[El-errata] New Ksplice updates for Oracle Enhanced RHCK 7 (ELSA-2017-1842-1)

[Errata Announcements for Oracle Linux]

Synopsis: ELSA-2017-1842-1 can now be patched using Ksplice
CVEs: CVE-2014-7970 CVE-2014-7975 CVE-2015-8970 CVE-2016-10088 CVE-2016-10200 CVE-2016-3713 CVE-2016-6213 CVE-2016-7042 CVE-2016-7097 CVE-2016-8645 CVE-2016-9576 CVE-2016-9588 CVE-2016-9604 CVE-2016-9685 CVE-2016-9806 CVE-2017-2596 CVE-2017-2647 CVE-2017-2671 CVE-2017-5970 CVE-2017-6001 CVE-2017-6951 CVE-2017-7187 CVE-2017-7616 CVE-2017-7889 CVE-2017-8797 CVE-2017-8890 CVE-2017-9074 CVE-2017-9075 CVE-2017-9076 CVE-2017-9077 CVE-2017-9242

Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Security Advisory, ELSA-2017-1842-1.

NOTICE

Ksplice will not be providing zero-downtime updates for CVE-2015-8839,
CVE-2015-8970 and CVE-2016-10147. Customers requiring fixes for these
issues should reboot into 3.10.0-693.el7 or later. CVE-2016-10147 may be
mitigated by blacklisting the "mcryptd" kernel module from loading.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running Oracle Enhanced
RHCK 7 install these updates.

On systems that have "autoinstall = yes" in /etc/uptrack/uptrack.conf,
these updates will be installed automatically and you do not need to
take any action.

Alternatively, you can install these updates by running:

# /usr/sbin/uptrack-upgrade -y


DESCRIPTION

* CVE-2014-7970: Memory corruption when using pivot_root.

A flaw in the pivot_root syscall leads to a corruption of the mount tree
when calling with a directory outside a chroot. A local user could use this
flaw to cause a memory corruption and likely a denial-of-service.


* CVE-2015-8970: Denial-of-service when accepting userspace cryptographic sockets.

A logic error in the kernel cryptographic subsystem can allow a
unprivileged user to trigger a denial of service by calling accept(2) on
PF_ALG socket before setting a cryptographic key.


* CVE-2016-10200: Denial-of-service when creating L2TP sockets using concurrent thread.

A missing check when creating L2TP socket could lead to a use-after-free
if a concurrent thread modify socket's flag while creating it. An attacker
could use this flaw to cause a denial-of-service.


* CVE-2016-3713: Privilege escalation in KVM MTRR emulation.

Incorrect validation of emulated MTRR MSRs can allow a guest VM to read
and write memory in the KVM host. This may allow a privileged guest to
gain code execution in the KVM host.


* CVE-2016-7042: Stack corruption when reading keys from proc filesystem.

An on-stack buffer is not big enough to hold the data being written to it
when reading keys from the proc filesystem, potentially leading to a kernel
panic when the stack protector is in use.  A local, unprivileged user could
use this flaw to cause a denial-of-service.


* CVE-2016-8645: Denial of service when receiving TCP packet.

When collapsing multiple socket buffers into one, a bug in the code
could result in kernel panic. A remote attacker can trigger this by
sending specially crafted packets and cause denial of service.


* CVE-2016-10088, CVE-2016-9576: Use-after-free in SCSI device interface.

Incorrect validation of sendfile arguments can cause a use-after-free in
the SCSI subsystem. A local user with access to /dev/sg* devices could
use this flaw to read kernel memory or escalate privileges.


* CVE-2016-9588: Denial-of-service in Intel nested VMX exception handling.

Failure to handle exceptions thrown by an L2 guest could result in
kernel crash.  A malicious guest could use this flaw to crash the
virtualization host.


* CVE-2016-9604: Permission bypass when creating key using keyring subsystem.

A missing check when an user create a key beginning with '.' could lead
to a permission bypass. A local attacker could use this flaw to access
sensitive information.


* CVE-2016-9685: Memory leak in XFS filesystem operations.

Multiple memory leaks in error paths in fs/xfs/xfs_attr_list.c in the
Linux kernel before 4.5.1 allow local users to cause a denial of service
(memory consumption) via crafted XFS filesystem operations.


* CVE-2016-7097: Permission bypass in Overlay filesystem when setting POSIX ACLs.

A logic error when setting POSIX ACLs in the Overlay filesystem causes
the set-group-ID to not be cleared.  A local, unprivileged user could
use this flaw to escalate privileges.


