Juniper Junos Corrupt pam.conf Security Bypass (JSA10707)

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

include("compat.inc");

if (description)
{
  script_id(86608);
  script_version("1.8");
  script_cvs_date("Date: 2018/07/12 19:01:16");

  script_cve_id("CVE-2015-7751");
  script_xref(name:"JSA", value:"JSA10707");

  script_name(english:"Juniper Junos Corrupt pam.conf Security Bypass (JSA10707)");
  script_summary(english:"Checks the Junos version.");

  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 Juniper
Junos device is affected by a security bypass vulnerability due to the
'fail-open' behavior of the pam.conf file. A local attacker can
exploit this, by modifying or corrupting the pam.conf file, to gain
unauthenticated root access to the device.");
  script_set_attribute(attribute:"see_also", value:"https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10707");
  script_set_attribute(attribute:"solution", value:
"Apply the relevant Junos software release referenced in Juniper
advisory JSA10707.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:C/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:"2015/10/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/10/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/10/26");

  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) 2015-2018 Tenable Network Security, Inc.");

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

  exit(0);
}

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

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

fixes = make_array();
fixes['12.1X44'] = '12.1X44-D50';
fixes['12.1X46'] = '12.1X46-D35';
fixes['12.1X47'] = '12.1X47-D25';
fixes['12.3X48'] = '12.3X48-D15';
fixes['12.2'   ] = '12.3R7';
fixes['12.3'   ] = '12.3R9';
fixes['12.3X48'] = '12.3X48-D15';
fixes['13.2'   ] = '13.2R7';
fixes['13.2X51'] = '13.2X51-D35';
fixes['13.3'   ] = '13.3R6';
fixes['14.1'   ] = '14.1R5';
fixes['14.1X50'] = '14.1X50-D105';
fixes['14.1X51'] = '14.1X51-D70';
fixes['14.1X53'] = '14.1X53-D25';
fixes['14.1X55'] = '14.1X55-D20';
fixes['15.1R'  ] = '15.1R1';
fixes['15.1F'  ] = '15.1F2';
fixes['15.1X49'] = '15.1X49-D10';

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

if (report_verbosity > 0)
{
  report = get_report(ver:ver, fix:fix);
  security_warning(port:0, extra:report);
}
else security_warning(0);