Vulnerabilities > CVE-2019-6731 - Improper Input Validation vulnerability in Foxitsoftware Phantompdf and Reader

047910
CVSS 6.8 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
network
foxitsoftware
microsoft
CWE-20
nessus
NVD
Published: 2019-03-21
Updated: 2019-10-09

Summary

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit PhantomPDF. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the conversion of HTML files to PDF. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated object. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-7369.

Vulnerable Configurations

Part Description Count
Application
Foxitsoftware
172
OS
Microsoft
1

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 familyWindows
    NASL idFOXIT_PHANTOM_8_3_9.NASL
    descriptionAccording to its version, the Foxit PhantomPDF application (formally known as Phantom) installed on the remote Windows host is prior to 8.3.9. It is, therefore, affected by following vulnerabilities: - An out-of-bounds read/write vulnerability exists when handling certain XFA element attributes. This occurs due to improper calculation of a null-terminated character and may cause an application crash. (CVE-2018-3956) - A signature validation bypass vulnerability exists which provides incorrect results when validating certain PDF documents. (CVE-2018-18688/CVE-2018-18689) - Flaws in how PDF files are processed/handled could lead to arbitrary code execution. An attacker can exploit this by convincing a user to open a specially crafted file in order to cause the execution of arbitrary code. (CVE-2019-6728,CVE-2019-6729) Additionally, the application was affected by multiple potential information disclosure, denial of service, and remote code execution vulnerabilities.
    last seen2020-06-01
    modified2020-06-02
    plugin id121246
    published2019-01-18
    reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/121246
    titleFoxit PhantomPDF < 8.3.9 Multiple Vulnerabilities
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(121246);
  script_version("1.4");
  script_cvs_date("Date: 2019/10/31 15:18:52");

  script_cve_id(
    "CVE-2018-3956",
    "CVE-2018-18688",
    "CVE-2018-18689",
    "CVE-2019-5005",
    "CVE-2019-5006",
    "CVE-2019-5007",
    "CVE-2019-6727",
    "CVE-2019-6728",
    "CVE-2019-6729",
    "CVE-2019-6730",
    "CVE-2019-6731",
    "CVE-2019-6732",
    "CVE-2019-6733",
    "CVE-2019-6734",
    "CVE-2019-6735"
  );
  script_bugtraq_id(106798, 107496, 107552);
  script_xref(name:"ZDI", value:"ZDI-CAN-7347");
  script_xref(name:"ZDI", value:"ZDI-CAN-7452");
  script_xref(name:"ZDI", value:"ZDI-CAN-7601");
  script_xref(name:"ZDI", value:"ZDI-CAN-7353");
  script_xref(name:"ZDI", value:"ZDI-CAN-7423");
  script_xref(name:"ZDI", value:"ZDI-CAN-7368");
  script_xref(name:"ZDI", value:"ZDI-CAN-7369");
  script_xref(name:"ZDI", value:"ZDI-CAN-7453");
  script_xref(name:"ZDI", value:"ZDI-CAN-7576");
  script_xref(name:"ZDI", value:"ZDI-CAN-7355");

  script_name(english:"Foxit PhantomPDF < 8.3.9 Multiple Vulnerabilities");
  script_summary(english:"Checks the version of Foxit PhantomPDF.");

  script_set_attribute(attribute:"synopsis", value:
"A PDF toolkit installed on the remote Windows host is affected by
multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its version, the Foxit PhantomPDF application (formally
known as Phantom) installed on the remote Windows host is prior to
8.3.9. It is, therefore, affected by following vulnerabilities:

  - An out-of-bounds read/write vulnerability exists
    when handling certain XFA element attributes.
    This occurs due to improper calculation of a
    null-terminated character and may cause an application crash.
    (CVE-2018-3956)

  - A signature validation bypass vulnerability exists
    which provides incorrect results when validating
    certain PDF documents.
    (CVE-2018-18688/CVE-2018-18689)

