PowerDNS Authoritative Server 3.4.4 / 3.4.5 / 3.4.6 Process Packet Handling DoS

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

include("compat.inc");

if (description)
{
  script_id(87947);
  script_version("1.5");
  script_cvs_date("Date: 2019/11/19");

  script_cve_id("CVE-2015-5311");
  script_bugtraq_id(77522);

  script_name(english:"PowerDNS Authoritative Server 3.4.4 / 3.4.5 / 3.4.6 Process Packet Handling DoS");
  script_summary(english:"Checks the PowerDNS Authoritative Server version.");

  script_set_attribute(attribute:"synopsis", value:
"The remote name server is affected by a denial of service
vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version number, the version of the
PowerDNS Authoritative Server listening on the remote host is version
3.4.4, 3.4.5, or 3.4.6. It is, therefore, affected by a denial of
service vulnerability due to an assertion flaw that is triggered when
handling malformed packets. An unauthenticated, remote attacker can
exploit this vulnerability, via crafted query packets, to crash the
server.

Note that Nessus has not attempted to exploit this issue but has
instead relied only on the application's self-reported version number.
Also, Nessus has not checked for the presence of the patch.");
  script_set_attribute(attribute:"see_also", value:"https://doc.powerdns.com/md/security/powerdns-advisory-2015-03/");
  script_set_attribute(attribute:"solution", value:
"Upgrade to PowerDNS Authoritative Server 3.4.7 or later.
Alternatively, apply the patch referenced in the vendor advisory.");
  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_attribute(attribute:"cvss_score_source", value:"CVE-2015-5311");

  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:"2015/11/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/11/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/01/15");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:powerdns:powerdns");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:powerdns:authoritative");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"DNS");

  script_copyright(english:"This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("pdns_version.nasl");
  script_require_keys("pdns/version_full", "pdns/version_source", "pdns/type", "Settings/ParanoidReport");

  exit(0);
}

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

app_name = "PowerDNS Authoritative Server";
version_source = get_kb_item_or_exit("pdns/version_source");
version = get_kb_item_or_exit("pdns/version_full");

fix = '3.4.7';
port = 53;

# Only the Authoritative Server is affected
type = get_kb_item_or_exit("pdns/type");
if (type != 'authoritative server') audit(AUDIT_NOT_LISTEN, app_name, port, "UDP");

if (version == UNKNOWN_VER) audit(AUDIT_UNKNOWN_APP_VER, app_name);
if (report_paranoia < 2) audit(AUDIT_PARANOID);

if (version !~ "^3\.4\.[4-6]([^0-9]|$)")
  audit(AUDIT_LISTEN_NOT_VULN, app_name, port, version, "UDP");


if (report_verbosity > 0)
{
  report =
    '\n  Version source    : ' + version_source +
    '\n  Installed version : ' + version +
    '\n  Fixed version     : ' + fix +
    '\n';
  security_warning(port:port, proto:"udp", extra:report);
}
else security_warning(port:port, proto:"udp");