Juniper Junos Proxy ARP DoS (PSN-2013-04-913)

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

include("compat.inc");

if (description)
{
  script_id(66511);
  script_version("1.9");
  script_cvs_date("Date: 2018/08/07 16:46:50");

  script_bugtraq_id(60017);

  script_name(english:"Juniper Junos Proxy ARP DoS (PSN-2013-04-913)");
  script_summary(english:"Checks 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
has a denial of service vulnerability.  When Proxy ARP is enabled,
specially crafted ARP packets can trigger a kernel crash.  A remote,
unauthenticated attacker could exploit this to crash the host."
  );
  # http://www.juniper.net/alerts/viewalert.jsp?actionBtn=Search&txtAlertNumber=PSN-2013-04-913&viewMode=view
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?92b8374b");
  script_set_attribute(
    attribute:"solution",
    value:
"Apply the relevant Junos upgrade referenced in Juniper advisory
PSN-2013-04-913."
  );
  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_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:"2013/04/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2013/04/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/05/20");

  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) 2013-2018 Tenable Network Security, Inc.");

  script_dependencies("junos_version.nasl");
  script_require_keys("Host/Juniper/JUNOS/Version", "Host/Juniper/JUNOS/BuildDate");

  exit(0);
}

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

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

if (compare_build_dates(build_date, '2013-02-28') >= 0)
  audit(AUDIT_INST_VER_NOT_VULN, 'Junos', ver + ' (build date ' + build_date + ')');

# This issue was introduced as a regression and only affects the following versions of Junos:
# 10.4R11-10.4R12, 11.4R5-11.4R6, 12.1R3-12.1R4
if (ver == '10.4R11' || ver == '10.4R12')
  fix = '10.4R13';
else if (ver == '11.4R5' || ver == '11.4R6')
  fix = '11.4R7';
else if (ver == '12.1R3' || ver == '12.1R4')
  fix = '12.1R5 or 12.1X44-D10';
else
  audit(AUDIT_INST_VER_NOT_VULN, 'Junos', ver);

if (report_verbosity > 0)
{
  report =
    '\n  Installed version : ' + ver +
    '\n  Fixed version     : ' + fix + '\n';
  security_hole(port:0, extra:report);
}
else security_hole(0);