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Category:   OS (Linux)  >   Ping Vendors:   kernel.org
(Red Hat Issues Fix) Linux ping Use-After-Free Memory Error Lets Local Users Deny Service and Gain Elevated Privileges
SecurityTracker Alert ID:  1033198
SecurityTracker URL:  http://securitytracker.com/id/1033198
CVE Reference:   CVE-2015-3636   (Links to External Site)
Date:  Aug 6 2015
Impact:   Denial of service via local system, Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 7
Description:   A vulnerability was reported in Linux ping. A local user can cause denial of service conditions on the target system. A local user can obtain elevated privileges on the target system.

A local user can make a SOCK_DGRAM socket system call for the IPPROTO_ICMP or IPPROTO_ICMPV6 protocols and then make a connect() system call after a disconnect to trigger a use-after-free in the ping_unhash() function to execute arbitrary code or cause the system to crash.

Impact:   A local user can cause the target system to crash.

A local user can obtain root privileges on the target system.

Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-1534.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2015-1534.html (Links to External Site)
Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Aug 6 2015 Linux ping Use-After-Free Memory Error Lets Local Users Deny Service and Gain Elevated Privileges



 Source Message Contents

Subject:  [RHSA-2015:1534-01] Moderate: kernel security and bug fix update

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Hash: SHA1

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

Synopsis:          Moderate: kernel security and bug fix update
Advisory ID:       RHSA-2015:1534-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1534.html
Issue date:        2015-08-05
CVE Names:         CVE-2014-9715 CVE-2015-2666 CVE-2015-2922 
                   CVE-2015-3636 
=====================================================================

1. Summary:

Updated kernel packages that fix multiple security issues and several bugs
are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Moderate security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

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

* An integer overflow flaw was found in the way the Linux kernel's
netfilter connection tracking implementation loaded extensions. An attacker
on a local network could potentially send a sequence of specially crafted
packets that would initiate the loading of a large number of extensions,
causing the targeted system in that network to crash. (CVE-2014-9715,
Moderate)

* A stack-based buffer overflow flaw was found in the Linux kernel's early
load microcode functionality. On a system with UEFI Secure Boot enabled, a
local, privileged user could use this flaw to increase their privileges to
the kernel (ring0) level, bypassing intended restrictions in place.
(CVE-2015-2666, Moderate)

* It was found that the Linux kernel's ping socket implementation did not
properly handle socket unhashing during spurious disconnects, which could
lead to a use-after-free flaw. On x86-64 architecture systems, a local user
able to create ping sockets could use this flaw to crash the system.
On non-x86-64 architecture systems, a local user able to create ping
sockets could use this flaw to escalate their privileges on the system.
(CVE-2015-3636, Moderate)

* It was found that the Linux kernel's TCP/IP protocol suite implementation
for IPv6 allowed the Hop Limit value to be set to a smaller value than the
default one. An attacker on a local network could use this flaw to prevent
systems on that network from sending or receiving network packets.
(CVE-2015-2922, Low)

Red Hat would like to thank Nathan Hoad for reporting the CVE-2014-9715
issue.

This update also fixes several bugs. Refer to the following Knowledgebase
article for further information:

https://access.redhat.com/articles/1474193

All kernel users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. The system must be
rebooted for this update to take effect.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

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

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

1203712 - CVE-2015-2922 kernel: denial of service (DoS) attack against IPv6 network stacks due to improper handling of Router Advertisements.
1204722 - CVE-2015-2666 kernel: execution in the early microcode loader
1208684 - CVE-2014-9715 kernel: netfilter connection tracking extensions denial of service
1218074 - CVE-2015-3636 kernel: ping sockets: use-after-free leading to local privilege escalation

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
kernel-3.10.0-229.11.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-229.11.1.el7.noarch.rpm
kernel-doc-3.10.0-229.11.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debug-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-229.11.1.el7.x86_64.rpm
kernel-devel-3.10.0-229.11.1.el7.x86_64.rpm
kernel-headers-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-229.11.1.el7.x86_64.rpm
perf-3.10.0-229.11.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
kernel-debug-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-229.11.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
python-perf-3.10.0-229.11.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
kernel-3.10.0-229.11.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-229.11.1.el7.noarch.rpm
kernel-doc-3.10.0-229.11.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debug-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-229.11.1.el7.x86_64.rpm
kernel-devel-3.10.0-229.11.1.el7.x86_64.rpm
kernel-headers-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-229.11.1.el7.x86_64.rpm
perf-3.10.0-229.11.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
kernel-debug-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-229.11.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
python-perf-3.10.0-229.11.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
kernel-3.10.0-229.11.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-229.11.1.el7.noarch.rpm
kernel-doc-3.10.0-229.11.1.el7.noarch.rpm

ppc64:
kernel-3.10.0-229.11.1.el7.ppc64.rpm
kernel-bootwrapper-3.10.0-229.11.1.el7.ppc64.rpm
kernel-debug-3.10.0-229.11.1.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-229.11.1.el7.ppc64.rpm
kernel-debug-devel-3.10.0-229.11.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-229.11.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-229.11.1.el7.ppc64.rpm
kernel-devel-3.10.0-229.11.1.el7.ppc64.rpm
kernel-headers-3.10.0-229.11.1.el7.ppc64.rpm
kernel-tools-3.10.0-229.11.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-229.11.1.el7.ppc64.rpm
kernel-tools-libs-3.10.0-229.11.1.el7.ppc64.rpm
perf-3.10.0-229.11.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-229.11.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-229.11.1.el7.ppc64.rpm

