AIX NTP v3 Advisory : ntp_advisory7.asc (IV87614) (IV87419) (IV87615) (IV87420) (IV87939)

2017-08-03T00:00:00
ID AIX_NTP_V3_ADVISORY7.NASL
Type nessus
Reporter Tenable
Modified 2018-07-17T00:00:00

Description

The version of NTP installed on the remote AIX host is affected by the following vulnerabilities :

  • A time serving flaw exists in the trusted key system due to improper key checks. An authenticated, remote attacker can exploit this to perform impersonation attacks between authenticated peers. (CVE-2015-7974)

  • An information disclosure vulnerability exists in the message authentication functionality in libntp that is triggered during the handling of a series of specially crafted messages. An adjacent attacker can exploit this to partially recover the message digest key. (CVE-2016-1550)

  • A flaw exists due to improper filtering of IPv4 'bogon' packets received from a network. An unauthenticated, remote attacker can exploit this to spoof packets to appear to come from a specific reference clock. (CVE-2016-1551)

  • A denial of service vulnerability exists that allows an authenticated, remote attacker to manipulate the value of the trustedkey, controlkey, or requestkey via a crafted packet, preventing authentication with ntpd until the daemon has been restarted. (CVE-2016-2517)

  • An out-of-bounds read error exists in the MATCH_ASSOC() function that occurs during the creation of peer associations with hmode greater than 7. An authenticated, remote attacker can exploit this, via a specially crafted packet, to cause a denial of service. (CVE-2016-2518)

  • An overflow condition exists in the ctl_getitem() function in ntpd due to improper validation of user-supplied input when reporting return values. An authenticated, remote attacker can exploit this to cause ntpd to abort. (CVE-2016-2519)

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

include("compat.inc");

if (description)
{
  script_id(102128);
  script_version("3.8");
  script_cvs_date("Date: 2018/07/17 12:00:06");

  script_cve_id(
    "CVE-2015-7974",
    "CVE-2016-1550",
    "CVE-2016-1551",
    "CVE-2016-2517",
    "CVE-2016-2518",
    "CVE-2016-2519"
  );
  script_bugtraq_id(
    81960,
    88189,
    88204,
    88219,
    88226,
    88261
  );
  script_xref(name:"CERT", value:"718152");

  script_name(english:"AIX NTP v3 Advisory : ntp_advisory7.asc (IV87614) (IV87419) (IV87615) (IV87420) (IV87939)");
  script_summary(english:"Checks the version of the ntp packages.");

  script_set_attribute(attribute:"synopsis", value:
"The remote AIX host has a version of NTP installed that is affected
by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of NTP installed on the remote AIX host is affected by
the following vulnerabilities :

  - A time serving flaw exists in the trusted key system
    due to improper key checks. An authenticated, remote
    attacker can exploit this to perform impersonation
    attacks between authenticated peers. (CVE-2015-7974)

  - An information disclosure vulnerability exists in the
    message authentication functionality in libntp that is
    triggered during the handling of a series of specially
    crafted messages. An adjacent attacker can exploit this
    to partially recover the message digest key.
    (CVE-2016-1550)

  - A flaw exists due to improper filtering of IPv4 'bogon'
    packets received from a network. An unauthenticated,
    remote attacker can exploit this to spoof packets to
    appear to come from a specific reference clock.
    (CVE-2016-1551)

  - A denial of service vulnerability exists that allows an
    authenticated, remote attacker to manipulate the value
    of the trustedkey, controlkey, or requestkey via a
    crafted packet, preventing authentication with ntpd
    until the daemon has been restarted. (CVE-2016-2517)

  - An out-of-bounds read error exists in the MATCH_ASSOC()
    function that occurs during the creation of peer
    associations with hmode greater than 7. An
    authenticated, remote attacker can exploit this, via a
    specially crafted packet, to cause a denial of service.
    (CVE-2016-2518)

  - An overflow condition exists in the ctl_getitem()
    function in ntpd due to improper validation of
    user-supplied input when reporting return values. An
    authenticated, remote attacker can exploit this to cause
    ntpd to abort. (CVE-2016-2519)");
  script_set_attribute(attribute:"see_also", value:"http://aix.software.ibm.com/aix/efixes/security/ntp_advisory7.asc");
  script_set_attribute(attribute:"solution", value:
"A fix is available and can be downloaded from the IBM AIX website.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  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:U/C:N/I:N/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/12/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/09/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/08/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:ibm:aix");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:ntp:ntp");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"AIX Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2017-2018 Tenable Network Security, Inc.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/AIX/lslpp", "Host/local_checks_enabled", "Host/AIX/version");

  exit(0);
}

include("aix.inc");
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");

if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
oslevel = get_kb_item("Host/AIX/version");
if (isnull(oslevel)) audit(AUDIT_UNKNOWN_APP_VER, "AIX");
oslevel = oslevel - "AIX-";

oslevelcomplete = chomp(get_kb_item("Host/AIX/oslevelsp"));
if (isnull(oslevelcomplete)) audit(AUDIT_UNKNOWN_APP_VER, "AIX");
oslevelparts = split(oslevelcomplete, sep:'-', keep:0);
if ( max_index(oslevelparts) != 4 ) audit(AUDIT_UNKNOWN_APP_VER, "AIX");
ml = oslevelparts[1];
sp = oslevelparts[2];

if ( ! get_kb_item("Host/AIX/lslpp") ) audit(AUDIT_PACKAGE_LIST_MISSING);

if ( get_kb_item("Host/AIX/emgr_failure" ) ) exit(0, "This AIX package check is disabled because : "+get_kb_item("Host/AIX/emgr_failure") );

flag = 0;

