Rapid7 Vulnerability & Exploit Database

FreeBSD: VID-3C2EEA8C-99BF-11E8-8BEE-A4BADB2F4699 (CVE-2018-6922): FreeBSD -- Resource exhaustion in TCP reassembly

Back to Search

FreeBSD: VID-3C2EEA8C-99BF-11E8-8BEE-A4BADB2F4699 (CVE-2018-6922): FreeBSD -- Resource exhaustion in TCP reassembly

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
08/06/2018
Created
03/19/2019
Added
08/07/2018
Modified
05/07/2019

Description

One of the data structures that holds TCP segments in all versions of FreeBSD prior to 11.2-RELEASE-p1, 11.1-RELEASE-p12, and 10.4-RELEASE-p10 uses an inefficient algorithm to reassemble the data. This causes the CPU time spent on segment processing to grow linearly with the number of segments in the reassembly queue. An attacker who has the ability to send TCP traffic to a victim system can degrade the victim system's network performance and/or consume excessive CPU by exploiting the inefficiency of TCP reassembly handling, with relatively small bandwidth cost.

Solution(s)

  • freebsd-upgrade-base-10_4-release-p10
  • freebsd-upgrade-base-11_1-release-p12
  • freebsd-upgrade-base-11_2-release-p1

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;