CVE-2021-3786
Quick assessment
Affected
Lenovo Notebook and ThinkPad BIOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Lenovo ThinkPad是中国联想（Lenovo）公司的一个便携式计算机。 部分联想笔记本电脑和ThinkPad系统的CSME配置中使用的SMI回调函数存在输入验证错误漏洞，攻击者可利用该漏洞获取SMRAM范围以外的数据。
Possible ATT&CK Techniques 1 AI
T1560.001 · Archive via Utility
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I. Basic Information for CVE-2021-3786
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A potential vulnerability in the SMI callback function used in CSME configuration of some Lenovo Notebook and ThinkPad systems could be used to leak out data out of the SMRAM range.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Lenovo ThinkPad 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Lenovo ThinkPad是中国联想（Lenovo）公司的一个便携式计算机。 部分联想笔记本电脑和ThinkPad系统的CSME配置中使用的SMI回调函数存在输入验证错误漏洞，攻击者可利用该漏洞获取SMRAM范围以外的数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Lenovo | Notebook and ThinkPad BIOS | various | - |
|
II. Public POCs for CVE-2021-3786
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2021-3786 (1)
-
https://support.lenovo.com/us/en/product_security/LEN-67440 x_refsource_MISC
Same Patch Batch · Lenovo · 2021-11-12 · 7 CVEs total
| CVE-2021-3843 | 6.7 MEDIUM | Lenovo ThinkPad 输入验证错误漏洞 |
| CVE-2021-3719 | 6.7 MEDIUM | ThinkCentre和ThinkStation输入验证错误漏洞 |
| CVE-2021-3599 | 6.7 MEDIUM | Lenovo ThinkPad 输入验证错误漏洞 |
| CVE-2021-3519 | 6.4 MEDIUM | ThinkStation 授权问题漏洞 |
| CVE-2021-3720 | 5.5 MEDIUM | Legion Phone Pro（L79031）和Legion Phone2 Pro（L70081）上时间天气系统小部件 安全漏洞 |
| CVE-2021-3718 | 4.3 MEDIUM | Lenovo ThinkPad 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2021-3786
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