  - Flaws in how PDF files are processed/handled could
    lead to arbitrary code execution. An attacker can 
    exploit this by convincing a user to open a specially
    crafted file in order to cause the execution of arbitrary
    code. (CVE-2019-6728,CVE-2019-6729)

Additionally, the application was affected by multiple potential 
information disclosure, denial of service, and remote code execution
vulnerabilities.");
  # https://www.foxitsoftware.com/support/security-bulletins.php
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2f244c3e");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Foxit PhantomPDF version 8.3.9 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/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:N/UI:R/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-2019-6729");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/01/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/01/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/01/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:foxitsoftware:phantom");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:foxitsoftware:phantompdf");
  script_end_attributes();

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

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

  script_dependencies("foxit_phantom_installed.nasl");
  script_require_keys("installed_sw/FoxitPhantomPDF");

  exit(0);
}

include('vcf.inc');

app = 'FoxitPhantomPDF';

app_info = vcf::get_app_info(app:app, win_local:TRUE);

constraints = [{
  'min_version' : '8.0',
  'max_version' : '8.3.8.39677',
  'fixed_version' : '8.3.9'
  }];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);
  • NASL familyWindows
    NASL idFOXIT_READER_9_4.NASL
    descriptionThe version of Foxit Reader installed on the remote Windows host is prior to 9.4. It is, therefore, affected by multiple vulnerabilities: - An out-of-bounds read/write vulnerability and crash when handling XFA element attributes. (CVE-2018-3956) - A signature validation bypass vulnerability which could lead to incorrect validation results. (CVE-2018-18688, CVE-2018-18689) - Flaws in how PDF files are processed/handled could lead to arbitrary code execution. An attacker can exploit this by convincing a user to open a specially crafted file in order to cause the execution of arbitrary code. (CVE-2019-6728,CVE-2019-6729) Additionally, the application was affected by multiple potential information disclosure, denial of service, and remote code execution vulnerabilities.
    last seen2020-06-01
    modified2020-06-02
    plugin id121046
    published2019-01-09
    reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/121046
    titleFoxit Reader < 9.4 Multiple Vulnerabilities
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(121046);
  script_version("1.6");
  script_cvs_date("Date: 2019/10/31 15:18:52");

  script_cve_id(
    "CVE-2018-3956",
    "CVE-2018-18688",
    "CVE-2018-18689",
    "CVE-2019-5005",
    "CVE-2019-5006",
    "CVE-2019-5007",
    "CVE-2019-6727",
    "CVE-2019-6728",
    "CVE-2019-6729",
    "CVE-2019-6730",
    "CVE-2019-6731",
    "CVE-2019-6732",
    "CVE-2019-6733",
    "CVE-2019-6734",
    "CVE-2019-6735"
  );
  script_bugtraq_id(106798, 107496, 107552);

  script_name(english:"Foxit Reader < 9.4 Multiple Vulnerabilities");
  script_summary(english:"Checks the version of Foxit Reader.");

  script_set_attribute(attribute:"synopsis", value:
"A PDF viewer installed on the remote Windows host is affected by
multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Foxit Reader installed on the remote Windows host is
prior to 9.4. It is, therefore, affected by multiple vulnerabilities:

  - An out-of-bounds read/write vulnerability and crash
    when handling XFA element attributes. (CVE-2018-3956)

  - A signature validation bypass vulnerability which
    could lead to incorrect validation results.
    (CVE-2018-18688, CVE-2018-18689)

  - Flaws in how PDF files are processed/handled could
    lead to arbitrary code execution. An attacker can 
    exploit this by convincing a user to open a specially
    crafted file in order to cause the execution of arbitrary
    code. (CVE-2019-6728,CVE-2019-6729)

Additionally, the application was affected by multiple potential 
information disclosure, denial of service, and remote code execution
vulnerabilities.");
  script_set_attribute(attribute:"see_also", value:"https://www.foxitsoftware.com/support/security-bulletins.php");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Foxit PhantomPDF version 9.4 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/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:N/UI:R/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-2019-6729");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/01/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/01/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/01/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:foxitsoftware:foxit_reader");
  script_end_attributes();

