Detections
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RHEL 6 : kernel (RHSA-2018:2924)
high Nessus Plugin ID 118163
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Synopsis
The remote Red Hat host is missing one or more security updates for kernel.Description
The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:2924 advisory.The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* 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)
* A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a denial of service on the system. (CVE-2018-5391)
* kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact (CVE-2018-10675)
* kernel: Integer overflow in Linux's create_elf_tables function (CVE-2018-14634)
For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.
Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5390 and CVE-2018-5391 and Qualys Research Labs for reporting CVE-2018-14634.
Bug Fix(es):
* After updating the system to prevent the L1 Terminal Fault (L1TF) vulnerability, only one thread was detected on systems that offer processing of two threads on a single processor core. With this update, the
__max_smt_threads() function has been fixed. As a result, both threads are now detected correctly in the described situation. (BZ#1625334)
* Previously, a kernel panic occurred when the kernel tried to make an out of bound access to the array that describes the L1 Terminal Fault (L1TF) mitigation state on systems without Extended Page Tables (EPT) support. This update extends the array of mitigation states to cover all the states, which effectively prevents out of bound array access. Also, this update enables rejecting invalid, irrelevant values, that might be erroneously provided by the userspace. As a result, the kernel no longer panics in the described scenario. (BZ#1629633)
Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Update the RHEL kernel package based on the guidance in RHSA-2018:2924.See Also
http://www.nessus.org/u?143db380
https://access.redhat.com/articles/3553061
https://access.redhat.com/security/vulnerabilities/mutagen-astronomy
https://bugzilla.redhat.com/show_bug.cgi?id=1575065
https://bugzilla.redhat.com/show_bug.cgi?id=1601704
https://bugzilla.redhat.com/show_bug.cgi?id=1609664
https://bugzilla.redhat.com/show_bug.cgi?id=1624498
https://access.redhat.com/errata/RHSA-2018:2924
https://access.redhat.com/security/updates/classification/#important
Plugin Details
Severity: High
ID: 118163
File Name: redhat-RHSA-2018-2924.nasl
Version: 1.12
Type: local
Agent: unix
Family: Red Hat Local Security Checks
Published: 10/17/2018
Updated: 11/5/2024
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: High
Score: 7.4
Vendor
Vendor Severity: Important
CVSS v2
Risk Factor: High
Base Score: 7.2
Temporal Score: 5.6
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2018-14634
CVSS v3
Risk Factor: High
Base Score: 7.8
Temporal Score: 7
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:P/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:redhat:enterprise_linux:kernel, p-cpe:/a:redhat:enterprise_linux:kernel-headers, p-cpe:/a:redhat:enterprise_linux:kernel-firmware, cpe:/o:redhat:rhel_tus:6.6, p-cpe:/a:redhat:enterprise_linux:kernel-debug-devel, cpe:/o:redhat:rhel_aus:6.6, p-cpe:/a:redhat:enterprise_linux:python-perf, p-cpe:/a:redhat:enterprise_linux:kernel-devel, p-cpe:/a:redhat:enterprise_linux:kernel-debug, p-cpe:/a:redhat:enterprise_linux:perf
Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 10/16/2018
Vulnerability Publication Date: 5/2/2018
Reference Information
CVE: CVE-2018-10675, CVE-2018-14634, CVE-2018-5390, CVE-2018-5391