RHEL 7 : kernel (RHSA-2019:1483) (SACK Panic) (SACK Slowness)

high Nessus Plugin ID 125971

Synopsis

The remote Red Hat host is missing one or more security updates.

Description

An update for kernel is now available for Red Hat Enterprise Linux 7.4 Extended Update Support.

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.

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

Security Fix(es) :

* An integer overflow flaw was found in the way the Linux kernel's networking subsystem processed TCP Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel's socket buffer (SKB) data structure becomes fragmented. Each fragment is about TCP maximum segment size (MSS) bytes. To efficiently process SACK blocks, the Linux kernel merges multiple fragmented SKBs into one, potentially overflowing the variable holding the number of segments. A remote attacker could use this flaw to crash the Linux kernel by sending a crafted sequence of SACK segments on a TCP connection with small value of TCP MSS, resulting in a denial of service (DoS).
(CVE-2019-11477)

* kernel: race condition in snd_seq_write() may lead to UAF or OOB-access (CVE-2018-7566)

* kernel: Race condition in sound system can lead to denial of service (CVE-2018-1000004)

* Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service (CVE-2019-11478)

* Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service (CVE-2019-11479)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es) :

* Mistmach between 'tty->termios->c_lflag' and 'ldata->icanon' for 'ICANON' (BZ#1708061)

* RHEL7: rwsem reader/writer mutual exclusion guarantee may not work (BZ# 1709702)

* hardened usercopy is causing crash (BZ#1712311)

* [RHEL7] md_clear flag missing from /proc/cpuinfo on late microcode update (BZ#1712991)

* [RHEL7] MDS mitigations are not enabled after double microcode update (BZ# 1712996)

* WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:90
__static_key_slow_dec+0xa6 /0xb0 (BZ#1713002)

* [debug kernel] [x86_64]INFO: possible circular locking dependency detected (BZ#1715326)

* RHEL-7.7: tty: termios_rwsem possible deadlock (BZ#1715329)

Enhancement(s) :

* [MCHP 7.7 FEAT] Update smartpqi driver to latest upstream (BZ#1709467)

Solution

Update the affected packages.

See Also

https://access.redhat.com/security/cve/cve-2019-11477

https://access.redhat.com/security/cve/cve-2019-11478

https://access.redhat.com/security/cve/cve-2019-11479

https://access.redhat.com/security/vulnerabilities/tcpsack

https://access.redhat.com/errata/RHSA-2019:1483

https://access.redhat.com/security/cve/cve-2018-7566

https://access.redhat.com/security/cve/cve-2018-1000004

Plugin Details

Severity: High

ID: 125971

File Name: redhat-RHSA-2019-1483.nasl

Version: 1.8

Type: local

Agent: unix

Published: 6/18/2019

Updated: 12/5/2022

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2018-7566

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:kernel, p-cpe:/a:redhat:enterprise_linux:kernel-abi-whitelists, p-cpe:/a:redhat:enterprise_linux:kernel-debug, p-cpe:/a:redhat:enterprise_linux:kernel-debug-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-debug-devel, p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo-common-s390x, p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo-common-x86_64, p-cpe:/a:redhat:enterprise_linux:kernel-devel, p-cpe:/a:redhat:enterprise_linux:kernel-doc, p-cpe:/a:redhat:enterprise_linux:kernel-headers, p-cpe:/a:redhat:enterprise_linux:kernel-kdump, p-cpe:/a:redhat:enterprise_linux:kernel-kdump-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-kdump-devel, p-cpe:/a:redhat:enterprise_linux:kernel-tools, p-cpe:/a:redhat:enterprise_linux:kernel-tools-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-tools-libs, p-cpe:/a:redhat:enterprise_linux:kernel-tools-libs-devel, p-cpe:/a:redhat:enterprise_linux:perf, p-cpe:/a:redhat:enterprise_linux:perf-debuginfo, p-cpe:/a:redhat:enterprise_linux:python-perf, p-cpe:/a:redhat:enterprise_linux:python-perf-debuginfo, cpe:/o:redhat:enterprise_linux:7.4

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 6/17/2019

Vulnerability Publication Date: 1/16/2018

Reference Information

CVE: CVE-2018-1000004, CVE-2018-7566, CVE-2019-11477, CVE-2019-11478, CVE-2019-11479

RHSA: 2019:1483