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Red Hat Enterprise Linux 6.7 RHSA-2018:2645-01 Important DoS Threat

red hat
Calendar Grey September 4, 2018
Scroller Redhat
Red Hat has issued a security advisory regarding an essential kernel update which rectifies a significant vulnerability that could result in potential Denial of Service (DoS) attacks.
An update for kernel is now available for Red Hat Enterprise Linux 6.7 Extended Update Support

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Summary

The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* A flaw named SegmentSmack was found in the way the Linux kernel handled specially crafted TCP packets. A remote attacker could use this flaw to trigger time and calculation expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending specially modified packets within ongoing TCP sessions which could lead to a CPU saturation and hence a denial of service on the system. Maintaining the denial of service condition requires continuous two-way TCP sessions to a reachable open port, thus the attacks cannot be performed using spoofed IP addresses. (CVE-2018-5390)
Red Hat would like to thank Juha-Matti Tilli (Aalto University, Department of Communications and Networking and Nokia Bell Labs) for reporting this issue.

Topics%20covered

Topics Covered

security advisory kernel update DoS remote attack Red Hat Enterprise Linux security patch important flaw

References

https://access.redhat.com/security/cve/CVE-2018-5390 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/cve/cve-2018-5390

Package List

Red Hat Enterprise Linux HPC Node EUS (v. 6.7):
Source: kernel-2.6.32-573.62.1.el6.src.rpm
noarch: kernel-abi-whitelists-2.6.32-573.62.1.el6.noarch.rpm kernel-doc-2.6.32-573.62.1.el6.noarch.rpm kernel-firmware-2.6.32-573.62.1.el6.noarch.rpm
x86_64: kernel-2.6.32-573.62.1.el6.x86_64.rpm kernel-debug-2.6.32-573.62.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-573.62.1.el6.i686.rpm kernel-debug-debuginfo-2.6.32-573.62.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-573.62.1.el6.i686.rpm kernel-debug-devel-2.6.32-573.62.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-573.62.1.el6.i686.rpm kernel-debuginfo-2.6.32-573.62.1.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-573.62.1.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-573.62.1.el6.x86_64.rpm kernel-devel-2.6.32-573.62.1.el6.x86_64.rpm kernel-headers-2.6.32-573.62.1.el6.x86_64.rpm perf-2.6.32-573.62.1.el6.x86_64.rpm perf-debuginfo-2.6.32-573.62.1.el6.i686.rpm perf-debuginfo-2.6.32-573.62.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-573.62.1.el6.i686.rpm python-perf-debuginfo-2.6.32-573.62.1.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.7):
x86_64: kernel-debug-debuginfo-2.6.32-573.62.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-573.62.1.el6.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2018:2645-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:2645
Issue date: 2018-09-04

Topic

An update for kernel is now available for Red Hat Enterprise Linux 6.7Extended Update Support.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory kernel update DoS remote attack Red Hat Enterprise Linux security patch important flaw

Relevant Releases Architectures

Red Hat Enterprise Linux HPC Node EUS (v. 6.7) - noarch, x86_64

Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.7) - x86_64

Red Hat Enterprise Linux Server EUS (v. 6.7) - i386, noarch, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional EUS (v. 6.7) - i386, ppc64, s390x, x86_64

Bugs Fixed

1601704 - CVE-2018-5390 kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack)

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