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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel IP Fragment Reassembly Algorithm Lets Remote Users Consume Excessive CPU Resources on the Target System
SecurityTracker Alert ID:  1042103
SecurityTracker URL:  http://securitytracker.com/id/1042103
CVE Reference:   CVE-2018-5391   (Links to External Site)
Date:  Nov 13 2018
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 6
Description:   A vulnerability was reported in the Linux kernel. A remote user can consume excessive CPU resources on the target system.

The system uses an inefficient IP fragment reassembly algorithm. A remote user can send specially crafted fragmented data to consume excessive CPU resources on the target system.

Juha-Matti Tilli (Aalto University, Department of Communications and Networking / Nokia Bell Labs) reported this vulnerability.

Impact:   A remote user can consume excessive CPU resources on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2018:3586

Vendor URL:  access.redhat.com/errata/RHSA-2018:3586 (Links to External Site)
Cause:   Resource error

Message History:   This archive entry is a follow-up to the message listed below.
Aug 15 2018 Linux Kernel IP Fragment Reassembly Algorithm Lets Remote Users Consume Excessive CPU Resources on the Target System



 Source Message Contents

Subject:  [RHSA-2018:3586-01] Important: kernel-rt security and bug fix update

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

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2018:3586-01
Product:           Red Hat Enterprise MRG for RHEL-6
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:3586
Issue date:        2018-11-13
CVE Names:         CVE-2017-18344 CVE-2018-5391 CVE-2018-10675 
                   CVE-2018-14634 
=====================================================================

1. Summary:

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.

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 MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64

3. Description:

The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

* 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: out-of-bounds access in the show_timer function in
kernel/time/posix-timers.c (CVE-2017-18344)

* 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-2018-5391 and Qualys Research Labs for reporting CVE-2018-14634.

Bug Fix(es):

* The kernel-rt packages have been upgraded to the 3.10.0-693.43.1 source
tree, which provides a number of bug fixes over the previous version.
(BZ#1632422)

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
1609664 - CVE-2018-5391 kernel: IP fragments with random offsets allow a remote denial of service (FragmentSmack)
1610958 - CVE-2017-18344 kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c
1624498 - CVE-2018-14634 kernel: Integer overflow in Linux's create_elf_tables function

6. Package List:

Red Hat MRG Realtime for RHEL 6 Server v.2:

Source:
kernel-rt-3.10.0-693.43.1.rt56.630.el6rt.src.rpm

noarch:
kernel-rt-doc-3.10.0-693.43.1.rt56.630.el6rt.noarch.rpm
kernel-rt-firmware-3.10.0-693.43.1.rt56.630.el6rt.noarch.rpm

x86_64:
kernel-rt-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-debug-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-debug-devel-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-debuginfo-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-devel-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-trace-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-trace-devel-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-vanilla-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-vanilla-devel-3.10.0-693.43.1.rt56.630.el6rt.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-2017-18344
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.
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