Trustwave SpiderLabs Security Advisory TWSL2016-012:
Multiple Vulnerabilities in Lenovo Solution Center

Vendor: Lenovo (www.lenovo.com)
Product: Lenovo Solution Center
Version affected: 3.3.002 and prior

Product description:
The Lenovo Solution Center is a new software application created by Lenovo for 
Think products. The software allows users to quickly identify the status for 
system health, network connections and overall system security.

Finding 1: Arbitrary code execution by unprivileged local users
Credit: Martin Rakhmanov of Trustwave 
CVE: CVE-2016-5249

Any local user can execute arbitrary code on machine as LocalSystem where 
Lenovo Solution Center 3.3.002 or earlier is installed via set of commands:

1. Create a named pipe and a mutex with some helper application.
2. Issue "sc start LSC.Services.SystemService StartProxy PipeName MutexName PID" command containing information from previous step.
3. Observe TCP port that comes to the named pipe from Lenovo service.
4. Using any raw socket client connect to localhost on port retrieved in previous step and send BASE64-encoded commands to the service.
Among others there is a command allowing to load arbitrary .NET assembly into a process running as LocalSystem. This allows to execute any
code as LocalSystem.

Finding 2: Arbitrary process termination by unprivileged local users
Credit: Martin Rakhmanov of Trustwave
CVE: CVE-2016-5248

Any local user can kill arbitrary processes on machine where Lenovo Solution 
Center 3.3.002 or earlier is installed via command:

sc start LSC.Services.SystemService StopProxy <PID>

For example:

sc start LSC.Services.SystemService StopProxy 876

Will kill process with ID 876 even if it is running as another (privileged) user.

This could be used in mounting further attacks by disabling AV or some other 
protection mechanisms for instance.

Remediation Steps:
Apply Lenovo Solution Center 3.3.003 or the latest stable version

Revision History:
05/16/2016 - Vulnerability disclosed to vendor
06/21/2016 - Vendor releases fix
06/21/2016 - Advisory published

References
1. https://support.lenovo.com/us/en/product_security/len_7814
2. https://github.com/SpiderLabs/advisories-poc


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About Trustwave SpiderLabs:
SpiderLabs(R) is the advanced security team at Trustwave focused on
application security, incident response, penetration testing, physical
security and security research. The team has performed over a thousand
incident investigations, thousands of penetration tests and hundreds of
application security tests globally. In addition, the SpiderLabs Research
team provides intelligence through bleeding-edge research and proof of
concept tool development to enhance Trustwave's products and services.
https://www.trustwave.com/spiderlabs

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