EulerOS 2.0 SP2 : kernel (EulerOS-SA-2018-1278)
High Nessus Plugin ID 112237
SynopsisThe remote EulerOS host is missing multiple security updates.
DescriptionAccording to the versions of the kernel packages installed, the
EulerOS installation on the remote host is affected by the following
- 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.
- 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.
- 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)
Note that Tenable Network Security has extracted the preceding
description block directly from the EulerOS security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.
SolutionUpdate the affected kernel packages.