Vulnerabilities > CVE-2016-8939 - Information Exposure vulnerability in IBM Tivoli Storage Manager

047910
CVSS 5.5 - MEDIUM
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
LOW
Confidentiality impact
HIGH
Integrity impact
NONE
Availability impact
NONE
local
low complexity
ibm
CWE-200
nessus

Summary

IBM Tivoli Storage Manager (IBM Spectrum Protect 7.1 and 8.1) clients/agents store password information in the Windows Registry in a manner which can be compromised. IBM X-Force ID: 118790.

Vulnerable Configurations

Part Description Count
Application
Ibm
65

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • 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.
  • Footprinting
    An attacker engages in probing and exploration activity to identify constituents and properties of the target. Footprinting is a general term to describe a variety of information gathering techniques, often used by attackers in preparation for some attack. It consists of using tools to learn as much as possible about the composition, configuration, and security mechanisms of the targeted application, system or network. Information that might be collected during a footprinting effort could include open ports, applications and their versions, network topology, and similar information. While footprinting is not intended to be damaging (although certain activities, such as network scans, can sometimes cause disruptions to vulnerable applications inadvertently) it may often pave the way for more damaging attacks.
  • Exploiting Trust in Client (aka Make the Client Invisible)
    An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
  • Browser Fingerprinting
    An attacker carefully crafts small snippets of Java Script to efficiently detect the type of browser the potential victim is using. Many web-based attacks need prior knowledge of the web browser including the version of browser to ensure successful exploitation of a vulnerability. Having this knowledge allows an attacker to target the victim with attacks that specifically exploit known or zero day weaknesses in the type and version of the browser used by the victim. Automating this process via Java Script as a part of the same delivery system used to exploit the browser is considered more efficient as the attacker can supply a browser fingerprinting method and integrate it with exploit code, all contained in Java Script and in response to the same web page request by the browser.
  • Session Credential Falsification through Prediction
    This attack targets predictable session ID in order to gain privileges. The attacker can predict the session ID used during a transaction to perform spoofing and session hijacking.

Nessus

NASL familyMisc.
NASL idIBM_SPECTRUM_PROTECT_CLIENT_SWG22003738.NASL
descriptionThe version of IBM Spectrum Protect Client installed on the remote Windows host is affected by an information disclosure vulnerability due to insecure permission for registry keys under the
last seen2020-06-01
modified2020-06-02
plugin id100718
published2017-06-09
reporterThis script is Copyright (C) 2017-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/100718
titleIBM Spectrum Protect Client Windows Registry Credentials Disclosure
code
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(100718);
  script_version("1.4");
  script_cvs_date("Date: 2018/11/09 10:10:51");

  script_cve_id("CVE-2016-8939");
  script_bugtraq_id(98783);

  script_name(english:"IBM Spectrum Protect Client Windows Registry Credentials Disclosure");
  script_summary(english:"Checks for insecure permissions of registry key for IBM Spectrum Protect Client.");

  script_set_attribute(attribute:"synopsis", value:
"A client application installed on the remote host is affected by an
information disclosure vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of IBM Spectrum Protect Client installed on the remote
Windows host is affected by an information disclosure vulnerability
due to insecure permission for registry keys under the
'HKLM\Software\IBM\ADSM\CurrentVersion\Nodes\' key. A local attacker
can exploit this vulnerability to disclose credentials.

