A vulnerability has been found in Lenovo ThinkCentre, ThinkServer and ThinkStation (version now known) and classified as critical. Affected by this vulnerability is some unknown processing of the component BIOS. The manipulation with an unknown input leads to a 7pk security vulnerability (Secure Boot). The CWE definition for the vulnerability is CWE-254. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The BIOS for Lenovo ThinkCentre E93, M6500t/s, M6600, M6600q, M6600t/s, M73p, M800, M83, M8500t/s, M8600t/s, M900, M93, and M93P devices; ThinkServer RQ940, RS140, TS140, TS240, TS440, and TS540 devices; and ThinkStation E32, P300, and P310 devices might allow local users or physically proximate attackers to bypass the Secure Boot protection mechanism by leveraging an AMI test key.

The weakness was disclosed 09/22/2016 (Website). It is possible to read the advisory at securityfocus.com. This vulnerability is known as CVE-2016-5247. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1211 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Vendor

• Lenovo

Name

• ThinkCentre
• ThinkServer
• ThinkStation

License

• commercial

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