Vulnerabilities > CVE-2017-1519 - Improper Input Validation vulnerability in IBM DB2 and DB2 Connect

047910
CVSS 5.9 - MEDIUM
Attack vector
NETWORK
Attack complexity
HIGH
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
HIGH
network
high complexity
ibm
CWE-20
nessus
NVD
Published: 2017-09-12
Updated: 2017-09-15

Summary

IBM DB2 10.5 and 11.1 contains a denial of service vulnerability. A remote user can cause disruption of service for DB2 Connect Server setup with a particular configuration. IBM X-Force ID: 129829.

Vulnerable Configurations

Part Description Count
Application
Ibm
19
OS
Linux
1
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 familyDatabases
    NASL idDB2_1112FP2_36792_NIX.NASL
    descriptionAccording to its version, the installation of IBM DB2 running on the remote host is either 9.7 prior to fix pack 11 Special Build 36826, 10.1 prior to fix pack 6 Special Build 36827, 10.5 prior to fix pack 7 Special Build 36828, or 11.1.2.2 prior to fix pack 2 Special Build 36792. It is, therefore, affected by multiple vulnerabilities related to privilege escalation as described in the advisories. Note: swg22007183 only affects 10.5.x and 11.1.2.2.x, and swg22005740 only affects 11.1.2.2.x.
    last seen2020-06-01
    modified2020-06-02
    plugin id103252
    published2017-09-15
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/103252
    titleIBM DB2 9.7 < FP11 Special Build 36826 / 10.1 < FP6 Special Build 36827 / 10.5 < FP8 Special Build 36828 / 11.1.2.2 < FP2 Special Build 36792 Multiple Vulnerabilities (UNIX)
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(103252);
  script_version("1.7");
  script_cvs_date("Date: 2019/11/12");

  script_cve_id(
    "CVE-2017-1420",
    "CVE-2017-1434",
    "CVE-2017-1438",
    "CVE-2017-1439",
    "CVE-2017-1452",
    "CVE-2017-1519"
  );

  script_name(english:"IBM DB2 9.7 < FP11 Special Build 36826 / 10.1 < FP6 Special Build 36827 / 10.5 < FP8 Special Build 36828 / 11.1.2.2 < FP2 Special Build 36792 Multiple Vulnerabilities (UNIX)");
  script_summary(english:"Checks the DB2 signature.");

  script_set_attribute(attribute:"synopsis", value:
"The remote database server is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its version, the installation of IBM DB2 running on the
remote host is either 9.7 prior to fix pack 11 Special Build 36826,
10.1 prior to fix pack 6 Special Build 36827, 10.5 prior to fix
pack 7 Special Build 36828, or 11.1.2.2 prior to fix pack 2 Special 
Build 36792. It is, therefore, affected by multiple
vulnerabilities related to privilege escalation as described in the advisories.

Note: swg22007183 only affects 10.5.x and 11.1.2.2.x, and swg22005740 
only affects 11.1.2.2.x.");
  script_set_attribute(attribute:"see_also", value:"http://www-01.ibm.com/support/docview.wss?uid=swg22006061");
  script_set_attribute(attribute:"see_also", value:"http://www-01.ibm.com/support/docview.wss?uid=swg22006885");
  script_set_attribute(attribute:"see_also", value:"http://www-01.ibm.com/support/docview.wss?uid=swg22006109");
  script_set_attribute(attribute:"see_also", value:"http://www-01.ibm.com/support/docview.wss?uid=swg22007183");
  script_set_attribute(attribute:"see_also", value:"http://www-01.ibm.com/support/docview.wss?uid=swg22007186");
  script_set_attribute(attribute:"see_also", value:"http://www-01.ibm.com/support/docview.wss?uid=swg22005740");
  script_set_attribute(attribute:"solution", value:
"Apply the appropriate IBM DB2 Special Build based on the most recent
fix pack level for your branch.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/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:L/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-2017-1452");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/09/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/09/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/09/15");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:ibm:db2");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("db2_installed.nbin");
  script_require_keys("installed_sw/DB2 Server");
  script_exclude_keys("SMB/db2/Installed");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("install_func.inc");
include("db2_report_func.inc");

# The remote host's OS is Windows, not Linux.
if (get_kb_item("SMB/db2/Installed")) audit(AUDIT_OS_NOT, "Linux", "Windows");

app = "DB2 Server";
install  = get_single_install(app_name:app, exit_if_unknown_ver:TRUE);