aix_ntp_vulns = {
  "5.3": {
    "12": {
      "09": {
        "bos.net.tcp.client": {
          "minfilesetver":"5.3.12.0",
          "maxfilesetver":"5.3.12.10",
          "patch":"(IV87614m9a|IV92194m9a|IV96305m9a)"
        }
      }
    }
  },
  "6.1": {
    "09": {
      "05": {
        "bos.net.tcp.client": {
          "minfilesetver":"6.1.9.0",
          "maxfilesetver":"6.1.9.102",
          "patch":"(IV87419m5d)"
        }
      },
      "06": {
        "bos.net.tcp.client": {
          "minfilesetver":"6.1.9.0",
          "maxfilesetver":"6.1.9.102",
          "patch":"(IV87419m6a|IV91803m6a)"
        }
      },
      "07": {
        "bos.net.tcp.client": {
          "minfilesetver":"6.1.9.0",
          "maxfilesetver":"6.1.9.102",
          "patch":"(IV87419m7a|IV91803m6a|IV96306m9a)"
        }
      }
    }
  },
  "7.1": {
    "03": {
      "05": {
        "bos.net.tcp.client": {
          "minfilesetver":"7.1.3.0",
          "maxfilesetver":"7.1.3.45",
          "patch":"(IV87615m5a|IV92193m5a)"
        }
      },
      "06": {
        "bos.net.tcp.client": {
          "minfilesetver":"7.1.3.0",
          "maxfilesetver":"7.1.3.46",
          "patch":"(IV87615m6a|IV92193m5a)"
        }
      },
      "07": {
        "bos.net.tcp.client": {
          "minfilesetver":"7.1.3.0",
          "maxfilesetver":"7.1.3.47",
          "patch":"(IV87615m7a|IV92193m5a|IV96307m9a)"
        }
      }
    },
    "04": {
      "00": {
        "bos.net.tcp.client": {
          "minfilesetver":"7.1.4.0",
          "maxfilesetver":"7.1.4.1",
          "patch":"(IV87420m0a)"
        }
      },
      "01": {
        "bos.net.tcp.client": {
          "minfilesetver":"7.1.4.0",
          "maxfilesetver":"7.1.4.1",
          "patch":"(IV87420m0a|IV91951m3a)"
        }
      },
      "02": {
        "bos.net.tcp.client": {
          "minfilesetver":"7.1.4.0",
          "maxfilesetver":"7.1.4.1",
          "patch":"(IV87420m2a|IV91951m3a|IV96308m4a)"
        }
      }
    }
  },
  "7.2": {
   "00": {
      "00": {
        "bos.net.tcp.ntp": {
          "minfilesetver":"7.2.0.0",
          "maxfilesetver":"7.2.0.2",
          "patch":"(IV87939m0b|IV92192m2a)"
        },
        "bos.net.tcp.ntpd": {
          "minfilesetver":"7.2.0.0",
          "maxfilesetver":"7.2.0.2",
          "patch":"(IV87939m0b|IV92192m2a)"
        }
      },
      "01": {
        "bos.net.tcp.ntp": {
          "minfilesetver":"7.2.0.0",
          "maxfilesetver":"7.2.0.2",
          "patch":"(IV87939m0b|IV92192m2a)"
        },
        "bos.net.tcp.ntpd": {
          "minfilesetver":"7.2.0.0",
          "maxfilesetver":"7.2.0.2",
          "patch":"(IV87939m0b|IV92192m2a)"
        }
      },
      "02": {
        "bos.net.tcp.ntp": {
          "minfilesetver":"7.2.0.0",
          "maxfilesetver":"7.2.0.2",
          "patch":"(IV87939m2a|IV92192m2a|IV96309m4a)"
        },
        "bos.net.tcp.ntpd": {
          "minfilesetver":"7.2.0.0",
          "maxfilesetver":"7.2.0.2",
          "patch":"(IV87939m2a|IV92192m2a|IV96309m4a)"
        }
      }
    }
  }
};

version_report = "AIX " + oslevel;
if ( empty_or_null(aix_ntp_vulns[oslevel]) ) {
  os_options = join( sort( keys(aix_ntp_vulns) ), sep:' / ' );
  audit(AUDIT_OS_NOT, os_options, version_report);
}

version_report = version_report + " ML " + ml;
if ( empty_or_null(aix_ntp_vulns[oslevel][ml]) ) {
  ml_options = join( sort( keys(aix_ntp_vulns[oslevel]) ), sep:' / ' );
  audit(AUDIT_OS_NOT, "ML " + ml_options, version_report);
}

version_report = version_report + " SP " + sp;
if ( empty_or_null(aix_ntp_vulns[oslevel][ml][sp]) ) {
  sp_options = join( sort( keys(aix_ntp_vulns[oslevel][ml]) ), sep:' / ' );
  audit(AUDIT_OS_NOT, "SP " + sp_options, version_report);
}

foreach package ( keys(aix_ntp_vulns[oslevel][ml][sp]) ) {
  package_info = aix_ntp_vulns[oslevel][ml][sp][package];
  minfilesetver = package_info["minfilesetver"];
  maxfilesetver = package_info["maxfilesetver"];
  patch =         package_info["patch"];
  if (aix_check_ifix(release:oslevel, ml:ml, sp:sp, patch:patch, package:package, minfilesetver:minfilesetver, maxfilesetver:maxfilesetver) < 0) flag++;
}

if (flag)
{
  aix_report_extra = ereg_replace(string:aix_report_get(), pattern:"[()]", replace:"");
  aix_report_extra = ereg_replace(string:aix_report_extra, pattern:"[|]", replace:" or ");
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : aix_report_extra
  );
}
else
{
  tested = aix_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "bos.net.tcp.ntp / bos.net.tcp.ntpd / bos.net.tcp.client");
}