Improper Authorization in Linux kernel - CVE-2020-15780

Vulnerability identifier: #VU31922

CSH Severity: Low

CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-15780

CWE-ID: CWE-285

Exploitation vector: Local access

Exploit availability: Public exploit is available

The vulnerability allows a local user to bypass authorization checks.

The vulnerability exists due to improper authorization in "in drivers/acpi/acpi_configfs.c". A local administrator can inject malicious ACPI tables via configfs to bypass lockdown and secure boot restrictions.

Linux kernel
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux Server - AUS
kernel (Red Hat package)
kernel-rt (Red Hat package)

Install updates from vendor's website.

Linux kernel - update to 5.7.7
kernel (Red Hat package) - addressed in versions 4.18.0-80.27.2.el8_0, 4.18.0-147.24.2.el8_1, 4.18.0-193.14.3.el8_2
kernel-rt (Red Hat package) - update to 4.18.0-193.14.3.rt13.67.el8_2

• Exploit #9470 - CVE-2020-15780-exploit () (December 28, 2023)

• http://www.openwall.com/lists/oss-security/2020/07/20/7
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.7
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=75b0cea7bf307f362057cc778efe89af4c615354
• https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language-2.sh
• https://www.openwall.com/lists/oss-security/2020/06/15/3

• Multiple vulnerabilities in Linux kernel
• Red Hat Enterprise Linux 8 update for kernel
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8.1 Extended Update Support update for kernel
• Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions update for kernel