Vulnerabilities > CVE-2019-15288 - Improper Input Validation vulnerability in Cisco products

047910
CVSS 8.8 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
LOW
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
network
low complexity
cisco
CWE-20
nessus
NVD
Published: 2019-11-26
Updated: 2024-11-21

Summary

A vulnerability in the CLI of Cisco TelePresence Collaboration Endpoint (CE), Cisco TelePresence Codec (TC), and Cisco RoomOS Software could allow an authenticated, remote attacker to escalate privileges to an unrestricted user of the restricted shell. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by including specific arguments when opening an SSH connection to an affected device. A successful exploit could allow the attacker to gain unrestricted user access to the restricted shell of an affected device.

Vulnerable Configurations

Part Description Count
Application
Cisco
32
OS
Cisco
28

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.

Nessus

  • NASL familyCISCO
    NASL idCISCO-SA-TELEPRESENCE-PATH-TR-WDRNYEZZ.NASL
    descriptionAccording to its self-reported version, the Cisco TelePresence Codec (TC) and Collaboration Endpoint (CE) Cisco TelePresence Software is affected by a directory traversal vulnerability. An authenticated, remote attacker can exploit this vulnerability in order to read and write arbitrary files on the remote host. Please see the included Cisco BIDs and Cisco Security Advisory for more information
    last seen2020-03-17
    modified2020-02-07
    plugin id133530
    published2020-02-07
    reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/133530
    titleCisco TelePresence Endpoint Software Path Traversal (cisco-sa-telepresence-path-tr-wdrnYEZZ)
    code
    #
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(133530);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/02/07");

  script_cve_id("CVE-2020-3143");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvs45241");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvs67675");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvs67680");
  script_xref(name:"CISCO-SA", value:"cisco-sa-telepresence-path-tr-wdrnYEZZ");
  script_xref(name:"IAVA", value:"2020-A-0055");

  script_name(english:"Cisco TelePresence Endpoint Software Path Traversal (cisco-sa-telepresence-path-tr-wdrnYEZZ)");
  script_summary(english:"Checks the version of Cisco TelePresence Software");

  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, the Cisco TelePresence Codec (TC) and Collaboration Endpoint (CE) Cisco
TelePresence Software is affected by a directory traversal vulnerability. An authenticated, remote attacker can exploit
this vulnerability in order to read and write arbitrary files on the remote host.

Please see the included Cisco BIDs and Cisco Security Advisory for more information");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-telepresence-path-tr-wdrnYEZZ
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?86cc9a48");
  # https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvs45241
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6b7ec8f6");
  # https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvs67675
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?075eccb8");
  # https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvs67680
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2c33b8fc");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvs67675 or CSCvs45241 and CSCvs67680");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  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:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-15288");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/01/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/01/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/02/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:telepresence_tc_software");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:telepresence_ce");
  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) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("cisco_telepresence_mcu_detect.nasl");
  script_require_keys("Cisco/TelePresence_MCU/Device", "Cisco/TelePresence_MCU/Version");

  exit(0);
}

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

app_name = 'Cisco TelePresence TC/CE software';
version = get_kb_item_or_exit('Cisco/TelePresence_MCU/Version');
bugid = '';

short_version = pregmatch(pattern: "^(TC|ce)(\d+(?:\.\d+){0,2})", string:version);
if (isnull(short_version))
  audit(AUDIT_NOT_DETECT, app_name);
else
{
  short_type = short_version[1];
  short_num = short_version[2];
}

fix = '';

if (short_type == 'TC'){
    fix = '7.3.20';
    bugid = 'CSCvs67675';
}
else if (short_type == 'ce'){
  bugid = 'CSCvs45241, CSCvs67680';
  if (short_num =~ "^8\.")
    fix = '8.3.8';
  else if (short_num =~ "^9\.[0-8]($|[^0-9])")
    fix = '9.8.3';
  else if (short_num =~ "^9\.9")
    fix = '9.9.2';
}
else audit(AUDIT_NOT_DETECT, app_name);

if (!empty_or_null(fix) && ver_compare(ver:short_num, fix:fix, strict:FALSE) < 0)
{
  report = '\n  Installed Version : ' + version +
           '\n  Cisco Bug ID      : ' + bugid +
           '\n';

  security_report_v4(port:0, severity:SECURITY_HOLE, extra:report);
}
else audit(AUDIT_INST_VER_NOT_VULN, app_name, version);
  • NASL familyCISCO
    NASL idCISCO-SA-20191106-TELEPRES-ROOMOS-PRIVESC.NASL
    descriptionAccording to its self-reported version, the Cisco TelePresence Codec (TC) and Collaboration Endpoint (CE) Cisco TelePresence Software is affected by software privilege escalation vulnerability. An authenticated, remote attacker to escalate privileges to an unrestricted user of the restricted shell. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by including specific arguments when opening an SSH connection to an affected device. A successful exploit could allow the attacker to gain unrestricted user access to the restricted shell of an affected device. Please see the included Cisco BIDs and Cisco Security Advisory for more information
    last seen2020-06-01
    modified2020-06-02
    plugin id131076
    published2019-11-15
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/131076
    titleCisco TelePresence Endpoint Software Privilege Escalation Vulnerability
    code
    #
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(131076);
  script_version("1.4");
  script_cvs_date("Date: 2020/02/06");

  script_cve_id("CVE-2019-15288");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvq29901");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20191106-telepres-roomos-privesc");

  script_name(english:"Cisco TelePresence Endpoint Software Privilege Escalation Vulnerability");
  script_summary(english:"Checks the version of Cisco TelePresence Software");

  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, the Cisco TelePresence Codec (TC) and Collaboration Endpoint (CE) Cisco
TelePresence Software is affected by software privilege escalation vulnerability. An authenticated, remote attacker to
escalate privileges to an unrestricted user of the restricted shell. The vulnerability is due to insufficient input
validation. An attacker could exploit this vulnerability by including specific arguments when opening an SSH connection
to an affected device. A successful exploit could allow the attacker to gain unrestricted user access to the restricted
shell of an 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-20191106-telepres-roomos-privesc
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a19c9b87");
  # https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvq29901
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?42c440f9");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvq29901");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/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:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-15288");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(20);

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/11/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/11/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/11/15");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:telepresence_tc_software");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:telepresence_ce");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("cisco_telepresence_mcu_detect.nasl");
  script_require_keys("Cisco/TelePresence_MCU/Device", "Cisco/TelePresence_MCU/Version");

  exit(0);
}

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

app_name = 'Cisco TelePresence TC/CE software';
version = get_kb_item_or_exit('Cisco/TelePresence_MCU/Version');

short_version = pregmatch(pattern: "^(TC|ce)(\d+(?:\.\d+){0,2})", string:version);
if (isnull(short_version))
  audit(AUDIT_NOT_DETECT, app_name);
else
{
  short_type = short_version[1];
  short_num = short_version[2];
}

fix = '';

if (short_type == 'TC'){
    fix = '7.3.19';
}
else if (short_type == 'ce'){
    fix = '9.8.1';
}
else audit(AUDIT_NOT_DETECT, app_name);

if (!empty_or_null(fix) && ver_compare(ver:short_num, fix:fix, strict:FALSE) < 0)
{
  report = '\n  Installed Version : ' + version +
           '\n  Cisco Bug ID      : CSCvq29901' +
           '\n';

  security_report_v4(port:0, severity:SECURITY_WARNING, extra:report);
}
else audit(AUDIT_INST_VER_NOT_VULN, app_name, version);

References