Synopsis:          Important: kernel security and bug fix update

Advisory ID:       SLSA-2018:2384-1

Issue Date:        2018-08-14

CVE Numbers:       CVE-2018-10675

                   CVE-2018-7566

                   CVE-2018-3693

                   CVE-2018-3646

                   CVE-2017-13215

                   CVE-2018-5390

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Security Fix(es):



* Modern operating systems implement virtualization of physical memory to

efficiently use available system resources and provide inter-domain

protection through access control and isolation. The L1TF issue was found

in the way the x86 microprocessor designs have implemented speculative

execution of instructions (a commonly used performance optimisation) in

combination with handling of page-faults caused by terminated virtual to

physical address resolving process. As a result, an unprivileged attacker

could use this flaw to read privileged memory of the kernel or other

processes and/or cross guest/host boundaries to read host memory by

conducting targeted cache side-channel attacks. (CVE-2018-3620,

CVE-2018-3646)



* An industry-wide issue was found in the way many modern microprocessor

designs have implemented speculative execution of instructions past bounds

check. The flaw relies on the presence of a precisely-defined instruction

sequence in the privileged code and the fact that memory writes occur to

an address which depends on the untrusted value. Such writes cause an

update into the microprocessor's data cache even for speculatively

executed instructions that never actually commit (retire). As a result, an

unprivileged attacker could use this flaw to influence speculative

execution and/or read privileged memory by conducting targeted cache side-

channel attacks. (CVE-2018-3693)



* A flaw named SegmentSmack was found in the way the Linux kernel handled

specially crafted TCP packets. A remote attacker could use this flaw to

trigger time and calculation expensive calls to tcp_collapse_ofo_queue()

and tcp_prune_ofo_queue() functions by sending specially modified packets

within ongoing TCP sessions which could lead to a CPU saturation and hence

a denial of service on the system. Maintaining the denial of service

condition requires continuous two-way TCP sessions to a reachable open

port, thus the attacks cannot be performed using spoofed IP addresses.

(CVE-2018-5390)



* kernel: crypto: privilege escalation in skcipher_recvmsg function

(CVE-2017-13215)



* kernel: mm: use-after-free in do_get_mempolicy function allows local DoS

or other unspecified impact (CVE-2018-10675)



* kernel: race condition in snd_seq_write() may lead to UAF or OOB access

(CVE-2018-7566)

--



SL7

  x86_64

    kernel-3.10.0-862.11.6.el7.x86_64.rpm

    kernel-debug-3.10.0-862.11.6.el7.x86_64.rpm

    kernel-debug-debuginfo-3.10.0-862.11.6.el7.x86_64.rpm

    kernel-debug-devel-3.10.0-862.11.6.el7.x86_64.rpm

    kernel-debuginfo-3.10.0-862.11.6.el7.x86_64.rpm

    kernel-debuginfo-common-x86_64-3.10.0-862.11.6.el7.x86_64.rpm

    kernel-devel-3.10.0-862.11.6.el7.x86_64.rpm

    kernel-headers-3.10.0-862.11.6.el7.x86_64.rpm

    kernel-tools-3.10.0-862.11.6.el7.x86_64.rpm

    kernel-tools-debuginfo-3.10.0-862.11.6.el7.x86_64.rpm

    kernel-tools-libs-3.10.0-862.11.6.el7.x86_64.rpm

    perf-3.10.0-862.11.6.el7.x86_64.rpm

    perf-debuginfo-3.10.0-862.11.6.el7.x86_64.rpm

    python-perf-3.10.0-862.11.6.el7.x86_64.rpm

    python-perf-debuginfo-3.10.0-862.11.6.el7.x86_64.rpm

    kernel-tools-libs-devel-3.10.0-862.11.6.el7.x86_64.rpm

    kernel-3.10.0-862.11.6.el7.src.rpm

  noarch

    kernel-abi-whitelists-3.10.0-862.11.6.el7.noarch.rpm

    kernel-doc-3.10.0-862.11.6.el7.noarch.rpm



- Scientific Linux Development Team