* CVE-2016-6213: Denial-of-service when bind mounting filesystems.

A missing limit could cause an overflow of the mount table. A user with
mount permissions could cause a denial-of-service by bind mounting many
filesystems and overflowing the mount table.


* CVE-2016-9806: Use after free in netlink dump interface.

Incorrect locking in the generic netlink interface can cause a use after
free and kernel panic when attempting to dump multiple interfaces
concurrently.


* CVE-2017-2596: Memory leak in KVM VMXON emulated instruction.

When processing a VMXON instruction for a guest machine, the reference
count of the emulated VMXON memory region could be over-incremented,
resulting in a leak of the region and eventual denial-of-service


* CVE-2017-2647: Denial-of-service when invoking request_key() syscall.

A missing check in request_key() syscall could lead to a NULL pointer
dereference. A local unprivileged user could use this flaw to cause a
denial-of-service.


* CVE-2017-2671: Use-after-free in ping implementation.

A race condition in the kernel ping implementation can result in a
use-after-free. A local attacker with access to ping sockets could use
this flaw to cause a kernel crash or escalate privileges.


* CVE-2017-5970: Denial-of-service in ipv4 options field handling.

Incorrect behaviour when ipv4 options are used can result in a kernel
crash.  A local attacker could use this flaw to cause a
denial-of-service.


* CVE-2017-6951: Denial-of-service from userspace via dead security keys.

Dead security keys were improperly assigned a type with name "dead",
which allowed them to be accessed by users with the
key_get_type_from_user() syscall, causing a kernel panic and
denial-of-service.


* CVE-2017-7187: Denial-of-service in SCSI driver ioctl handler.

The ioctl handler function in SCSI driver allows local users to cause a
denial of service (stack-based buffer overflow) or possibly have
unspecified other impact via a large command size in an SG_NEXT_CMD_LEN
ioctl call, leading to out-of-bounds write access in the sg_write
function.


* CVE-2017-7616: Information leak when setting memory policy.

A missing check when setting memory policy through set_mempolicy()
syscall could lead to a stack data leak. A local attacker could use this
flaw to leak information about running kernel and facilitate an attack.


* CVE-2017-7889: Permissions bypass via /dev/mem file.

The mm subsystem does not properly enforce the CONFIG_STRICT_DEVMEM
protection mechanism, which allows local users to read or write to
kernel memory locations via an application that opens the /dev/mem file.


* CVE-2017-9074: Information leak via ipv6 fragment header.

The header size of an ipv6 fragment is not properly checked, potentially
allowing an attacker to read out-of-bounds memory when attempting to
parse it, leaking information.


* CVE-2017-8890, CVE-2017-9076, CVE-2017-9077: Incorrectly copying list headers on socket clone causes denial-of-service.

When cloning sockets, several list headers are incorrectly copied to the
child sockets, which then leads to double-frees when both sockets are
closed, causing a kernel panic and denial-of-service.


* CVE-2017-9075: Denial-of-service in SCTP IPv6 socket inheritance.

A failure to correctly initialize an SCTP socket during an accept() call
can later result in a double-free. A local, unprivileged attacker could
use this flaw to cause memory corruption or a kernel crash, resulting in
a denial-of-service.


* CVE-2017-9242: Out-of-bounds access in IPv6 packet transmission.

A logic error when aggregating IPv6 packets for transmission can result
in an out-of-bounds memory access. A local unprivileged attacker could
use this flaw to cause a denial-of-service.


* CVE-2014-7975: Denial-of-service in do_umount.

A missing capability check in do_umount allows unprivileged local users to
remount the root file system read-only, causing a denial-of-service (loss
of writability).


* CVE-2017-8797: Remote denial-of-service when handling layout requests in NFSd.

Use of potentially uninitialized values as callback pointer when handling a
layout request in the NFSv4 Daemon with pNFS support could lead to a
denial-of-service or remote kernel execution.  A remote NFS client could
use specifally crafted requests to cause a kernel denial-of-service or
escalate privileges.


* CVE-2017-6001: Use-after-free in the perf subsystem on concurrent perf_event_open.

Incorrect locking in the perf subsystem could lead to a use-after-free on
concurrent perf_event_open().  A local unprivileged user could use this
flaw to potentially elevate privileges depending on the perf_event paranoid
setting.

SUPPORT

Ksplice support is available at ksplice-support_ww at oracle.com.