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CVE-2021-3981

Quick assessment

Affected
n/a grub2
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.

grub2是美国GNU社区的一款Linux系统引导程序。 grub2存在安全漏洞，该漏洞源于 grub.cfg 中的权限不正确，允许非特权用户读取文件内容。

AI Predicted 5.4 Difficulty: Trivial EPSS 0.32% · P23

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2021-3981

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong permission set allowing non privileged users to read its content. This represents a low severity confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg. This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no version with the fix is currently released.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
缺省权限不正确
Source: CVE Program / CVE List V5
Vulnerability Title
grub2 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
grub2是美国GNU社区的一款Linux系统引导程序。 grub2存在安全漏洞，该漏洞源于 grub.cfg 中的权限不正确，允许非特权用户读取文件内容。
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
- grub2 grub2 2.06 and previous versions -

II. Public POCs for CVE-2021-3981

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III. Intelligence Information for CVE-2021-3981

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Vendor Advisories for CVE-2021-3981 (2)

Mailing List Discussions for CVE-2021-3981 (2)

Same Patch Batch · n/a · 2022-03-08 · 9 CVEs total

CVE-2022-0856 libcaca 数字错误漏洞
CVE-2021-4095 Linux kernel 代码问题漏洞
CVE-2022-0516 Linux kernel 缓冲区错误漏洞
CVE-2021-3698 Cockpit 信任管理问题漏洞
CVE-2022-25225 Network Olympus SQL注入漏洞
CVE-2022-24286 Acer QuickAccess 授权问题漏洞
CVE-2022-24285 Acer Care Center 授权问题漏洞
CVE-2021-28488 Ericsson Network Manage安全漏洞

IV. Related Vulnerabilities

Same product: grub2
Same vendor: n/a
Same weakness: CWE-276

V. Comments for CVE-2021-3981

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