Improper input validation in Linux kernel - CVE-2018-5391

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU14437

Improper input validation in Linux kernel - CVE-2018-5391

Published: August 15, 2018 / Updated: August 16, 2018


Vulnerability identifier: #VU14437
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-5391
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to an error when handling reassembly of fragmented IPv4 and IPv6 packets. A remote attacker can send specially crafted packets, trigger time and calculation expensive fragment reassembly algorithms and cause the service to crash.


Affected software

Linux kernel
Arch Linux
Debian Linux
Amazon Linux AMI
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
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 IBM System z (Structure A)
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Opensuse

MRG Realtime
kernel (Red Hat package)
kernel-rt (Red Hat package)
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel-alt (Red Hat package)
Data Computing Appliance (DCA)
SAN Volume Controller and Storwize Family

How to mitigate CVE-2018-5391

Install update from vendor's website.

kernel (Red Hat package) - addressed in versions 2.6.32-358.93.1.el6, 2.6.32-431.93.2.el6, 2.6.32-504.76.2.el6, 2.6.32-573.65.2.el6, 2.6.32-754.6.3.el6, 3.10.0-327.76.1.el7, 3.10.0-514.58.1.el7, 3.10.0-693.43.1.el7, 3.10.0-862.20.2.el7
kernel-rt (Red Hat package) - update to 3.10.0-693.43.1.rt56.630.el6rt
Data Computing Appliance (DCA) - update to 3.5.2.0
kernel-alt (Red Hat package) - update to 4.14.0-115.el7a
SAN Volume Controller and Storwize Family - addressed in versions 7.8.1.8, 8.1.3.5, 8.2.0.4, 8.2.1.2

External References

Related Security Bulletins