Sigurnosni nedostatak jezgre operacijskog sustava

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Red Hat Security Advisory

Synopsis: Important: kernel security update
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
CVE Names: CVE-2018-5390
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 6.7
Extended Update Support.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

2. 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

3. Description:

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.

4. 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.

5. Bugs fixed (https://bugzilla.redhat.com/):

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

6. 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
kernel-debuginfo-common-x86_64-2.6.32-573.62.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-573.62.1.el6.x86_64.rpm
python-perf-2.6.32-573.62.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-573.62.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 6.7):

Source:
kernel-2.6.32-573.62.1.el6.src.rpm

i386:
kernel-2.6.32-573.62.1.el6.i686.rpm
kernel-debug-2.6.32-573.62.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-573.62.1.el6.i686.rpm
kernel-debug-devel-2.6.32-573.62.1.el6.i686.rpm
kernel-debuginfo-2.6.32-573.62.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-573.62.1.el6.i686.rpm
kernel-devel-2.6.32-573.62.1.el6.i686.rpm
kernel-headers-2.6.32-573.62.1.el6.i686.rpm
perf-2.6.32-573.62.1.el6.i686.rpm
perf-debuginfo-2.6.32-573.62.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-573.62.1.el6.i686.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

ppc64:
kernel-2.6.32-573.62.1.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-573.62.1.el6.ppc64.rpm
kernel-debug-2.6.32-573.62.1.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-573.62.1.el6.ppc64.rpm
kernel-debug-devel-2.6.32-573.62.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-573.62.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-573.62.1.el6.ppc64.rpm
kernel-devel-2.6.32-573.62.1.el6.ppc64.rpm
kernel-headers-2.6.32-573.62.1.el6.ppc64.rpm
perf-2.6.32-573.62.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-573.62.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-573.62.1.el6.ppc64.rpm

s390x:
kernel-2.6.32-573.62.1.el6.s390x.rpm
kernel-debug-2.6.32-573.62.1.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-573.62.1.el6.s390x.rpm
kernel-debug-devel-2.6.32-573.62.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-573.62.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-573.62.1.el6.s390x.rpm
kernel-devel-2.6.32-573.62.1.el6.s390x.rpm
kernel-headers-2.6.32-573.62.1.el6.s390x.rpm
kernel-kdump-2.6.32-573.62.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-573.62.1.el6.s390x.rpm
kernel-kdump-devel-2.6.32-573.62.1.el6.s390x.rpm
perf-2.6.32-573.62.1.el6.s390x.rpm
perf-debuginfo-2.6.32-573.62.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-573.62.1.el6.s390x.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 6.7):

i386:
kernel-debug-debuginfo-2.6.32-573.62.1.el6.i686.rpm
kernel-debuginfo-2.6.32-573.62.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-573.62.1.el6.i686.rpm
perf-debuginfo-2.6.32-573.62.1.el6.i686.rpm
python-perf-2.6.32-573.62.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-573.62.1.el6.i686.rpm

ppc64:
kernel-debug-debuginfo-2.6.32-573.62.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-573.62.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-573.62.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-573.62.1.el6.ppc64.rpm
python-perf-2.6.32-573.62.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-573.62.1.el6.ppc64.rpm

s390x:
kernel-debug-debuginfo-2.6.32-573.62.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-573.62.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-573.62.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-573.62.1.el6.s390x.rpm
perf-debuginfo-2.6.32-573.62.1.el6.s390x.rpm
python-perf-2.6.32-573.62.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-573.62.1.el6.s390x.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. 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

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

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