Vulnerabilities > CVE-2019-1821 - Improper Input Validation vulnerability in Cisco products

047910
CVSS 10.0 - CRITICAL
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
COMPLETE
Integrity impact
COMPLETE
Availability impact
COMPLETE
network
low complexity
cisco
CWE-20
critical
nessus
exploit available
metasploit

Summary

A vulnerability in the web-based management interface of Cisco Prime Infrastructure (PI) and Cisco Evolved Programmable Network (EPN) Manager could allow an authenticated, remote attacker to execute code with root-level privileges on the underlying operating system. This vulnerability exist because the software improperly validates user-supplied input. An attacker could exploit this vulnerability by uploading a malicious file to the administrative web interface. A successful exploit could allow the attacker to execute code with root-level privileges on the underlying operating system.

Vulnerable Configurations

Part Description Count
Application
Cisco
73

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Server Side Include (SSI) Injection
    An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
  • Cross Zone Scripting
    An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
  • Cross Site Scripting through Log Files
    An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
  • Command Line Execution through SQL Injection
    An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.

Exploit-Db

  • idEDB-ID:47016
    last seen2019-06-21
    modified2019-06-20
    published2019-06-20
    reporterExploit-DB
    sourcehttps://www.exploit-db.com/download/47016
    titleCisco Prime Infrastructure Health Monitor - TarArchive Directory Traversal (Metasploit)
  • idEDB-ID:47686
    last seen2019-11-19
    modified2019-05-17
    published2019-05-17
    reporterExploit-DB
    sourcehttps://www.exploit-db.com/download/47686
    titleCisco Prime Infrastructure Health Monitor HA TarArchive - Directory Traversal / Remote Code Execution

Metasploit

descriptionThis module exploits a vulnerability found in Cisco Prime Infrastructure. The issue is that the TarArchive Java class the HA Health Monitor component uses does not check for any directory traversals while unpacking a Tar file, which can be abused by a remote user to leverage the UploadServlet class to upload a JSP payload to the Apache Tomcat's web apps directory, and gain arbitrary remote code execution. Note that authentication is not required to exploit this vulnerability.
idMSF:EXPLOIT/LINUX/HTTP/CPI_TARARCHIVE_UPLOAD
last seen2020-06-14
modified2019-06-18
published2019-06-07
references
reporterRapid7
sourcehttps://github.com/rapid7/metasploit-framework/blob/master//modules/exploits/linux/http/cpi_tararchive_upload.rb
titleCisco Prime Infrastructure Health Monitor TarArchive Directory Traversal Vulnerability

Nessus

NASL familyCISCO
NASL idCISCO_PRIME_INFRASTRUCTURE_SA-20190515-PI-RCE.NASL
descriptionThe Cisco Prime Infrastructure application running on the remote host is affected by the following vulnerabilities : - An unspecified flaw exists that allows a remote, unauthenticated attacker to execute arbitrary code. (CVE-2019-1821) - An unspecified flaw exists that allows a remote, authenticated attacker to execute arbitrary code. (CVE-2019-1822, CVE-2019-1823)
last seen2020-06-01
modified2020-06-02
plugin id130503
published2019-11-05
reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/130503
titleCisco Prime Infrastructure Multiple Vulnerabilities (cisco-sa-20190515-pi-rce)
code
#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");

if (description)
{
  script_id(130503);
  script_version("1.2");
  script_cvs_date("Date: 2019/11/08");

  script_cve_id("CVE-2019-1821", "CVE-2019-1822", "CVE-2019-1823");
  script_bugtraq_id(108339);
  script_xref(name:"CISCO-BUG-ID", value:"CSCvo22842");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvo28671");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvo28680");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvo62258");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvo62264");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvo62280");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20190515-pi-rce");

  script_name(english:"Cisco Prime Infrastructure Multiple Vulnerabilities (cisco-sa-20190515-pi-rce)");
  script_summary(english:"Checks the Cisco Prime Infrastructure version.");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch.");
  script_set_attribute(attribute:"description", value:
"The Cisco Prime Infrastructure application running on the remote
host is affected by the following vulnerabilities :

  - An unspecified flaw exists that allows a remote,
    unauthenticated attacker to execute arbitrary code.
    (CVE-2019-1821)

  - An unspecified flaw exists that allows a remote,
    authenticated attacker to execute arbitrary code.
    (CVE-2019-1822, CVE-2019-1823)");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-pi-rce
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ce4c9325");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo22842");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo28671");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo28680");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo62258");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo62264");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo62280");
  script_set_attribute(attribute:"solution", value:
"Upgrade Cisco Prime Infrastructure to version 3.4.1 Update 01, 3.5.0
Update 03, 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-2019-1821");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Cisco Prime Infrastructure Health Monitor TarArchive Directory Traversal Vulnerability');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/05/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/05/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/11/05");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:prime_infrastructure");
  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_infrastructure_detect.nbin");
  script_require_keys("installed_sw/Prime Infrastructure");
  script_require_ports("Services/www", 443);

  exit(0);
}

include('vcf.inc');
include('http.inc');

port = get_http_port(default:443);
app_info = vcf::get_app_info(app:'Prime Infrastructure', port:port, webapp:TRUE);

constraints = [
  {'min_version':'3.4', 'fixed_version':'3.4.1.1', 'fixed_display':'3.4.1 Update 01 / 3.6'},
  {'min_version':'3.5', 'fixed_version':'3.5.0.3', 'fixed_display':'3.5.0 Update 03 / 3.6'}
];

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

Packetstorm

data sourcehttps://packetstormsecurity.com/files/download/153350/cpi_tararchive_upload.rb.txt
idPACKETSTORM:153350
last seen2019-06-20
published2019-06-19
reportermr_me
sourcehttps://packetstormsecurity.com/files/153350/Cisco-Prime-Infrastructure-Health-Monitor-TarArchive-Directory-Traversal.html
titleCisco Prime Infrastructure Health Monitor TarArchive Directory Traversal

Saint

bid108339
descriptionCisco Prime Infrastructure Health Monitor tar file directory traversal
idnet_cisco_primeinfrastructure
titlecisco_prime_infrastructure_health_monitor_tar
typeremote