This would take place as far as possible during the off-peak hours. A reboot is required to complete the upgrade. The downtime should not exceed 30 minutes and it will be minimize as much as possible.
This update is scheduled as follows:
Date: 16 May 2015 (Saturday) to 18 May 2015 (Monday)
Time: Between 2AM and 8AM EST#
Details of CentOS 6 security update
* A flaw was found in the way seunshare, a utility for running executables under a different security context, used the capng_lock functionality of the libcap-ng library. The subsequent invocation of suid root binaries that relied on the fact that the setuid() system call, among others, also sets the saved set-user-ID when dropping the binaries' process privileges, could allow a local, unprivileged user to potentially escalate their privileges on the system. Note: the fix for this issue is the kernel part of the overall fix, and introduces the PR_SET_NO_NEW_PRIVS functionality and the related SELinux exec transitions support. (CVE-2014-3215, Important)
* A use-after-free flaw was found in the way the Linux kernel's SCTP implementation handled authentication key reference counting during INIT collisions. A remote attacker could use this flaw to crash the system or, potentially, escalate their privileges on the system. (CVE-2015-1421, Important)
* It was found that the Linux kernel's KVM implementation did not ensure that the host CR4 control register value remained unchanged across VM entries on the same virtual CPU. A local, unprivileged user could use this flaw to cause a denial of service on the system. (CVE-2014-3690, Moderate)
* An out-of-bounds memory access flaw was found in the syscall tracing functionality of the Linux kernel's perf subsystem. A local, unprivileged user could use this flaw to crash the system. (CVE-2014-7825, Moderate)
* An out-of-bounds memory access flaw was found in the syscall tracing functionality of the Linux kernel's ftrace subsystem. On a system with ftrace syscall tracing enabled, a local, unprivileged user could use this flaw to crash the system, or escalate their privileges. (CVE-2014-7826, Moderate)
* It was found that the Linux kernel memory resource controller's (memcg) handling of OOM (out of memory) conditions could lead to deadlocks. An attacker able to continuously spawn new processes within a single
memory-constrained cgroup during an OOM event could use this flaw to lock up the system. (CVE-2014-8171, Moderate)
* A race condition flaw was found in the way the Linux kernel keys management subsystem performed key garbage collection. A local attacker could attempt accessing a key while it was being garbage collected, which would cause the system to crash. (CVE-2014-9529, Moderate)
* A stack-based buffer overflow flaw was found in the TechnoTrend/Hauppauge DEC USB device driver. A local user with write access to the corresponding device could use this flaw to crash the kernel or, potentially, elevate
their privileges on the system. (CVE-2014-8884, Low)
* An information leak flaw was found in the way the Linux kernel's ISO9660 file system implementation accessed data on an ISO9660 image with RockRidge Extension Reference (ER) records. An attacker with physical access to the system could use this flaw to disclose up to 255 bytes of kernel memory. (CVE-2014-9584, Low)
This update also fixes several bugs.
Details of CentOS 5 security update
* It was found that the Linux kernel's Infiniband subsystem did not properly sanitize input parameters while registering memory regions from user space via the (u)verbs API. A local user with access to a /dev/infiniband/uverbsX device could use this flaw to crash the system or, potentially, escalate their privileges on the system. (CVE-2014-8159, Important)
* An insufficient bound checking flaw was found in the Xen hypervisor's implementation of acceleration support for the "REP MOVS" instructions. A privileged HVM guest user could potentially use this flaw to crash the host. (CVE-2014-8867, Important)
Red Hat would like to thank Mellanox for reporting CVE-2014-8159, and the Xen project for reporting CVE-2014-8867.
This update also fixes the following bugs:
* Under memory pressure, cached data was previously flushed to the backing server using the PID of the thread responsible for flushing the data in the Server Message Block (SMB) headers instead of the PID of the thread which
actually wrote the data. As a consequence, when a file was locked by the writing thread prior to writing, the server considered writes by the thread flushing the pagecache as being a separate process from writing to a locked file, and thus rejected the writes. In addition, the data to be written was discarded. This update ensures that the correct PID is sent to the server, and data corruption is avoided when data is being written from a client under memory pressure. (BZ#1169304)
* This update adds support for new cryptographic hardware in toleration mode for IBM System z. (BZ#1182522)
Sexta-feira, Mai 15, 2015
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