CVE-2018-6922 Information

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Reference

http://www.securityfocus.com/bid/105058 http://www.securitytracker.com/id/1041425 https://security.netapp.com/advisory/ntap-20180815-0002/ https://www.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.asc https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

LOW

Base Severity

5.3