CVE-2020-15705— GRUB2: avoid loading unsigned kernels when GRUB is booted directly under secureboot without shim
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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: NVD (National Vulnerability Database)
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: 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
密码学签名的验证不恰当
Source: NVD (National Vulnerability Database)
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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|---|
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- oss-security - multiple secure boot grub2 and linux kernel vulnerabilitiesx_refsource_CONFIRM
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011x_refsource_CONFIRM
- https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/x_refsource_CONFIRM
- Security Vulnerability: "Boothole" grub2 UEFI secure boot lockdown bypass | SUSE | Support Centervendor-advisoryx_refsource_SUSE
- https://security.netapp.com/advisory/ntap-20200731-0008/x_refsource_CONFIRM
- https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.htmlx_refsource_CONFIRM
- https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypassvendor-advisoryx_refsource_UBUNTU
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.htmlvendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.htmlvendor-advisoryx_refsource_SUSE
- https://nvd.nist.gov/vuln/detail/CVE-2020-15705
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 |
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V. Comments for CVE-2020-15705
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