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CVE-2022-28736— There's a use-after-free vulnerability in grub_cmd_chainloader() function

Quick assessment

Affected
GNU Project GNU GRUB
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是美国GNU社区的一款Linux系统引导程序。 grub2 存在资源管理错误漏洞，该漏洞源于在grub_cmd_chainloader()中释放后重用。

CVSS 6.4 · Medium EPSS 0.29% · P22
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I. Basic Information for CVE-2022-28736

Vulnerability Information
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Vulnerability Title
There's a use-after-free vulnerability in grub_cmd_chainloader() function
Source: CVE Program / CVE List V5
Vulnerability Description
There's a use-after-free vulnerability in grub_cmd_chainloader() function; The chainloader command is used to boot up operating systems that doesn't support multiboot and do not have direct support from GRUB2. When executing chainloader more than once a use-after-free vulnerability is triggered. If an attacker can control the GRUB2's memory allocation pattern sensitive data may be exposed and arbitrary code execution can be achieved.
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
N/A
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是美国GNU社区的一款Linux系统引导程序。 grub2 存在资源管理错误漏洞，该漏洞源于在grub_cmd_chainloader()中释放后重用。
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
GNU Project GNU GRUB 0 ~ 2.06-3 -

II. Public POCs for CVE-2022-28736

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III. Intelligence Information for CVE-2022-28736

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Vendor Advisories for CVE-2022-28736 (2)

Mailing List Discussions for CVE-2022-28736 (1)

Same Patch Batch · GNU Project · 2023-07-20 · 4 CVEs total

CVE-2022-28734 8.1 HIGH Out-of-bounds write when handling split HTTP headers
CVE-2022-28733 8.1 HIGH Integer underflow in grub_net_recv_ip4_packets
CVE-2022-28735 6.7 MEDIUM grub2 数据伪造问题漏洞

IV. Related Vulnerabilities

Same product: GNU GRUB
Same vendor: GNU Project

V. Comments for CVE-2022-28736

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