Lenovo ThinkPad SMM BIOS Write Protection Sleep Mode privileges management

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.2$0-$5k0.00

Summaryinfo

A vulnerability was found in Lenovo ThinkPad and classified as critical. Affected by this issue is some unknown functionality of the component SMM BIOS Write Protection. Executing a manipulation as part of Sleep Mode can lead to privileges management. This vulnerability is tracked as CVE-2020-8341. The physical device can be targeted for the attack. No exploit exists.

Detailsinfo

A vulnerability was found in Lenovo ThinkPad (the affected version is unknown). It has been declared as problematic. This vulnerability affects an unknown code of the component SMM BIOS Write Protection. The manipulation as part of a Sleep Mode leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In Lenovo systems, SMM BIOS Write Protection is used to prevent writes to SPI Flash. While this provides sufficient protection, an additional layer of protection is provided by SPI Protected Range Registers (PRx). After resuming from S3 sleep mode in various versions of BIOS for some Lenovo ThinkPad systems, the PRx is not set. This does not impact the SMM BIOS Write Protection, which keeps systems protected.

The weakness was disclosed 09/01/2020 (Website). The advisory is shared for download at support.lenovo.com. This vulnerability was named CVE-2020-8341 since 01/28/2020. The exploitation appears to be difficult. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

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

The entry VDB-160611 is pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.2
VulDB Meta Temp Score: 3.2

VulDB Base Score: 3.9
VulDB Temp Score: 3.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 2.4
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Yes
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/28/2020 🔍
09/01/2020 +217 days 🔍
09/02/2020 +1 days 🔍
09/02/2020 +0 days 🔍

Sourcesinfo

Vendor: lenovo.com

Advisory: support.lenovo.com
Status: Not defined

CVE: CVE-2020-8341 (🔍)
GCVE (CVE): GCVE-0-2020-8341
GCVE (VulDB): GCVE-100-160612
See also: 🔍

Entryinfo

Created: 09/02/2020 08:11
Updated: 09/02/2020 08:16
Changes: 09/02/2020 08:11 (38), 09/02/2020 08:16 (17)
Complete: 🔍
Cache ID: 216::103

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