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CVE-2023-40550— Shim: out-of-bound read in verify_buffer_sbat()

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 7
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.

Red Hat Shim是美国红帽（Red Hat）公司的一个简单的软件包。旨在用作 UEFI 系统上的第一阶段引导加载程序。 Red Hat Shim 存在安全漏洞，该漏洞源于存在越界读取问题，从而导致在系统启动阶段暴露敏感数据。

CVSS 5.5 · Medium EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1558.005 · Ccache Files
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I. Basic Information for CVE-2023-40550

Vulnerability Information
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Vulnerability Title
Shim: out-of-bound read in verify_buffer_sbat()
Source: CVE Program / CVE List V5
Vulnerability Description
An out-of-bounds read flaw was found in Shim when it tried to validate the SBAT information. This issue may expose sensitive data during the system's boot phase.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Red Hat Shim 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat Shim是美国红帽（Red Hat）公司的一个简单的软件包。旨在用作 UEFI 系统上的第一阶段引导加载程序。 Red Hat Shim 存在安全漏洞，该漏洞源于存在越界读取问题，从而导致在系统启动阶段暴露敏感数据。
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
Red Hat Red Hat Enterprise Linux 7 0:15.8-3.el7 ~ * cpe:/o:redhat:enterprise_linux:7::server
Red Hat Red Hat Enterprise Linux 7 0:15.8-1.el7 ~ * cpe:/o:redhat:enterprise_linux:7::server
Red Hat Red Hat Enterprise Linux 8 0:15.8-4.el8_9 ~ * cpe:/o:redhat:enterprise_linux:8::baseos
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 0:15.8-2.el8_2 ~ * cpe:/o:redhat:rhel_tus:8.2::baseos
Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service 0:15.8-2.el8_2 ~ * cpe:/o:redhat:rhel_tus:8.2::baseos
Red Hat Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions 0:15.8-2.el8_2 ~ * cpe:/o:redhat:rhel_tus:8.2::baseos
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:15.8-2.el8_4 ~ * cpe:/o:redhat:rhel_aus:8.4::baseos
Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service 0:15.8-2.el8_4 ~ * cpe:/o:redhat:rhel_aus:8.4::baseos
Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions 0:15.8-2.el8_4 ~ * cpe:/o:redhat:rhel_aus:8.4::baseos
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support 0:15.8-2.el8_6 ~ * cpe:/o:redhat:rhel_eus:8.6::baseos
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support 0:15.8-2.el8 ~ * cpe:/o:redhat:rhel_eus:8.8::baseos
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support 0:15.8-2.el8 ~ * cpe:/o:redhat:rhel_eus:8.8::baseos
Red Hat Red Hat Enterprise Linux 9 0:15.8-4.el9_3 ~ * cpe:/o:redhat:enterprise_linux:9::baseos
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support 0:15.8-3.el9 ~ * cpe:/a:redhat:rhel_eus:9.0::appstream
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support 0:15.8-2.el9 ~ * cpe:/a:redhat:rhel_eus:9.0::appstream
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support 0:15.8-2.el9 ~ * cpe:/a:redhat:rhel_eus:9.0::appstream
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:15.8-3.el9_2 ~ * cpe:/o:redhat:rhel_eus:9.2::baseos

II. Public POCs for CVE-2023-40550

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III. Intelligence Information for CVE-2023-40550

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Vendor Advisories for CVE-2023-40550 (11)

Mailing List Discussions for CVE-2023-40550 (1)

Same Patch Batch · Red Hat · 2024-01-29 · 5 CVEs total

CVE-2023-40548 7.4 HIGH Shim: interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits sy
CVE-2023-40549 6.2 MEDIUM Shim: out-of-bounds read in verify_buffer_authenticode() malformed pe file
CVE-2023-40546 6.2 MEDIUM Shim: out-of-bounds read printing error messages
CVE-2023-40551 5.1 MEDIUM Shim: out of bounds read when parsing mz binaries

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 7
Same vendor: Red Hat
Same weakness: CWE-125

V. Comments for CVE-2023-40550

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