Scientific Linux Security Update : kernel on SL7.x x86_64 (Foreshadow)

High Nessus Plugin ID 111778

Synopsis

The remote Scientific Linux host is missing one or more security updates.

Description

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)

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?e6645d58

Plugin Details

Severity: High

ID: 111778

File Name: sl_20180814_kernel_on_SL7_x.nasl

Version: 1.3

Type: local

Agent: unix

Published: 2018/08/16

Updated: 2018/12/27

Dependencies: 12634

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS v3.0

Base Score: 7.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: x-cpe:/o:fermilab:scientific_linux

Patch Publication Date: 2018/08/14

Reference Information

CVE: CVE-2017-13215, CVE-2018-10675, CVE-2018-3620, CVE-2018-3646, CVE-2018-3693, CVE-2018-5390, CVE-2018-7566