Juniper Junos SRX MACsec Feature Secure Link Failure Silent Fallback Information Disclosure (JSA10790)

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

include("compat.inc");

if (description)
{
  script_id(102703);
  script_version("1.3");
  script_cvs_date("Date: 2018/07/12 19:01:16");

  script_cve_id("CVE-2017-2342");
  script_xref(name:"JSA", value:"JSA10790");

  script_name(english:"Juniper Junos SRX MACsec Feature Secure Link Failure Silent Fallback Information Disclosure (JSA10790)");
  script_summary(english:"Checks the Junos version, model, and configuration.");

  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 and model number, the remote
Juniper Junos device is affected by an information disclosure
vulnerability in the MACsec feature due to error reporting over an
unencrypted link when a secure link cannot be established. An adjacent
attacker can exploit this to disclose or manipulate error information.");
  script_set_attribute(attribute:"see_also", value:"https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10790");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant Junos software release referenced in Juniper
security advisory JSA10790.");
  script_set_cvss_base_vector("CVSS2#AV:A/AC:L/Au:N/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  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:"2017/07/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/07/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/08/23");

  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) 2017-2018 Tenable Network Security, Inc.");

  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");
include("misc_func.inc");

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

if (model !~ "^SRX3\d\d([^0-9]|$)")
  audit(AUDIT_HOST_NOT, 'an affected model.');

fixes = make_array();

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

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

override = TRUE;
junos_report(ver:ver, fix:fix, model:model, override:override, severity:SECURITY_WARNING);