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CVE-2020-15705— GRUB2: avoid loading unsigned kernels when GRUB is booted directly under secureboot without shim

Quick assessment

Affected
Ubuntu grub2 in Ubuntu
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GNU社区的一款Linux系统引导程序。 GRUB2 2.04及之前版本中存在数据伪造问题漏洞。该漏洞源于当没有shim直接启动时，程序未验证内核签名。攻击者可利用该漏洞绕过安全启动。

CVSS 6.4 · Medium EPSS 1.39% · P72
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I. Basic Information for CVE-2020-15705

Vulnerability Information
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Vulnerability Title
GRUB2: avoid loading unsigned kernels when GRUB is booted directly under secureboot without shim
Source: CVE Program / CVE List V5
Vulnerability Description
GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed. This only affects systems where the kernel signing certificate has been imported directly into the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects GRUB2 version 2.04 and prior versions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
grub2 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
grub2是GNU社区的一款Linux系统引导程序。 GRUB2 2.04及之前版本中存在数据伪造问题漏洞。该漏洞源于当没有shim直接启动时，程序未验证内核签名。攻击者可利用该漏洞绕过安全启动。
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
Ubuntu grub2 in Ubuntu 20.04 LTS ~ 2.04-1ubuntu26.1 -

II. Public POCs for CVE-2020-15705

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III. Intelligence Information for CVE-2020-15705

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Vendor Advisories for CVE-2020-15705 (9)

Mailing List Discussions for CVE-2020-15705 (9)

Other References for CVE-2020-15705 (2)

Same Patch Batch · Ubuntu · 2020-07-29 · 3 CVEs total

CVE-2020-15706 6.4 MEDIUM GRUB2 contains a race condition leading to a use-after-free vulnerability which can be tri
CVE-2020-15707 5.7 MEDIUM GRUB2 contained integer overflows when handling the initrd command, leading to a heap-base

IV. Related Vulnerabilities

Same product: grub2 in Ubuntu
Same vendor: Ubuntu
Same weakness: CWE-347

V. Comments for CVE-2020-15705

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