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CVE-2018-6922

Status Candidate

Overview

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.

Related Files

FreeBSD Security Advisory - FreeBSD-SA-18:08.tcp
Posted Aug 7, 2018
Authored by Juha-Matti Tilli | Site security.freebsd.org

FreeBSD Security Advisory - One of the data structures that holds TCP segments 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.

tags | advisory, tcp
systems | freebsd, bsd
advisories | CVE-2018-6922
MD5 | 0bdd64abf1fb28bb2f9ee045a5e2a080
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