s390x:
kernel-3.10.0-229.11.1.el7.s390x.rpm
kernel-debug-3.10.0-229.11.1.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-229.11.1.el7.s390x.rpm
kernel-debug-devel-3.10.0-229.11.1.el7.s390x.rpm
kernel-debuginfo-3.10.0-229.11.1.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-229.11.1.el7.s390x.rpm
kernel-devel-3.10.0-229.11.1.el7.s390x.rpm
kernel-headers-3.10.0-229.11.1.el7.s390x.rpm
kernel-kdump-3.10.0-229.11.1.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-229.11.1.el7.s390x.rpm
kernel-kdump-devel-3.10.0-229.11.1.el7.s390x.rpm
perf-3.10.0-229.11.1.el7.s390x.rpm
perf-debuginfo-3.10.0-229.11.1.el7.s390x.rpm
python-perf-debuginfo-3.10.0-229.11.1.el7.s390x.rpm

x86_64:
kernel-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debug-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-229.11.1.el7.x86_64.rpm
kernel-devel-3.10.0-229.11.1.el7.x86_64.rpm
kernel-headers-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-229.11.1.el7.x86_64.rpm
perf-3.10.0-229.11.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
kernel-3.10.0-229.11.1.ael7b.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-229.11.1.ael7b.noarch.rpm
kernel-doc-3.10.0-229.11.1.ael7b.noarch.rpm

ppc64le:
kernel-3.10.0-229.11.1.ael7b.ppc64le.rpm
kernel-bootwrapper-3.10.0-229.11.1.ael7b.ppc64le.rpm
kernel-debug-3.10.0-229.11.1.ael7b.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-229.11.1.ael7b.ppc64le.rpm
kernel-debuginfo-3.10.0-229.11.1.ael7b.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-229.11.1.ael7b.ppc64le.rpm
kernel-devel-3.10.0-229.11.1.ael7b.ppc64le.rpm
kernel-headers-3.10.0-229.11.1.ael7b.ppc64le.rpm
kernel-tools-3.10.0-229.11.1.ael7b.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-229.11.1.ael7b.ppc64le.rpm
kernel-tools-libs-3.10.0-229.11.1.ael7b.ppc64le.rpm
perf-3.10.0-229.11.1.ael7b.ppc64le.rpm
perf-debuginfo-3.10.0-229.11.1.ael7b.ppc64le.rpm
python-perf-debuginfo-3.10.0-229.11.1.ael7b.ppc64le.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
kernel-debug-debuginfo-3.10.0-229.11.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-229.11.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-229.11.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-229.11.1.el7.ppc64.rpm
kernel-tools-libs-devel-3.10.0-229.11.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-229.11.1.el7.ppc64.rpm
python-perf-3.10.0-229.11.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-229.11.1.el7.ppc64.rpm

s390x:
kernel-debug-debuginfo-3.10.0-229.11.1.el7.s390x.rpm
kernel-debuginfo-3.10.0-229.11.1.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-229.11.1.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-229.11.1.el7.s390x.rpm
perf-debuginfo-3.10.0-229.11.1.el7.s390x.rpm
python-perf-3.10.0-229.11.1.el7.s390x.rpm
python-perf-debuginfo-3.10.0-229.11.1.el7.s390x.rpm

x86_64:
kernel-debug-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-229.11.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
python-perf-3.10.0-229.11.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64le:
kernel-debug-debuginfo-3.10.0-229.11.1.ael7b.ppc64le.rpm
kernel-debug-devel-3.10.0-229.11.1.ael7b.ppc64le.rpm
kernel-debuginfo-3.10.0-229.11.1.ael7b.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-229.11.1.ael7b.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-229.11.1.ael7b.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-229.11.1.ael7b.ppc64le.rpm
perf-debuginfo-3.10.0-229.11.1.ael7b.ppc64le.rpm
python-perf-3.10.0-229.11.1.ael7b.ppc64le.rpm
python-perf-debuginfo-3.10.0-229.11.1.ael7b.ppc64le.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
kernel-3.10.0-229.11.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-229.11.1.el7.noarch.rpm
kernel-doc-3.10.0-229.11.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debug-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-229.11.1.el7.x86_64.rpm
kernel-devel-3.10.0-229.11.1.el7.x86_64.rpm
kernel-headers-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-229.11.1.el7.x86_64.rpm
perf-3.10.0-229.11.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
kernel-debug-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-229.11.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-229.11.1.el7.x86_64.rpm
python-perf-3.10.0-229.11.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-229.11.1.el7.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-2014-9715
https://access.redhat.com/security/cve/CVE-2015-2666
https://access.redhat.com/security/cve/CVE-2015-2922
https://access.redhat.com/security/cve/CVE-2015-3636
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/articles/1474193

8. Contact:

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

Copyright 2015 Red Hat, Inc.
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