Vulnerabilities > CVE-2020-4161 - Injection vulnerability in IBM DB2 11.5

047910
CVSS 4.0 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
SINGLE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
PARTIAL
network
low complexity
ibm
CWE-74
nessus

Summary

IBM DB2 for Linux, UNIX and Windows (includes DB2 Connect Server) 11.5 could allow an authenticated attacker to cause a denial of service due to incorrect handling of certain commands. IBM X-Force ID: 174341.

Vulnerable Configurations

Part Description Count
Application
Ibm
1
OS
Ibm
1
OS
Linux
1
OS
Microsoft
1

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 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.
  • Subverting Environment Variable Values
    The attacker directly or indirectly modifies environment variables used by or controlling the target software. The attacker's goal is to cause the target software to deviate from its expected operation in a manner that benefits the attacker.

Nessus

  • NASL familyWindows
    NASL idDB2_115_39711_WIN.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 39672, 10.1 prior to Fix Pack 6 Special Build 39678, 10.5 prior to Fix Pack 10 Special Build 39688, or 11.1 prior to 11.1.4 Fix Pack 5 Special Build 39693, 11.5 prior to Fix Pack 0 Special Build 39711. It is, therefore, affected by one or more of the following vulnerabilities: - An arbitrary code execution vulnerability exists due to incorrect access controls on the fenced execution process. An authenticated, local attacker can exploit this, via specially crafted DB2 commands, to execute arbitrary code as root. (CVE-2019-4057) - A denial of service (DoS) vulnerability exists due to incorrect handling of specially crafted packets. An unauthenticated, remote attacker can exploit this issue, via a specially crafted packet, to cause the application to stop responding. (CVE-2020-4135) - A denial of service (DoS) vulnerability exists due to incorrect handling of certain commands. An authenticated, remote attacker can exploit this issue, via specific commands, to cause the application to stop responding. (CVE-2020-4161) - A denial of service (DoS) vulnerability exists in the JDBC client due to incorrect handling of certain commands. An authenticated, remote attacker can exploit this issue, via specific commands, to cause the application to stop responding. (CVE-2020-4200) - Multiple buffer overflow vulnerabilities exist due to incorrect bounds checking. An authenticated, local attacker can exploit this to execute arbitrary code on the system with root privileges. (CVE-2020-4204) - A privilege escalation vulnerability exists due to incorrect handling of certain commands. An authenticated, local attacker can exploit this, via specially crafted DB2 commands, to gain privileged access to the system. (CVE-2020-4230)
    last seen2020-05-06
    modified2020-02-28
    plugin id134167
    published2020-02-28
    reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/134167
    titleIBM DB2 9.7 < FP11 39672 / 10.1 < FP6 39678 / 10.5 < FP10 39688 / 11.1.4 < FP5 39693 / 11.5 < FP0 39711 Multiple Vulnerabilities (Windows)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    
    include('compat.inc');
    
    if (description)
    {
      script_id(134167);
      script_version("1.7");
      script_set_attribute(attribute:"plugin_modification_date", value:"2020/07/10");
    
      script_cve_id(
        "CVE-2019-4057",
        "CVE-2020-4135",
        "CVE-2020-4161",
        "CVE-2020-4200",
        "CVE-2020-4204",
        "CVE-2020-4230"
      );
      script_xref(name:"IAVB", value:"2020-B-0008-S");
      script_xref(name:"IAVB", value:"2020-B-0024-S");
    
      script_name(english:"IBM DB2 9.7 < FP11 39672 / 10.1 < FP6 39678 / 10.5 < FP10 39688 / 11.1.4 < FP5 39693 / 11.5 < FP0 39711 Multiple Vulnerabilities (Windows)");
      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 39672, 10.1 prior to Fix Pack 6 Special Build 39678, 10.5 prior to Fix Pack 10 Special Build 39688, or
    11.1 prior to 11.1.4 Fix Pack 5 Special Build 39693, 11.5 prior to Fix Pack 0 Special Build 39711. It is, therefore,
    affected by one or more of the following vulnerabilities:
      
      - An arbitrary code execution vulnerability exists due to incorrect access controls on the fenced execution 
        process. An authenticated, local attacker can exploit this, via specially crafted DB2 commands, to execute 
        arbitrary code as root. (CVE-2019-4057)
        
      - A denial of service (DoS) vulnerability exists due to incorrect handling of specially crafted packets. An
        unauthenticated, remote attacker can exploit this issue, via a specially crafted packet, to cause the
        application to stop responding. (CVE-2020-4135)
    
      - A denial of service (DoS) vulnerability exists due to incorrect handling of certain commands. An authenticated,
        remote attacker can exploit this issue, via specific commands, to cause the application to stop responding.
        (CVE-2020-4161)
    
      - A denial of service (DoS) vulnerability exists in the JDBC client due to incorrect handling of certain commands.
        An authenticated, remote attacker can exploit this issue, via specific commands, to cause the application to
        stop responding. (CVE-2020-4200)
    
