-S9';
else if (ver =~ "^15\.1R6($|[^0-9])")   fixes['15.1R'] = '15.1R6-S6';
else                                    fixes['15.1R'] = '15.1R7';

fixes['15.1X49'] = '15.1X49-D100';
fixes['15.1X53'] = '15.1X53-D59';

if (ver =~ "^16\.1R3($|[^0-9])")        fixes['16.1R'] = '16.1R3-S8';
else if (ver =~ "^16\.1R4($|[^0-9])")   fixes['16.1R'] = '16.1R4-S8';
else                                    fixes['16.1R'] = '16.1R5';

if (ver =~ "^16\.2R1($|[^0-9])")        fixes['16.2R'] = '16.2R1-S6';
else                                    fixes['16.2R'] = '16.2R2';

fixes['17.1'] = '17.1R2';

fix = check_junos(ver:ver, fixes:fixes, exit_on_fail:TRUE);

override = FALSE;

junos_report(ver:ver, fix:fix, override:override, severity:SECURITY_WARNING);

References