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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel PI Futex Requeuing Bug Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1030631
SecurityTracker URL:  http://securitytracker.com/id/1030631
CVE Reference:   CVE-2014-3153   (Links to External Site)
Date:  Jul 23 2014
Impact:   Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 6
Description:   A vulnerability was reported in the Linux Kernel. A local user can obtain elevated privileges on the target system.

A local user can can exploit a flaw in the requeuing of Priority Inheritance (PI) to PI futexes to gain elevated privileges on the target system.

Impact:   A local user can obtain elevated privileges on the target system.
Solution:   Red Hat has issued a fix for Red Hat Enterprise MRG.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2014-0913.html

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Jun 19 2014 Linux Kernel PI Futex Requeuing Bug Lets Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  [RHSA-2014:0913-01] Important: kernel-rt security update

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

Synopsis:          Important: kernel-rt security update
Advisory ID:       RHSA-2014:0913-01
Product:           Red Hat Enterprise MRG for RHEL-6
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2014-0913.html
Issue date:        2014-07-22
CVE Names:         CVE-2014-0181 CVE-2014-0206 CVE-2014-3144 
                   CVE-2014-3145 CVE-2014-3153 CVE-2014-3917 
                   CVE-2014-3940 CVE-2014-4027 CVE-2014-4667 
                   CVE-2014-4699 
=====================================================================

1. Summary:

Updated kernel-rt packages that fix multiple security issues are now
available for Red Hat Enterprise MRG 2.5.

The Red Hat Security Response Team has rated this update as having
Important 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:

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

3. Description:

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

* A flaw was found in the way the Linux kernel's futex subsystem handled
the requeuing of certain Priority Inheritance (PI) futexes. A local,
unprivileged user could use this flaw to escalate their privileges on the
system. (CVE-2014-3153, Important)

* It was found that the Linux kernel's ptrace subsystem allowed a traced
process' instruction pointer to be set to a non-canonical memory address
without forcing the non-sysret code path when returning to user space.
A local, unprivileged user could use this flaw to crash the system or,
potentially, escalate their privileges on the system. (CVE-2014-4699,
Important)

Note: The CVE-2014-4699 issue only affected systems using an Intel CPU.

* It was found that the permission checks performed by the Linux kernel
when a netlink message was received were not sufficient. A local,
unprivileged user could potentially bypass these restrictions by passing a
netlink socket as stdout or stderr to a more privileged process and
altering the output of this process. (CVE-2014-0181, Moderate)

* It was found that the aio_read_events_ring() function of the Linux
kernel's Asynchronous I/O (AIO) subsystem did not properly sanitize the AIO
ring head received from user space. A local, unprivileged user could use
this flaw to disclose random parts of the (physical) memory belonging to
the kernel and/or other processes. (CVE-2014-0206, Moderate)

* An out-of-bounds memory access flaw was found in the Netlink Attribute
extension of the Berkeley Packet Filter (BPF) interpreter functionality in
the Linux kernel's networking implementation. A local, unprivileged user
could use this flaw to crash the system or leak kernel memory to user space
via a specially crafted socket filter. (CVE-2014-3144, CVE-2014-3145,
Moderate)

* An out-of-bounds memory access flaw was found in the Linux kernel's
system call auditing implementation. On a system with existing audit rules
defined, a local, unprivileged user could use this flaw to leak kernel
memory to user space or, potentially, crash the system. (CVE-2014-3917,
Moderate)

* A flaw was found in the way Linux kernel's Transparent Huge Pages (THP)
implementation handled non-huge page migration. A local, unprivileged user
could use this flaw to crash the kernel by migrating transparent hugepages.
(CVE-2014-3940, Moderate)

* An integer underflow flaw was found in the way the Linux kernel's Stream
Control Transmission Protocol (SCTP) implementation processed certain
COOKIE_ECHO packets. By sending a specially crafted SCTP packet, a remote
attacker could use this flaw to prevent legitimate connections to a
particular SCTP server socket to be made. (CVE-2014-4667, Moderate)