      - Multiple buffer overflow vulnerabilities exist due to incorrect bounds checking. An authenticated,
        local attacker can exploit this to execute arbitrary code on the system with root privileges.
        (CVE-2020-4204)
        
      - A privilege escalation vulnerability exists due to incorrect handling of certain commands. An authenticated,
        local attacker can exploit this, via specially crafted DB2 commands, to gain privileged access to the system.
        (CVE-2020-4230)");
      script_set_attribute(attribute:"see_also", value:"https://www.ibm.com/support/pages/node/2876307");
      script_set_attribute(attribute:"see_also", value:"https://www.ibm.com/support/pages/node/2874621");
      script_set_attribute(attribute:"see_also", value:"https://www.ibm.com/support/pages/node/2875251");
      script_set_attribute(attribute:"see_also", value:"https://www.ibm.com/support/pages/node/2878809");
      script_set_attribute(attribute:"see_also", value:"https://www.ibm.com/support/pages/node/880735");
      # https://www.ibm.com/support/pages/security-bulletin-multiple-buffer-overflow-vulnerabilities-exist-ibm%C2%AE-db2%C2%AE-leading-privilege-escalation-cve-2020-4204-0
      script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?97828fb6");
      script_set_attribute(attribute:"solution", value:
    "Apply the appropriate IBM DB2 Fix Pack or 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-2020-4204");
    
      script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2020/02/18");
      script_set_attribute(attribute:"patch_publication_date", value:"2020/02/18");
      script_set_attribute(attribute:"plugin_publication_date", value:"2020/02/28");
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"cpe:/a:ibm:db2");
      script_set_attribute(attribute:"stig_severity", value:"I");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_family(english:"Windows");
    
      script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
    
      script_dependencies("db2_and_db2_connect_installed.nbin");
      script_require_keys("SMB/db2/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 Server';
    
    # linux uses register_install, so we need to check this KB item
    if(!get_kb_item('SMB/db2/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 =~ '^9\\.7\\.')
    {
      fix_ver = '9.7.1100.352';
      fix_build = '39672';
    }
    else if (version =~ '^10\\.1\\.')
    {
      fix_ver = '10.1.600.580';
      fix_build = '39678';
    }
    else if (version =~ '^10\\.5\\.')
    {
      fix_ver = '10.5.1100.2866';
    }
    else if (version =~ '^11\\.1\\.')
    {
      fix_ver = '11.1.4050.859';
      fix_build = '39693';
    }
    else if (version =~ '^11\\.5\\.')
    {
      fix_ver = '11.5.0.1077';
      fix_build = '39711';
    }
    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_HOLE,
        port              : port,
        product           : app,
        path              : path,
        installed_version : version,
        fixed_version     : fix_ver,
        special_installed : special_build,
        special_fix       : fix_build);
    
  • NASL familyDatabases
    NASL idDB2_115_39711_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 39672, 10.1 prior to Fix Pack 6 Special Build 39678, 10.5 prior to Fix Pack 10 Special Build 39688, or 11.1 prior to 11.1.4 Fix Pack 5 Special Build 39693, 11.5 prior to Fix Pack 0 Special Build 39711. It is, therefore, affected by one or more of the following vulnerabilities: - An arbitrary code execution vulnerability exists due to incorrect access controls on the fenced execution process. An authenticated, local attacker can exploit this, via specially crafted DB2 commands, to execute arbitrary code as root. (CVE-2019-4057) - A denial of service (DoS) vulnerability exists due to incorrect handling of specially crafted packets. An unauthenticated, remote attacker can exploit this issue, via a specially crafted packet, to cause the application to stop responding. (CVE-2020-4135) - A denial of service (DoS) vulnerability exists due to incorrect handling of certain commands. An authenticated, remote attacker can exploit this issue, via specific commands, to cause the application to stop responding. (CVE-2020-4161) - A denial of service (DoS) vulnerability exists in the JDBC client due to incorrect handling of certain commands. An authenticated, remote attacker can exploit this issue, via specific commands, to cause the application to stop responding. (CVE-2020-4200) - Multiple buffer overflow vulnerabilities exist due to incorrect bounds checking. An authenticated, local attacker can exploit this to execute arbitrary code on the system with root privileges. (CVE-2020-4204) - A privilege escalation vulnerability exists due to incorrect handling of certain commands. An authenticated, local attacker can exploit this, via specially crafted DB2 commands, to gain privileged access to the system. (CVE-2020-4230)
    last seen2020-05-06
    modified2020-02-28
    plugin id134166
    published2020-02-28
    reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/134166
    titleIBM DB2 9.7 < FP11 39672 / 10.1 < FP6 39678 / 10.5 < FP10 39688 / 11.1.4 < FP5 39693 / 11.5 < FP0 39711 Multiple Vulnerabilities (UNIX)