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CVE-2020-15706— GRUB2 contains a race condition leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing.

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及之前版本中的‘grub_script_function_create()’函数存在资源管理错误漏洞。攻击者可利用该漏洞执行任意代码并绕过安全启动限制。

CVSS 6.4 · Medium EPSS 0.98% · P61
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I. Basic Information for CVE-2020-15706

Vulnerability Information
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Vulnerability Title
GRUB2 contains a race condition leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing.
Source: CVE Program / CVE List V5
Vulnerability Description
GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing, leading to arbitrary code execution and secure boot restriction bypass. 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
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
grub2 资源管理错误漏洞
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及之前版本中的‘grub_script_function_create()’函数存在资源管理错误漏洞。攻击者可利用该漏洞执行任意代码并绕过安全启动限制。
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-2020-15706

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III. Intelligence Information for CVE-2020-15706

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Vendor Advisories for CVE-2020-15706 (10)

Mailing List Discussions for CVE-2020-15706 (5)

Other References for CVE-2020-15706 (2)

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

CVE-2020-15705 6.4 MEDIUM GRUB2: avoid loading unsigned kernels when GRUB is booted directly under secureboot withou
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-362

V. Comments for CVE-2020-15706

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