* An information leak flaw was found in the RAM Disks Memory Copy (rd_mcp)
backend driver of the iSCSI Target subsystem of the Linux kernel.
A privileged user could use this flaw to leak the contents of kernel memory
to an iSCSI initiator remote client. (CVE-2014-4027, Low)

Red Hat would like to thank Kees Cook of Google for reporting
CVE-2014-3153, Andy Lutomirski for reporting CVE-2014-4699 and
CVE-2014-0181, and Gopal Reddy Kodudula of Nokia Siemens Networks for
reporting CVE-2014-4667. Google acknowledges Pinkie Pie as the original
reporter of CVE-2014-3153. The CVE-2014-0206 issue was discovered by
Mateusz Guzik of Red Hat.

Users are advised to upgrade to these updated packages, which upgrade the
kernel-rt kernel to version kernel-rt-3.10.33-rt32.43 and 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.

This update is available via the Red Hat Network. Details on how to use the
Red Hat Network to apply this update are available at
https://access.redhat.com/site/articles/11258

To install kernel packages manually, use "rpm -ivh [package]". Do not use
"rpm -Uvh" as that will remove the running kernel binaries from your
system. You may use "rpm -e" to remove old kernels after determining that
the new kernel functions properly on your system.

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

1094265 - CVE-2014-0181 kernel: net: insufficient permision checks of netlink messages
1094602 - CVE-2014-0206 kernel: aio: insufficient sanitization of head in aio_read_events_ring()
1096775 - CVE-2014-3144 CVE-2014-3145 Kernel: filter: prevent nla extensions to peek beyond the end of the message
1102571 - CVE-2014-3917 kernel: DoS with syscall auditing
1103626 - CVE-2014-3153 kernel: futex: pi futexes requeue issue
1104097 - CVE-2014-3940 Kernel: missing check during hugepage migration
1108744 - CVE-2014-4027 Kernel: target/rd: imformation leakage
1113967 - CVE-2014-4667 kernel: sctp: sk_ack_backlog wrap-around problem
1115927 - CVE-2014-4699 kernel: x86_64: ptrace: sysret to non-canonical address

6. Package List:

MRG Realtime for RHEL 6 Server v.2:

Source:
kernel-rt-3.10.33-rt32.43.el6rt.src.rpm

noarch:
kernel-rt-doc-3.10.33-rt32.43.el6rt.noarch.rpm
kernel-rt-firmware-3.10.33-rt32.43.el6rt.noarch.rpm

x86_64:
kernel-rt-3.10.33-rt32.43.el6rt.x86_64.rpm
kernel-rt-debug-3.10.33-rt32.43.el6rt.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.33-rt32.43.el6rt.x86_64.rpm
kernel-rt-debug-devel-3.10.33-rt32.43.el6rt.x86_64.rpm
kernel-rt-debuginfo-3.10.33-rt32.43.el6rt.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.33-rt32.43.el6rt.x86_64.rpm
kernel-rt-devel-3.10.33-rt32.43.el6rt.x86_64.rpm
kernel-rt-trace-3.10.33-rt32.43.el6rt.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.33-rt32.43.el6rt.x86_64.rpm
kernel-rt-trace-devel-3.10.33-rt32.43.el6rt.x86_64.rpm
kernel-rt-vanilla-3.10.33-rt32.43.el6rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-3.10.33-rt32.43.el6rt.x86_64.rpm
kernel-rt-vanilla-devel-3.10.33-rt32.43.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/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2014-0181.html
https://www.redhat.com/security/data/cve/CVE-2014-0206.html
https://www.redhat.com/security/data/cve/CVE-2014-3144.html
https://www.redhat.com/security/data/cve/CVE-2014-3145.html
https://www.redhat.com/security/data/cve/CVE-2014-3153.html
https://www.redhat.com/security/data/cve/CVE-2014-3917.html
https://www.redhat.com/security/data/cve/CVE-2014-3940.html
https://www.redhat.com/security/data/cve/CVE-2014-4027.html
https://www.redhat.com/security/data/cve/CVE-2014-4667.html
https://www.redhat.com/security/data/cve/CVE-2014-4699.html
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2014 Red Hat, Inc.
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