Improper Privilege Management in Linux kernel - CVE-2020-35513

Vulnerability identifier: #VU69431

CSH Severity: Low

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-35513

CWE-ID: CWE-269

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform a denial of service attack.

The vulnerability exists due to improper privilege management in the Linux kernel NFS (network file system) functionality in the way user create and delete object using NFSv4.2 or newer if both simultaneously accessing the NFS by the other process that is not using new NFSv4.2. A local user can trigger the vulnerability to starve the resources and perform a denial of service attack.

Linux kernel
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
IBM MQ Appliance
Data Computing Appliance (DCA)
Red Hat Advanced Cluster Management for Kubernetes
kernel (Red Hat package)
kernel-rt (Red Hat package)
IBM QRadar Network Security

Install updates from vendor's website.

Linux kernel - update to 4.17 rc1
IBM MQ Appliance - addressed in versions 9.2.0.7, 9.2.5.2
Red Hat Advanced Cluster Management for Kubernetes - addressed in versions 2.0.8, 2.1.3
kernel (Red Hat package) - update to 3.10.0-1160.15.2.el7
kernel-rt (Red Hat package) - update to 3.10.0-1160.15.2.rt56.1152.el7
Data Computing Appliance (DCA) - update to 4.3.0.0
IBM QRadar Network Security - addressed in versions 5.4.0.17, 5.5.0.12

• https://bugzilla.redhat.com/show_bug.cgi?id=1911309
• https://patchwork.kernel.org/project/linux-nfs/patch/20180403203916.GH20297@fieldses.org/

• Multiple vulnerabilities in Dell EMC Data Computing Appliance (DCA)
• Multiple vulnerabilities in IBM QRadar Network Security
• Improper privilege management in IBM MQ Appliance
• Red Hat Enterprise Linux 7 update for kernel
• Red Hat Enterprise Linux 7 update for kernel-rt
• Multiple vulnerabilities in Red Hat Advanced Cluster Management for Kubernetes 2.1
• Multiple vulnerabilities in Red Hat Advanced Cluster Management for Kubernetes 2.0