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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel DCCP Processing Flaw Lets Remote Users Cause the Target System to Crash
SecurityTracker Alert ID:  1037924
SecurityTracker URL:  http://securitytracker.com/id/1037924
CVE Reference:   CVE-2017-2634   (Links to External Site)
Updated:  Feb 28 2017
Original Entry Date:  Feb 28 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 5.6
Description:   A vulnerability was reported in the Linux kernel. A remote user can cause the target system to crash.

The Datagram Congestion Control Protocol (DCCP) implementation uses the IPv4-only inet_sk_rebuild_header() function for both IPv4 and IPv6 DCCP connections. A remote user can send a specially crafted DCCP reset packet via IPv6 to the target DCCP server to trigger a memory corruption error and cause the target kernel to crash.

Wade Mealing (Red Hat Product Security) reported this vulnerability.

Impact:   A remote user can cause the target kernel to crash.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2017-0346.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2017-0346.html (Links to External Site)
Cause:   Access control error, State error

Message History:   This archive entry is a follow-up to the message listed below.
Feb 27 2017 Linux Kernel DCCP Processing Flaw Lets Remote Users Cause the Target System to Crash



 Source Message Contents

Subject:  [RHSA-2017:0346-01] Important: kernel security and bug fix update

-----BEGIN PGP SIGNED MESSAGE-----
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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2017:0346-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2017-0346.html
Issue date:        2017-02-28
CVE Names:         CVE-2017-2634 CVE-2017-6074 
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 5.9 Long
Life.

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 Long Life (v. 5.9 server) - i386, ia64, noarch, x86_64

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

Security Fix(es):

* A use-after-free flaw was found in the way the Linux kernel's Datagram
Congestion Control Protocol (DCCP) implementation freed SKB (socket buffer)
resources for a DCCP_PKT_REQUEST packet when the IPV6_RECVPKTINFO option is
set on the socket. A local, unprivileged user could use this flaw to alter
the kernel memory, allowing them to escalate their privileges on the
system. (CVE-2017-6074, Important)

* It was found that the Linux kernel's Datagram Congestion Control Protocol
(DCCP) implementation used the IPv4-only inet_sk_rebuild_header() function
for both IPv4 and IPv6 DCCP connections, which could result in memory
corruptions. A remote attacker could use this flaw to crash the system.
(CVE-2017-2634, Moderate)

Important: This update disables the DCCP kernel module at load time by
using the kernel module blacklist method. The module is disabled in an
attempt to reduce further exposure to additional issues. (BZ#1426309)

Red Hat would like to thank Andrey Konovalov (Google) for reporting
CVE-2017-6074. The CVE-2017-2634 issue was discovered by Wade Mealing (Red
Hat Product Security).

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/):

1423071 - CVE-2017-6074 kernel: use after free in dccp protocol
1424751 - CVE-2017-2634 kernel: dccp: crash while sending ipv6 reset packet

6. Package List:

Red Hat Enterprise Linux Long Life (v. 5.9 server):

Source:
kernel-2.6.18-348.33.1.el5.src.rpm

i386:
kernel-2.6.18-348.33.1.el5.i686.rpm
kernel-PAE-2.6.18-348.33.1.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-348.33.1.el5.i686.rpm
kernel-PAE-devel-2.6.18-348.33.1.el5.i686.rpm
kernel-debug-2.6.18-348.33.1.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-348.33.1.el5.i686.rpm
kernel-debug-devel-2.6.18-348.33.1.el5.i686.rpm
kernel-debuginfo-2.6.18-348.33.1.el5.i686.rpm
kernel-debuginfo-common-2.6.18-348.33.1.el5.i686.rpm
kernel-devel-2.6.18-348.33.1.el5.i686.rpm
kernel-headers-2.6.18-348.33.1.el5.i386.rpm
kernel-xen-2.6.18-348.33.1.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-348.33.1.el5.i686.rpm
kernel-xen-devel-2.6.18-348.33.1.el5.i686.rpm

ia64:
kernel-2.6.18-348.33.1.el5.ia64.rpm
kernel-debug-2.6.18-348.33.1.el5.ia64.rpm
kernel-debug-debuginfo-2.6.18-348.33.1.el5.ia64.rpm
kernel-debug-devel-2.6.18-348.33.1.el5.ia64.rpm
kernel-debuginfo-2.6.18-348.33.1.el5.ia64.rpm
kernel-debuginfo-common-2.6.18-348.33.1.el5.ia64.rpm
kernel-devel-2.6.18-348.33.1.el5.ia64.rpm
kernel-headers-2.6.18-348.33.1.el5.ia64.rpm
kernel-xen-2.6.18-348.33.1.el5.ia64.rpm
kernel-xen-debuginfo-2.6.18-348.33.1.el5.ia64.rpm
kernel-xen-devel-2.6.18-348.33.1.el5.ia64.rpm

noarch:
kernel-doc-2.6.18-348.33.1.el5.noarch.rpm

x86_64:
kernel-2.6.18-348.33.1.el5.x86_64.rpm
kernel-debug-2.6.18-348.33.1.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-348.33.1.el5.x86_64.rpm
kernel-debug-devel-2.6.18-348.33.1.el5.x86_64.rpm
kernel-debuginfo-2.6.18-348.33.1.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-348.33.1.el5.x86_64.rpm
kernel-devel-2.6.18-348.33.1.el5.x86_64.rpm
kernel-headers-2.6.18-348.33.1.el5.x86_64.rpm
kernel-xen-2.6.18-348.33.1.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-348.33.1.el5.x86_64.rpm
kernel-xen-devel-2.6.18-348.33.1.el5.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-2017-2634
https://access.redhat.com/security/cve/CVE-2017-6074
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/2706661

8. Contact:

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

Copyright 2017 Red Hat, Inc.
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