Vulnerabilities > CVE-2019-1620 - Path Traversal vulnerability in Cisco Data Center Network Manager 11.0(1)

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
cisco
CWE-22
critical
nessus
exploit available
metasploit
NVD
Published: 2019-06-27
Updated: 2020-10-06

Summary

A vulnerability in the web-based management interface of Cisco Data Center Network Manager (DCNM) could allow an unauthenticated, remote attacker to upload arbitrary files on an affected device. The vulnerability is due to incorrect permission settings in affected DCNM software. An attacker could exploit this vulnerability by uploading specially crafted data to the affected device. A successful exploit could allow the attacker to write arbitrary files on the filesystem and execute code with root privileges on the affected device.

Vulnerable Configurations

Part Description Count
Application
Cisco
1

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Relative Path Traversal
    An attacker exploits a weakness in input validation on the target by supplying a specially constructed path utilizing dot and slash characters for the purpose of obtaining access to arbitrary files or resources. An attacker modifies a known path on the target in order to reach material that is not available through intended channels. These attacks normally involve adding additional path separators (/ or \) and/or dots (.), or encodings thereof, in various combinations in order to reach parent directories or entirely separate trees of the target's directory structure.
  • Directory Traversal
    An attacker with access to file system resources, either directly or via application logic, will use various file path specification or navigation mechanisms such as ".." in path strings and absolute paths to extend their range of access to inappropriate areas of the file system. The attacker attempts to either explore the file system for recon purposes or access directories and files that are intended to be restricted from their access. Exploring the file system can be achieved through constructing paths presented to directory listing programs, such as "ls" and 'dir', or through specially crafted programs that attempt to explore the file system. The attacker engaging in this type of activity is searching for information that can be used later in a more exploitive attack. Access to restricted directories or files can be achieved through modification of path references utilized by system applications.
  • 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.
  • Using Slashes and URL Encoding Combined to Bypass Validation Logic
    This attack targets the encoding of the URL combined with the encoding of the slash characters. An attacker can take advantage of the multiple way of encoding an URL and abuse the interpretation of the URL. An URL may contain special character that need special syntax handling in order to be interpreted. Special characters are represented using a percentage character followed by two digits representing the octet code of the original character (%HEX-CODE). For instance US-ASCII space character would be represented with %20. This is often referred as escaped ending or percent-encoding. Since the server decodes the URL from the requests, it may restrict the access to some URL paths by validating and filtering out the URL requests it received. An attacker will try to craft an URL with a sequence of special characters which once interpreted by the server will be equivalent to a forbidden URL. It can be difficult to protect against this attack since the URL can contain other format of encoding such as UTF-8 encoding, Unicode-encoding, etc.
  • Manipulating Input to File System Calls
    An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.

Exploit-Db

idEDB-ID:47347
last seen2019-09-03
modified2019-09-03
published2019-09-03
reporterExploit-DB
sourcehttps://www.exploit-db.com/download/47347
titleCisco Data Center Network Manager - Unauthenticated Remote Code Execution (Metasploit)

Metasploit

descriptionDCNM exposes a file upload servlet (FileUploadServlet) at /fm/fileUpload. An authenticated user can abuse this servlet to upload a WAR to the Apache Tomcat webapps directory and achieve remote code execution as root. This module exploits two other vulnerabilities, CVE-2019-1619 for authentication bypass on versions 10.4(2) and below, and CVE-2019-1622 (information disclosure) to obtain the correct directory for the WAR file upload. This module was tested on the DCNM Linux virtual appliance 10.4(2), 11.0(1) and 11.1(1), and should work on a few versions below 10.4(2). Only version 11.0(1) requires authentication to exploit (see References to understand why).
idMSF:EXPLOIT/MULTI/HTTP/CISCO_DCNM_UPLOAD_2019
last seen2020-06-11
modified2020-03-12
published2019-07-12
references
reporterRapid7
sourcehttps://github.com/rapid7/metasploit-framework/blob/master//modules/exploits/multi/http/cisco_dcnm_upload_2019.rb
titleCisco Data Center Network Manager Unauthenticated Remote Code Execution

Nessus

NASL familyCISCO
NASL idCISCO-SA-20190626-DCNM-CODEX.NASL
descriptionAccording to its self-reported version, Cisco Data Center Network Manager is affected by a vulnerability in the web-based management interface. An attacker could exploit this vulnerability by uploading specially crafted data to the affected device. A successful exploit could allow the attacker to write arbitrary files on the filesystem and execute code with root privileges on the affected device. Please see the included Cisco BIDs and Cisco Security Advisory for more information
last seen2020-06-01
modified2020-06-02
plugin id126640
published2019-07-12
reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/126640
titleCisco Data Center Network Manager Arbitrary File Upload and Remote Code Execution Vulnerability
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(126640);
  script_version("1.4");
  script_cvs_date("Date: 2019/09/24 11:01:32");

  script_cve_id("CVE-2019-1620");
  script_bugtraq_id(108906);
  script_xref(name:"CISCO-BUG-ID", value:"CSCvo64647");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20190626-dcnm-codex");
  script_xref(name:"IAVA", value:"2019-A-0221");

  script_name(english:"Cisco Data Center Network Manager Arbitrary File Upload and Remote Code Execution Vulnerability");
  script_summary(english:"Checks the version of Cisco Data Center Network Manager");

  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, Cisco Data Center Network Manager is affected by a vulnerability in the 
web-based management interface. An attacker could exploit this vulnerability by uploading specially crafted data to 
the affected device. A successful exploit could allow the attacker to write arbitrary files on the filesystem and 
execute code with root privileges on the affected device.

Please see the included Cisco BIDs and Cisco Security Advisory for more information");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190626-dcnm-codex
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a925f36f");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo64647");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Cisco Prime Data Center Network Manager version 11.2(1) or later.");
  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:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-1620");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Cisco Data Center Network Manager Unauthenticated Remote Code Execution');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
  script_cwe_id(264);

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/06/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/06/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/07/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:data_center_network_manager");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

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

  script_dependencies("cisco_prime_dcnm_installed_win.nasl", "cisco_prime_dcnm_installed_linux.nasl");
  script_require_keys("installed_sw/Cisco Prime DCNM");

  exit(0);
}

include('global_settings.inc');
include('misc_func.inc');
include('vcf.inc');

app = 'Cisco Prime DCNM';

get_install_count(app_name:app, exit_if_zero:TRUE);

app_info = vcf::get_app_info(app:app);
vcf::check_granularity(app_info:app_info, sig_segments:3);

constraints = [
  { 'fixed_version' : '11.2.1.0', 'fixed_display' : '11.2(1)' }
];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);

Packetstorm

References