[ASA-201808-4] linux: denial of service
anthraxx at archlinux.org
Wed Aug 8 18:22:08 UTC 2018
Arch Linux Security Advisory ASA-201808-4
Date : 2018-08-08
CVE-ID : CVE-2018-5390
Package : linux
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-747
The package linux before version 4.17.11-1 is vulnerable to denial of
Upgrade to 4.17.11-1.
# pacman -Syu "linux>=4.17.11-1"
The problem has been fixed upstream in version 4.17.11.
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 remote attacker is able to saturate the CPU and hence cause a denial
of service on the host system by sending specially modified packets
within ongoing TCP sessions.
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