[ASA-201808-7] linux-hardened: denial of service
anthraxx at archlinux.org
Wed Aug 8 18:24:07 UTC 2018
Arch Linux Security Advisory ASA-201808-7
Date : 2018-08-08
CVE-ID : CVE-2018-5390
Package : linux-hardened
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-750
The package linux-hardened before version 4.17.11.a-1 is vulnerable to
denial of service.
Upgrade to 4.17.11.a-1.
# pacman -Syu "linux-hardened>=4.17.11.a-1"
The problem has been fixed upstream in version 4.17.11.a.
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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