# DB2 has an optional OpenSSH server that will run on 
# windows.  We need to exit out if we picked up the windows
# installation that way.
if ("Windows" >< install['platform'])
  audit(AUDIT_HOST_NOT, "Linux based operating system");

port     = install['port'];
version  = kb_version = install['version'];
path     = install['path'];
special_build = install['special_build'];
if(!port) port = 0;

if (empty_or_null(special_build)) special_build = "None";
if (special_build != "None") kb_version += " with Special Build " + special_build;

fix_ver = NULL;
fix_build = NULL;

if (version =~ "^9\.7\.")
{
  fix_ver = "9.7.0.11";
  fix_build = "36826";
}
else if (version =~ "^10\.1\.")
{
  fix_ver = "10.1.0.6";
  fix_build = "36827";
}
else if (version =~ "^10\.5\.")
{
  fix_ver = "10.5.0.8";
  fix_build = "36828";
}
else if (version =~ "^11\.")
{
  fix_ver = "11.1.2.2";
  fix_build = "36792";
}
else
  audit(AUDIT_INST_PATH_NOT_VULN, app, kb_version, path);

vuln = FALSE;
if (!isnull(fix_ver))
{
  cmp = ver_compare(ver:version, fix:fix_ver, strict:FALSE);
  # less than current fix pack
  if(cmp < 0)
    vuln = TRUE;
  else if (cmp == 0 && !isnull(fix_build))
  {
    # missing special build or less than current special build
    if (special_build == "None" || ver_compare(ver:special_build, fix:fix_build, strict:FALSE) < 0)
      vuln = TRUE;
  }
}

if (!vuln)
    audit(AUDIT_INST_PATH_NOT_VULN, app, kb_version, path);

report_db2(
    severity          : SECURITY_HOLE,
    port              : port,
    product           : app,
    path              : path,
    installed_version : version,
    fixed_version     : fix_ver,
    special_installed : special_build,
    special_fix       : fix_build);
  • NASL familyWindows
    NASL idDB2_CONNECT_1112FP2_36792_WIN.NASL
    descriptionAccording to its version, the installation of IBM DB2 running on the remote host is either 10.5 prior to fix pack 8 Special Build 36828, or 11.1.2.2 prior to fix pack 2 Special Build 36792. It is, therefore, affected by multiple vulnerabilities related to denial of service and possible exposure of highly sensitive information as described in the advisories. Note: swg22005740 only affects 11.1.2.2.x.
    last seen2020-06-01
    modified2020-06-02
    plugin id103254
    published2017-09-15
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/103254
    titleIBM DB2 10.5 < FP8 Special Build 36828 / 11.1.2.2 < FP2 Special Build 36792 Multiple Vulnerabilities (Windows)
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(103254);
  script_version("1.8");
  script_cvs_date("Date: 2019/11/12");

  script_cve_id("CVE-2017-1434", "CVE-2017-1519");

  script_name(english:"IBM DB2 10.5 < FP8 Special Build 36828 / 11.1.2.2 < FP2 Special Build 36792 Multiple Vulnerabilities (Windows)");
  script_summary(english:"Checks the DB2 Connect signature.");

  script_set_attribute(attribute:"synopsis", value:
"The remote database server is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its version, the installation of IBM DB2 running on the
  remote host is either 10.5 prior to fix
  pack 8 Special Build 36828, or 11.1.2.2 prior to fix pack 2 Special
  Build 36792. It is, therefore, affected by multiple
  vulnerabilities related to denial of service and possible
  exposure of highly sensitive information as described in the advisories.

  Note: swg22005740 only affects 11.1.2.2.x.");
  script_set_attribute(attribute:"see_also", value:"http://www-01.ibm.com/support/docview.wss?uid=swg22007183");
  script_set_attribute(attribute:"see_also", value:"http://www-01.ibm.com/support/docview.wss?uid=swg22005740");
  script_set_attribute(attribute:"solution", value:
"Apply the appropriate IBM DB2 Connect Special Build
based on the most recent fix pack level for your branch.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-1434");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/09/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/09/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/09/15");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:ibm:db2_connect");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("db2_and_db2_connect_installed.nbin");
  script_require_keys("SMB/db2_connect/Installed");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("install_func.inc");
include("misc_func.inc");
include("db2_report_func.inc");

app = "DB2 Connect Server";
if(!get_kb_item("SMB/db2_connect/Installed")) audit(AUDIT_NOT_INST, app);
install = get_single_install(app_name:app, exit_if_unknown_ver:TRUE);
version = report_version = install['version'];

special_build = install['special_build'];
if (empty_or_null(special_build)) special_build = "None";
if (special_build != "None") report_version += " with Special Build " + special_build;

path = install['path'];

fix_ver = NULL;
fix_build = NULL;

if (version =~ "^10\.5\.")
{
  fix_ver = "10.5.800.381";
  fix_build = "36828";
}
else if (version =~ "^11\.")
{
  fix_ver = "11.1.2020.1393";
  fix_build = "36792";
}
else
  audit(AUDIT_INST_PATH_NOT_VULN, app, report_version, path);

vuln = FALSE;
cmp = ver_compare(ver:version, fix:fix_ver, strict:FALSE);
# less than current fix pack                                      
if (cmp < 0)
  vuln = TRUE;
else if (cmp == 0 && !isnull(fix_build))
{
  # missing special build or less than current special build      
  if (special_build == "None" || ver_compare(ver:special_build, fix:fix_build, strict:FALSE) < 0)
    vuln = TRUE;
}

if (!vuln)
  audit(AUDIT_INST_PATH_NOT_VULN, app, report_version, path);

port = get_kb_item("SMB/transport");
if (!port) port = 445;

report_db2(
    severity          : SECURITY_NOTE,
    port              : port,
    product           : app,
    path              : path,
    installed_version : version,
    fixed_version     : fix_ver,
    special_installed : special_build,
    special_fix       : fix_build);

References