Vulnerabilities > CVE-2015-2219 - Permissions, Privileges, and Access Controls vulnerability in Lenovo System Update 5.06.0027
Attack vector
LOCAL Attack complexity
LOW Privileges required
NONE Confidentiality impact
COMPLETE Integrity impact
COMPLETE Availability impact
COMPLETE Summary
Lenovo System Update (formerly ThinkVantage System Update) before 5.06.0034 uses predictable security tokens, which allows local users to gain privileges by sending a valid token with a command to the System Update service (SUService.exe) through an unspecified named pipe.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 2 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Accessing, Modifying or Executing Executable Files An attack of this type exploits a system's configuration that allows an attacker to either directly access an executable file, for example through shell access; or in a possible worst case allows an attacker to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
- Leverage Executable Code in Non-Executable Files An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
- Blue Boxing This type of attack against older telephone switches and trunks has been around for decades. A tone is sent by an adversary to impersonate a supervisor signal which has the effect of rerouting or usurping command of the line. While the US infrastructure proper may not contain widespread vulnerabilities to this type of attack, many companies are connected globally through call centers and business process outsourcing. These international systems may be operated in countries which have not upgraded Telco infrastructure and so are vulnerable to Blue boxing. Blue boxing is a result of failure on the part of the system to enforce strong authorization for administrative functions. While the infrastructure is different than standard current applications like web applications, there are historical lessons to be learned to upgrade the access control for administrative functions.
- Restful Privilege Elevation Rest uses standard HTTP (Get, Put, Delete) style permissions methods, but these are not necessarily correlated generally with back end programs. Strict interpretation of HTTP get methods means that these HTTP Get services should not be used to delete information on the server, but there is no access control mechanism to back up this logic. This means that unless the services are properly ACL'd and the application's service implementation are following these guidelines then an HTTP request can easily execute a delete or update on the server side. The attacker identifies a HTTP Get URL such as http://victimsite/updateOrder, which calls out to a program to update orders on a database or other resource. The URL is not idempotent so the request can be submitted multiple times by the attacker, additionally, the attacker may be able to exploit the URL published as a Get method that actually performs updates (instead of merely retrieving data). This may result in malicious or inadvertent altering of data on the server.
- Target Programs with Elevated Privileges This attack targets programs running with elevated privileges. The attacker would try to leverage a bug in the running program and get arbitrary code to execute with elevated privileges. For instance an attacker would look for programs that write to the system directories or registry keys (such as HKLM, which stores a number of critical Windows environment variables). These programs are typically running with elevated privileges and have usually not been designed with security in mind. Such programs are excellent exploit targets because they yield lots of power when they break. The malicious user try to execute its code at the same level as a privileged system call.
Exploit-Db
| description | Lenovo System Update - Privilege Escalation (Metasploit). CVE-2015-2219. Local exploit for Windows platform |
| id | EDB-ID:41708 |
| last seen | 2017-03-23 |
| modified | 2017-03-23 |
| published | 2017-03-23 |
| reporter | Exploit-DB |
| source | https://www.exploit-db.com/download/41708/ |
| title | Lenovo System Update - Privilege Escalation (Metasploit) |
Metasploit
| description | The named pipe, \SUPipeServer, can be accessed by normal users to interact with the System update service. The service provides the possibility to execute arbitrary commands as SYSTEM if a valid security token is provided. This token can be generated by calling the GetSystemInfoData function in the DLL tvsutil.dll. Please, note that the System Update is stopped by default but can be started/stopped calling the Executable ConfigService.exe. |
| id | MSF:EXPLOIT/WINDOWS/LOCAL/LENOVO_SYSTEMUPDATE |
| last seen | 2020-06-04 |
| modified | 2017-07-24 |
| published | 2015-05-14 |
| references | |
| reporter | Rapid7 |
| source | https://github.com/rapid7/metasploit-framework/blob/master//modules/exploits/windows/local/lenovo_systemupdate.rb |
| title | Lenovo System Update Privilege Escalation |
Nessus
| NASL family | Windows |
| NASL id | LENOVO_SU_5_6_0_34.NASL |
| description | The version of Lenovo System Update installed on the remote host is prior to 5.06.0034. It is, therefore, affected by the following vulnerabilities : - A flaw exists in SUService.exe (System Update service) due to generating security tokens for a named pipe in a predictable manner. A local attacker, by sending a valid token, can exploit this flaw to execute commands to gain elevated privileges. (CVE-2015-2219) - A flaw exists due to a failure to properly validate the certificate authority chain when downloading updates. A man-in-the-middle attacker, using a crafted certificate, can exploit this flaw to inject malicious updates, thereby allowing the execution of arbitrary files. (CVE-2015-2233) - A flaw exists due to signature validation for updates occurring in a directory having world-writeable permissions. This can allow a local attacker to swap the update before it is installed and thereby gain elevated privileges. (CVE-2015-2234) Note that Nessus has not tested for these issues but has instead relied only on the application |
| last seen | 2020-06-01 |
| modified | 2020-06-02 |
| plugin id | 83736 |
| published | 2015-05-21 |
| reporter | This script is Copyright (C) 2015-2018 Tenable Network Security, Inc. |
| source | https://www.tenable.com/plugins/nessus/83736 |
| title | Lenovo System Update < 5.06.0034 Multiple Vulnerabilities |
| code | |
Packetstorm
| data source | https://packetstormsecurity.com/files/download/132019/lenovo_systemupdate.rb.txt |
| id | PACKETSTORM:132019 |
| last seen | 2016-12-05 |
| published | 2015-05-23 |
| reporter | h0ng10 |
| source | https://packetstormsecurity.com/files/132019/Lenovo-System-Update-Privilege-Escalation.html |
| title | Lenovo System Update Privilege Escalation |