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.
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
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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|---|
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- https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypassvendor-advisoryx_refsource_UBUNTU
- https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.htmlx_refsource_CONFIRM
- https://security.netapp.com/advisory/ntap-20200731-0008/x_refsource_CONFIRM
- oss-security - multiple secure boot grub2 and linux kernel vulnerabilitiesx_refsource_CONFIRM
- Security Vulnerability: "Boothole" grub2 UEFI secure boot lockdown bypass | SUSE | Support Centervendor-advisoryx_refsource_SUSE
- https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/x_refsource_CONFIRM
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011x_refsource_CONFIRM
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.htmlvendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.htmlvendor-advisoryx_refsource_SUSE
- https://nvd.nist.gov/vuln/detail/CVE-2020-15706
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
V. Comments for CVE-2020-15706
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