IBM Spectrum Protect was formerly known as IBM Tivoli Storage Manager
in releases prior to version 7.1.3.");
  script_set_attribute(attribute:"see_also", value:"http://www-01.ibm.com/support/docview.wss?uid=swg22003738");
  script_set_attribute(attribute:"see_also", value:"http://www-01.ibm.com/support/docview.wss?uid=swg22000998");
  script_set_attribute(attribute:"see_also", value:"https://improsec.com/blog/vulnerability-in-tsm");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory for instructions on remediation.");
  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:L/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-2016-8939");
  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:"2017/05/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/06/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:ibm:tivoli_storage_manager_client");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/a:ibm:spectrum_protect_client");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2017-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("tivoli_storage_manager_client_installed.nasl", "ibm_spectrum_protect_installed.nbin", "tivoli_storage_manager_virtual_environments_installed.nbin");
  script_require_ports(139, 445, "installed_sw/Tivoli Storage Manager Client", "installed_sw/IBM Spectrum Protect", "installed_sw/Tivoli Storage Manager for Virtual Environments");

  exit(0);
}

include("audit.inc");
include("install_func.inc");
include("smb_func.inc");
include("smb_hotfixes.inc");
include("smb_hotfixes_fcheck.inc");
include("smb_reg_query.inc");
include("misc_func.inc");
include("lists.inc");

function reg_key_readable_by_users_group(security_descriptor)
{
  local_var pdacl, dacl, item, access_rights, sid;
  local_var USERS_SID, REG_ACCESS_READ;

  USERS_SID = "1-5-32-545";
  REG_ACCESS_READ = 0x0020019;

  pdacl = security_descriptor[3];
  pdacl = parse_pdacl(blob:pdacl);
  if (empty_or_null(pdacl))
    return NULL;

  foreach item (pdacl)
  {
    dacl = parse_dacl(blob:item);
    if (empty_or_null(dacl)) continue;

    # SID check
    sid = sid2string(sid:dacl[1]);
    if (empty_or_null(sid)) continue;
    if (sid != USERS_SID) continue;

    # Access rights
    access_rights = dacl[0];
    if (empty_or_null(access_rights)) continue;

    if (access_rights == REG_ACCESS_READ)
      return TRUE;
  }
  return FALSE;
}

apps = ["Tivoli Storage Manager Client","IBM Spectrum Protect","Tivoli Storage Manager for Virtual Environments"];
installed = FALSE;

foreach app (apps) 
{
  if (get_install_count(app_name:app))
  {
    installed = TRUE;
    break;
  }
}
if (!installed) audit(AUDIT_NOT_INST, "IBM Spectrum Protect client / agent");

vuln_keys = [];

registry_init();
hklm = registry_hive_connect(hive:HKEY_LOCAL_MACHINE, exit_on_fail:TRUE);

key = "Software\IBM\ADSM\CurrentVersion\Nodes";
subkeys = get_registry_subkeys(handle:hklm, key:key, wow:TRUE);

foreach item (keys(subkeys))
{
  foreach subkey (subkeys[item])
  {
    working_key = item + "\" + subkey;
    key_h = RegOpenKey(handle:hklm, key:working_key, mode:MAXIMUM_ALLOWED | ACCESS_SYSTEM_SECURITY);
    if(!isnull(key_h))
    {
      # Make sure 'Password' value exists
      if (!isnull(get_registry_value(handle:hklm, item:working_key + "\Password")))
      {
        # Check if Read permissions are granted to Users group
        security_descriptor = RegGetKeySecurity(handle:key_h, type:DACL_SECURITY_INFORMATION);
        if (!isnull(security_descriptor))
        {
          vuln = reg_key_readable_by_users_group(security_descriptor:security_descriptor);
          if (vuln) collib::push("HKLM\"+working_key, vuln_keys);
        }
      }
      RegCloseKey (handle:key_h);
    }
  }
}

RegCloseKey (handle:hklm);
NetUseDel();

if (empty_or_null(vuln_keys))
  exit(0, "The install of IBM Spectrum Protect client / agent is not using a vulnerable configuration.");

wording = NULL;
if (max_index(vuln_keys) == 1)
  wording = "key is";
else
  wording = "keys are";

report =
  '\n The following registry '+wording+' vulnerable :' +
  '\n' +
  '\n  - ' + join(vuln_keys, sep:'\n  - ') +
  '\n';

security_report_v4(port:kb_smb_transport(), extra:report, severity:SECURITY_NOTE);