CVE-2020-15707— GRUB2 contained integer overflows when handling the initrd command, leading to a heap-based buffer overflow.
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I. Basic Information for CVE-2020-15707
Vulnerability Information
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Vulnerability Title
GRUB2 contained integer overflows when handling the initrd command, leading to a heap-based buffer overflow.
Source: NVD (National Vulnerability Database)
Vulnerability Description
Integer overflows were discovered in the functions grub_cmd_initrd and grub_initrd_init in the efilinux component of GRUB2, as shipped in Debian, Red Hat, and Ubuntu (the functionality is not included in GRUB2 upstream), leading to a heap-based buffer overflow. These could be triggered by an extremely large number of arguments to the initrd command on 32-bit architectures, or a crafted filesystem with very large files on any architecture. An attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. 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:N/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 输入验证错误漏洞
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efilinux组件的‘grub_cmd_initrd’和‘grub_initrd_init’函数存在输入验证错误漏洞。攻击者可利用该漏洞执行任意代码并绕过UEFI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-2020-15707
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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-2020-15707
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-2020-15706 | 6.4 MEDIUM | GRUB2 contains a race condition leading to a use-after-free vulnerability which can be tri |
IV. Related Vulnerabilities
V. Comments for CVE-2020-15707
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