what you don't know can hurt you
Home Files News &[SERVICES_TAB]About Contact Add New

Red Hat Security Advisory 2018-2933-01

Red Hat Security Advisory 2018-2933-01
Posted Oct 17, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-2933-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include denial of service and use-after-free vulnerabilities.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2018-10675, CVE-2018-14634, CVE-2018-5390, CVE-2018-5391
SHA-256 | da44b65ca026d77d9fe69150ad4681fb84a6bfef262200d65ea41479d52319b6

Red Hat Security Advisory 2018-2933-01

Change Mirror Download
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

====================================================================
Red Hat Security Advisory

Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2018:2933-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:2933
Issue date: 2018-10-16
CVE Names: CVE-2018-5390 CVE-2018-5391 CVE-2018-10675
CVE-2018-14634
====================================================================
1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 6.5
Advanced 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 Server AUS (v. 6.5) - noarch, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 6.5) - 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)

* A flaw named FragmentSmack was found in the way the Linux kernel handled
reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use
this flaw to trigger time and calculation expensive fragment reassembly
algorithm by sending specially crafted packets which could lead to a CPU
saturation and hence a denial of service on the system. (CVE-2018-5391)

* kernel: mm: use-after-free in do_get_mempolicy function allows local DoS
or other unspecified impact (CVE-2018-10675)

* kernel: Integer overflow in Linux's create_elf_tables function
(CVE-2018-14634)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department
of Communications and Networking and Nokia Bell Labs) for reporting
CVE-2018-5390 and CVE-2018-5391 and Qualys Research Labs for reporting
CVE-2018-14634.

Bug Fix(es):

* Previously, invalid headers in the sk_buff struct led to an indefinite
loop in the tcp_collapse() function. As a consequence, the system became
unresponsive. This update backports the upstream changes that remove the
problematic code in tcp_collapse(). As a result, the system no longer hangs
in the described scenario. (BZ#1619630)

* After updating the system to prevent the L1 Terminal Fault (L1TF)
vulnerability, only one thread was detected on systems that offer
processing of two threads on a single processor core. With this update, the
"__max_smt_threads()" function has been fixed. As a result, both threads
are now detected correctly in the described situation. (BZ#1625333)

* Previously, a kernel panic occurred when the kernel tried to make an out
of bound access to the array that describes the L1 Terminal Fault (L1TF)
mitigation state on systems without Extended Page Tables (EPT) support.
This update extends the array of mitigation states to cover all the states,
which effectively prevents out of bound array access. Also, this update
enables rejecting invalid, irrelevant values, that might be erroneously
provided by the userspace. As a result, the kernel no longer panics in the
described scenario. (BZ#1629632)

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/):

1575065 - CVE-2018-10675 kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact
1601704 - CVE-2018-5390 kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack)
1609664 - CVE-2018-5391 kernel: IP fragments with random offsets allow a remote denial of service (FragmentSmack)
1624498 - CVE-2018-14634 kernel: Integer overflow in Linux's create_elf_tables function

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 6.5):

Source:
kernel-2.6.32-431.93.2.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-431.93.2.el6.noarch.rpm
kernel-doc-2.6.32-431.93.2.el6.noarch.rpm
kernel-firmware-2.6.32-431.93.2.el6.noarch.rpm

x86_64:
kernel-2.6.32-431.93.2.el6.x86_64.rpm
kernel-debug-2.6.32-431.93.2.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-431.93.2.el6.x86_64.rpm
kernel-debug-devel-2.6.32-431.93.2.el6.x86_64.rpm
kernel-debuginfo-2.6.32-431.93.2.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-431.93.2.el6.x86_64.rpm
kernel-devel-2.6.32-431.93.2.el6.x86_64.rpm
kernel-headers-2.6.32-431.93.2.el6.x86_64.rpm
perf-2.6.32-431.93.2.el6.x86_64.rpm
perf-debuginfo-2.6.32-431.93.2.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-431.93.2.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 6.5):

Source:
kernel-2.6.32-431.93.2.el6.src.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-431.93.2.el6.x86_64.rpm
kernel-debuginfo-2.6.32-431.93.2.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-431.93.2.el6.x86_64.rpm
perf-debuginfo-2.6.32-431.93.2.el6.x86_64.rpm
python-perf-2.6.32-431.93.2.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-431.93.2.el6.x86_64.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/cve/CVE-2018-5391
https://access.redhat.com/security/cve/CVE-2018-10675
https://access.redhat.com/security/cve/CVE-2018-14634
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/articles/3553061
https://access.redhat.com/security/vulnerabilities/mutagen-astronomy

8. Contact:

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

Copyright 2018 Red Hat, Inc.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
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-----END PGP SIGNATURE-----

--
RHSA-announce mailing list
RHSA-announce@redhat.com
https://www.redhat.com/mailman/listinfo/rhsa-announce
Login or Register to add favorites

File Archive:

March 2024

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Mar 1st
    16 Files
  • 2
    Mar 2nd
    0 Files
  • 3
    Mar 3rd
    0 Files
  • 4
    Mar 4th
    32 Files
  • 5
    Mar 5th
    28 Files
  • 6
    Mar 6th
    42 Files
  • 7
    Mar 7th
    17 Files
  • 8
    Mar 8th
    13 Files
  • 9
    Mar 9th
    0 Files
  • 10
    Mar 10th
    0 Files
  • 11
    Mar 11th
    15 Files
  • 12
    Mar 12th
    19 Files
  • 13
    Mar 13th
    21 Files
  • 14
    Mar 14th
    38 Files
  • 15
    Mar 15th
    15 Files
  • 16
    Mar 16th
    0 Files
  • 17
    Mar 17th
    0 Files
  • 18
    Mar 18th
    10 Files
  • 19
    Mar 19th
    32 Files
  • 20
    Mar 20th
    46 Files
  • 21
    Mar 21st
    16 Files
  • 22
    Mar 22nd
    13 Files
  • 23
    Mar 23rd
    0 Files
  • 24
    Mar 24th
    0 Files
  • 25
    Mar 25th
    12 Files
  • 26
    Mar 26th
    31 Files
  • 27
    Mar 27th
    19 Files
  • 28
    Mar 28th
    42 Files
  • 29
    Mar 29th
    0 Files
  • 30
    Mar 30th
    0 Files
  • 31
    Mar 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close