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

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

  script_dependencies("foxit_reader_installed.nasl");
  script_require_keys("installed_sw/Foxit Reader");

  exit(0);
}

include('vcf.inc');

app = 'Foxit Reader';

app_info = vcf::get_app_info(app:app, win_local:TRUE);

constraints = [{
  'min_version' : '9.0',
  'max_version' : '9.3.0.10826',
  'fixed_version' : '9.4'
  }];
  
vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);
  • NASL familyWindows
    NASL idFOXIT_PHANTOM_9_4.NASL
    descriptionAccording to its version, the Foxit PhantomPDF application (formally known as Phantom) installed on the remote Windows host is prior to 9.4. It is, therefore, affected by multiple vulnerabilities: - An out-of-bounds read/write vulnerability and crash when handling XFA element attributes. (CVE-2018-3956) - A signature validation bypass vulnerability which could lead to incorrect validation results. (CVE-2018-18688, CVE-2018-18689) - Flaws in how PDF files are processed/handled could lead to arbitrary code execution. An attacker can exploit this by convincing a user to open a specially crafted file in order to cause the execution of arbitrary code. (CVE-2019-6728,CVE-2019-6729) Additionally, the application was affected by multiple potential information disclosure, denial of service, and remote code execution vulnerabilities.
    last seen2020-06-01
    modified2020-06-02
    plugin id121045
    published2019-01-09
    reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/121045
    titleFoxit PhantomPDF < 9.4 Multiple Vulnerabilities
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(121045);
  script_version("1.6");
  script_cvs_date("Date: 2019/10/31 15:18:52");

  script_cve_id(
    "CVE-2018-3956",
    "CVE-2018-18688",
    "CVE-2018-18689",
    "CVE-2019-5005",
    "CVE-2019-5006",
    "CVE-2019-5007",
    "CVE-2019-6727",
    "CVE-2019-6728",
    "CVE-2019-6729",
    "CVE-2019-6730",
    "CVE-2019-6731",
    "CVE-2019-6732",
    "CVE-2019-6733",
    "CVE-2019-6734",
    "CVE-2019-6735"
  );
  script_bugtraq_id(106798, 107496, 107552);

  script_name(english:"Foxit PhantomPDF < 9.4 Multiple Vulnerabilities");
  script_summary(english:"Checks the version of Foxit PhantomPDF.");

  script_set_attribute(attribute:"synopsis", value:
"A PDF toolkit installed on the remote Windows host is affected by
a multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its version, the Foxit PhantomPDF application (formally
known as Phantom) installed on the remote Windows host is prior to
9.4. It is, therefore, affected by multiple vulnerabilities:

  - An out-of-bounds read/write vulnerability and crash
    when handling XFA element attributes. (CVE-2018-3956)

  - A signature validation bypass vulnerability which
    could lead to incorrect validation results.
    (CVE-2018-18688, CVE-2018-18689)

  - Flaws in how PDF files are processed/handled could
    lead to arbitrary code execution. An attacker can 
    exploit this by convincing a user to open a specially
    crafted file in order to cause the execution of arbitrary
    code. (CVE-2019-6728,CVE-2019-6729)

Additionally, the application was affected by multiple potential 
information disclosure, denial of service, and remote code execution
vulnerabilities.");
  script_set_attribute(attribute:"see_also", value:"https://www.foxitsoftware.com/support/security-bulletins.php");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Foxit PhantomPDF version 9.4 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/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:N/UI:R/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-2019-6729");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/01/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/01/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/01/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:foxitsoftware:phantom");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:foxitsoftware:phantompdf");
  script_end_attributes();

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

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

  script_dependencies("foxit_phantom_installed.nasl");
  script_require_keys("installed_sw/FoxitPhantomPDF");

  exit(0);
}

include('vcf.inc');

app = 'FoxitPhantomPDF';

app_info = vcf::get_app_info(app:app, win_local:TRUE);

constraints = [{
  'min_version' : '9.0',
  'max_version' : '9.3.0.10826',
  'fixed_version' : '9.4'
  }];

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

References