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Red Hat Security Advisory 2017-1723-01

Red Hat Security Advisory 2017-1723-01
Posted Jul 12, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-1723-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: The NFSv2 and NFSv3 server implementations in the Linux kernel through 4.10.13 lacked certain checks for the end of a buffer. A remote attacker could trigger a pointer-arithmetic error or possibly cause other unspecified impacts using crafted requests related to fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c.

tags | advisory, remote, kernel
systems | linux, redhat
advisories | CVE-2017-7895
SHA-256 | 0dc240c457b2a7a130cf637c2ed5bdf468bb619dfe9e8b60997711285085985d

Red Hat Security Advisory 2017-1723-01

Change Mirror Download

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2017:1723-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:1723
Issue date: 2017-07-11
CVE Names: CVE-2017-7895
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 6.

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 Desktop (v. 6) - i386, noarch, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - noarch, x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

3. Description:

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

Security Fix(es):

* The NFSv2 and NFSv3 server implementations in the Linux kernel through
4.10.13 lacked certain checks for the end of a buffer. A remote attacker
could trigger a pointer-arithmetic error or possibly cause other
unspecified impacts using crafted requests related to fs/nfsd/nfs3xdr.c and
fs/nfsd/nfsxdr.c. (CVE-2017-7895, Important)

Red Hat would like to thank Ari Kauppi for reporting this issue.

Bug Fix(es):

* If several file operations were started after a mounted NFS share had got
idle and its Transmission Control Protocol (TCP) connection had therefore
been terminated, these operations could cause multiple TCP SYN packets
coming from the NFS client instead of one. With this update, the
reconnection logic has been fixed, and only one TCP SYN packet is now sent
in the described situation. (BZ#1450850)

* When the ixgbe driver was loaded for a backplane-connected network card,
a kernel panic could occur, because the ops.setup_fc function pointer was
used before the initialization. With this update, ops.setup_fc is
initialized earlier. As a result, ixgbe no longer panics on load.
(BZ#1457347)

* When setting an Access Control List (ACL) with 190 and more Access
Control Entries (ACEs) on a NFSv4 directory, a kernel crash could
previously occur. This update fixes the nfs4_getfacl() function, and the
kernel no longer crashes under the described circumstances. (BZ#1449096)

* When upgrading to kernel with the fix for stack guard flaw, a crash could
occur in Java Virtual Machine (JVM) environments, which attempted to
implement their own stack guard page. With this update, the underlying
source code has been fixed to consider the PROT_NONE mapping as a part of
the stack, and the crash in JVM no longer occurs under the described
circumstances. (BZ#1466667)

* When a program receives IPv6 packets using the raw socket, the
ioctl(FIONREAD) and ioctl(SIOCINQ) functions can incorrectly return zero
waiting bytes. This update fixes the ip6_input_finish() function to check
the raw payload size properly. As a result, the ioctl() function now
returns bytes waiting in the raw socket correctly. (BZ#1450870)

* Previously, listing a directory on a non-standard XFS filesystem (with
non-default multi-fsb directory blocks) could lead to a soft lock up due to
array index overrun in the xfs_dir2_leaf_readbuf() function. This update
fixes xfs_dir2_leaf_readbuf(), and the soft lock up no longer occurs under
the described circumstances. (BZ#1445179)

* Previously, aborts from the array after the Storage Area Network (SAN)
fabric back-pressure led to premature reuse of still valid sequence with
the same OX_ID. Consequently, an error message and data corruption could
occur. This update fixes the libfc driver to isolate the timed out OX_IDs,
thus fixing this bug. (BZ#1455550)

* Previously, a kernel panic occurred when the mcelog daemon executed a
huge page memory offline. This update fixes the HugeTLB feature of the
Linux kernel to check for the Page Table Entry (PTE) NULL pointer in the
page_check_address() function. As a result, the kernel panic no longer
occurs under the described circumstances. (BZ#1444351)

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/):

1446103 - CVE-2017-7895 kernel: NFSv3 server does not properly handle payload bounds checking of WRITE requests

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
kernel-2.6.32-696.6.3.el6.src.rpm

i386:
kernel-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-devel-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.6.3.el6.i686.rpm
kernel-devel-2.6.32-696.6.3.el6.i686.rpm
kernel-headers-2.6.32-696.6.3.el6.i686.rpm
perf-2.6.32-696.6.3.el6.i686.rpm
perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm

noarch:
kernel-abi-whitelists-2.6.32-696.6.3.el6.noarch.rpm
kernel-doc-2.6.32-696.6.3.el6.noarch.rpm
kernel-firmware-2.6.32-696.6.3.el6.noarch.rpm

x86_64:
kernel-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debug-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debug-devel-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-devel-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.6.3.el6.x86_64.rpm
kernel-devel-2.6.32-696.6.3.el6.x86_64.rpm
kernel-headers-2.6.32-696.6.3.el6.x86_64.rpm
perf-2.6.32-696.6.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
kernel-debug-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.6.3.el6.i686.rpm
perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
python-perf-2.6.32-696.6.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.6.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
python-perf-2.6.32-696.6.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
kernel-2.6.32-696.6.3.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-696.6.3.el6.noarch.rpm
kernel-doc-2.6.32-696.6.3.el6.noarch.rpm
kernel-firmware-2.6.32-696.6.3.el6.noarch.rpm

