Improper access control in Linux kernel - CVE-2018-17972

Vulnerability identifier: #VU15174

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-17972

CWE-ID: CWE-284

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists within the proc_pid_stack() function in fs/proc/base.c due to the Linux kernel does not ensure that only root may inspect the kernel stack of an arbitrary task. A local user can exploit racy stack unwinding and leak kernel task stack contents.

Linux kernel
Amazon Linux AMI
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for IBM System z (Structure A)
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Fedora

kernel (Red Hat package)
kernel-alt (Red Hat package)
kernel-rt (Red Hat package)
kernel
kernel-headers
kernel-tools
Red Hat Virtualization Host
Data Computing Appliance (DCA)

Install updates from vendor's website.

kernel (Red Hat package) - addressed in versions 2.6.32-754.18.2.el6, 3.10.0-957.10.1.el7
kernel-alt (Red Hat package) - update to 4.14.0-115.7.1.el7a
Data Computing Appliance (DCA) - update to 3.5.4.0
kernel-rt (Red Hat package) - update to 3.10.0-957.10.1.rt56.921.el7
kernel - addressed in versions 4.18.13-100.fc27, 4.18.13-200.fc28, 4.18.13-300.fc29
kernel-headers - addressed in versions 4.18.13-100.fc27, 4.18.13-200.fc28, 4.18.13-300.fc29
kernel-tools - addressed in versions 4.18.13-100.fc27, 4.18.13-200.fc28, 4.18.13-300.fc29

• https://marc.info/?l=linux-fsdevel&m=153806242024956&w=2
• https://bugzilla.redhat.com/show_bug.cgi?id=1636349

• Information disclosure in Linux kernel
• Amazon Linux AMI update for kernel
• Red Hat update for kernel-alt
• Red Hat update for kernel
• Multiple vulnerabilities in Dell EMC Data Computing Appliance (DCA)
• Red Hat Enterprise Linux 7 update for kernel-rt
• Red Hat Enterprise Linux 7 update for kernel
• Fedora 29 update for kernel, kernel-headers, kernel-tools
• Fedora 28 update for kernel, kernel-headers, kernel-tools
• Fedora 27 update for kernel, kernel-headers, kernel-tools