RHSA-2014:1392 - Security Advisory

Topic

Updated kernel packages that fix multiple security issues, address several
hundred bugs, and add numerous enhancements are now available as part of
the ongoing support and maintenance of Red Hat Enterprise Linux version 6.
This is the sixth regular update.

Red Hat Product Security 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.

Description

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

• A NULL pointer dereference flaw was found in the way the Linux kernel's

Stream Control Transmission Protocol (SCTP) implementation handled
simultaneous connections between the same hosts. A remote attacker could
use this flaw to crash the system. (CVE-2014-5077, Important)

• An integer overflow flaw was found in the way the Linux kernel's Frame

Buffer device implementation mapped kernel memory to user space via the
mmap syscall. A local user able to access a frame buffer device file
(/dev/fb*) could possibly use this flaw to escalate their privileges on the
system. (CVE-2013-2596, Important)

• A flaw was found in the way the ipc_rcu_putref() function in the Linux

kernel's IPC implementation handled reference counter decrementing.
A local, unprivileged user could use this flaw to trigger an Out of Memory
(OOM) condition and, potentially, crash the system. (CVE-2013-4483,
Moderate)

• 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 try_to_unmap_cluster() function in the Linux

kernel's Memory Managment subsystem did not properly handle page locking in
certain cases, which could potentially trigger the BUG_ON() macro in the
mlock_vma_page() function. A local, unprivileged user could use this flaw
to crash the system. (CVE-2014-3122, Moderate)

• A flaw was found in the way the Linux kernel's kvm_iommu_map_pages()

function handled IOMMU mapping failures. A privileged user in a guest with
an assigned host device could use this flaw to crash the host.
(CVE-2014-3601, Moderate)

• Multiple use-after-free flaws were found in the way the Linux kernel's

Advanced Linux Sound Architecture (ALSA) implementation handled user
controls. A local, privileged user could use either of these flaws to crash
the system. (CVE-2014-4653, CVE-2014-4654, CVE-2014-4655, Moderate)

• A flaw was found in the way the Linux kernel's VFS subsystem handled

reference counting when performing unmount operations on symbolic links.
A local, unprivileged user could use this flaw to exhaust all available
memory on the system or, potentially, trigger a use-after-free error,
resulting in a system crash or privilege escalation. (CVE-2014-5045,
Moderate)

• An integer overflow flaw was found in the way the lzo1x_decompress_safe()

function of the Linux kernel's LZO implementation processed Literal Runs.
A local attacker could, in extremely rare cases, use this flaw to crash the
system or, potentially, escalate their privileges on the system.
(CVE-2014-4608, Low)

Red Hat would like to thank Vladimir Davydov of Parallels for reporting
CVE-2013-4483, Jack Morgenstein of Mellanox for reporting CVE-2014-3601,
Vasily Averin of Parallels for reporting CVE-2014-5045, and Don A.
Bailey from Lab Mouse Security for reporting CVE-2014-4608. The security
impact of the CVE-2014-3601 issue was discovered by Michael Tsirkin of
Red Hat.

This update also fixes several hundred bugs and adds numerous enhancements.
Refer to the Red Hat Enterprise Linux 6.6 Release Notes for information on
the most significant of these changes, and the Technical Notes for further
information, both linked to in the References.

All Red Hat Enterprise Linux 6 users are advised to install these updated
packages, which correct these issues, and fix the bugs and add the
enhancements noted in the Red Hat Enterprise Linux 6.6 Release Notes and
Technical Notes. The system must be rebooted for this update to
take effect.

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/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.

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

• BZ - 739866 - checkpolicy cannot parse /selinux/policy on ppc64 and s390x
• BZ - 786463 - nfs mount hangs when kerberos ticket expires
• BZ - 889471 - [Btrfs] BUG: unable to handle kernel NULL pointer dereference at (null) btrfs_get_sb should return error when open_ctree failed
• BZ - 915862 - The sync mount option does not work for NFSv4 mounts in RHEL6
• BZ - 997651 - possible recursive locking detected
• BZ - 998024 - nfsd sometimes grants delegations too soon following conflicting open requests
• BZ - 1010882 - kvm: backport "Improve create VCPU parameter"
• BZ - 1024854 - CVE-2013-4483 kernel: ipc: ipc_rcu_putref refcount races
• BZ - 1027480 - alb_send_learning_packets using an obsolete EtherType
• BZ - 1030411 - resizing thin-snapshot with external origin should return zeros behind origin's end
• BZ - 1031488 - Restore the mask bit correctly in eoi_ioapic_irq()
• BZ - 1034490 - CVE-2013-2596 kernel: integer overflow in fb_mmap
• BZ - 1036972 - use after free in new nfsd DRC code
• BZ - 1044438 - cifs: Unable to append to an existing file in cache=none mode.
• BZ - 1059496 - KVM: x86 emulator: Implement jmp far opcode ff/5
• BZ - 1063836 - kvm: 23090: cpu0 unhandled wrmsr 0x391 data 2000000f
• BZ - 1065304 - kernel/sched: incorrect setup of sched_group->cpu_power for NUMA systems
• BZ - 1069028 - ixgbevf prematurely strips VLAN tags
• BZ - 1072373 - Along with the increase of vCPUs in guest, and guest OS will spend more time to boot up in specified machine.
• BZ - 1077463 - gfs2: quotas not refreshed in gfs2_adjust_quota
• BZ - 1090423 - Data integrity issue on rebuilding RAID 6 with 100MB resync speed
• BZ - 1093076 - CVE-2014-3122 Kernel: mm: try_to_unmap_cluster() should lock_page() before mlocking
• BZ - 1094265 - CVE-2014-0181 kernel: net: insufficient permision checks of netlink messages
• BZ - 1095627 - missing vhost schedule causing thread starvation
• BZ - 1100523 - ext4 filesystem option 'max_batch_time' actually displays 'min_batch_time' in /proc/mounts
• BZ - 1113409 - CVE-2014-4653 Kernel: ALSA: control: do not access controls outside of protected regions
• BZ - 1113445 - CVE-2014-4654 CVE-2014-4655 Kernel: ALSA: control: use-after-free in replacing user controls
• BZ - 1113899 - CVE-2014-4608 kernel: lzo1x_decompress_safe() integer overflow
• BZ - 1118123 - [Hyper-V][REHL 6.6] fcopy large file from host to guest failed
• BZ - 1122472 - CVE-2014-5045 kernel: vfs: refcount issues during unmount on symlink
• BZ - 1122982 - CVE-2014-5077 Kernel: net: SCTP: fix a NULL pointer dereference during INIT collisions
• BZ - 1124351 - raid1 Data corruption after recovery with bitmap
• BZ - 1127231 - dmeventd hanging while handling lost leg in RAID1 LV
• BZ - 1131951 - CVE-2014-3601 kernel: kvm: invalid parameter passing in kvm_iommu_map_pages()

CVEs

• CVE-2012-6689
• CVE-2013-2596
• CVE-2013-4483
• CVE-2014-0181
• CVE-2014-3122
• CVE-2014-3601
• CVE-2014-4608
• CVE-2014-4653
• CVE-2014-4654
• CVE-2014-4655
• CVE-2014-5045
• CVE-2014-5077

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.6_Technical_Notes/kernel.html#RHSA-2014-1392
• https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html-single/6.6_Release_Notes/index.html