x86_64:
kernel-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debug-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debug-devel-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-devel-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.6.3.el6.x86_64.rpm
kernel-devel-2.6.32-696.6.3.el6.x86_64.rpm
kernel-headers-2.6.32-696.6.3.el6.x86_64.rpm
perf-2.6.32-696.6.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

x86_64:
kernel-debug-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.6.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
python-perf-2.6.32-696.6.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
kernel-2.6.32-696.6.3.el6.src.rpm

i386:
kernel-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-devel-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.6.3.el6.i686.rpm
kernel-devel-2.6.32-696.6.3.el6.i686.rpm
kernel-headers-2.6.32-696.6.3.el6.i686.rpm
perf-2.6.32-696.6.3.el6.i686.rpm
perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm

noarch:
kernel-abi-whitelists-2.6.32-696.6.3.el6.noarch.rpm
kernel-doc-2.6.32-696.6.3.el6.noarch.rpm
kernel-firmware-2.6.32-696.6.3.el6.noarch.rpm

ppc64:
kernel-2.6.32-696.6.3.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-696.6.3.el6.ppc64.rpm
kernel-debug-2.6.32-696.6.3.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-696.6.3.el6.ppc64.rpm
kernel-debug-devel-2.6.32-696.6.3.el6.ppc64.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-696.6.3.el6.ppc64.rpm
kernel-devel-2.6.32-696.6.3.el6.ppc64.rpm
kernel-headers-2.6.32-696.6.3.el6.ppc64.rpm
perf-2.6.32-696.6.3.el6.ppc64.rpm
perf-debuginfo-2.6.32-696.6.3.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.ppc64.rpm

s390x:
kernel-2.6.32-696.6.3.el6.s390x.rpm
kernel-debug-2.6.32-696.6.3.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-696.6.3.el6.s390x.rpm
kernel-debug-devel-2.6.32-696.6.3.el6.s390x.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-696.6.3.el6.s390x.rpm
kernel-devel-2.6.32-696.6.3.el6.s390x.rpm
kernel-headers-2.6.32-696.6.3.el6.s390x.rpm
kernel-kdump-2.6.32-696.6.3.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-696.6.3.el6.s390x.rpm
kernel-kdump-devel-2.6.32-696.6.3.el6.s390x.rpm
perf-2.6.32-696.6.3.el6.s390x.rpm
perf-debuginfo-2.6.32-696.6.3.el6.s390x.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.s390x.rpm

x86_64:
kernel-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debug-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debug-devel-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-devel-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.6.3.el6.x86_64.rpm
kernel-devel-2.6.32-696.6.3.el6.x86_64.rpm
kernel-headers-2.6.32-696.6.3.el6.x86_64.rpm
perf-2.6.32-696.6.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

i386:
kernel-debug-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.6.3.el6.i686.rpm
perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
python-perf-2.6.32-696.6.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm

ppc64:
kernel-debug-debuginfo-2.6.32-696.6.3.el6.ppc64.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-696.6.3.el6.ppc64.rpm
perf-debuginfo-2.6.32-696.6.3.el6.ppc64.rpm
python-perf-2.6.32-696.6.3.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.ppc64.rpm

s390x:
kernel-debug-debuginfo-2.6.32-696.6.3.el6.s390x.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-696.6.3.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-696.6.3.el6.s390x.rpm
perf-debuginfo-2.6.32-696.6.3.el6.s390x.rpm
python-perf-2.6.32-696.6.3.el6.s390x.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.s390x.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.6.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
python-perf-2.6.32-696.6.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
kernel-2.6.32-696.6.3.el6.src.rpm

i386:
kernel-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-devel-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.6.3.el6.i686.rpm
kernel-devel-2.6.32-696.6.3.el6.i686.rpm
kernel-headers-2.6.32-696.6.3.el6.i686.rpm
perf-2.6.32-696.6.3.el6.i686.rpm
perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm

noarch:
kernel-abi-whitelists-2.6.32-696.6.3.el6.noarch.rpm
kernel-doc-2.6.32-696.6.3.el6.noarch.rpm
kernel-firmware-2.6.32-696.6.3.el6.noarch.rpm

x86_64:
kernel-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debug-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debug-devel-2.6.32-696.6.3.el6.i686.rpm
kernel-debug-devel-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.6.3.el6.x86_64.rpm
kernel-devel-2.6.32-696.6.3.el6.x86_64.rpm
kernel-headers-2.6.32-696.6.3.el6.x86_64.rpm
perf-2.6.32-696.6.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

i386:
kernel-debug-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.6.3.el6.i686.rpm
perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm
python-perf-2.6.32-696.6.3.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.i686.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.6.3.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.6.3.el6.x86_64.rpm
python-perf-2.6.32-696.6.3.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.6.3.el6.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-2017-7895
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 2017 Red Hat, Inc.
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