CVE-2018-6922

MEDIUM

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.

References

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

Details

Source: MITRE

Published: 2018-08-09

Updated: 2019-10-09

Type: CWE-400

Risk Information

CVSS v2.0

Base Score: 5

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3.0

Base Score: 5.3

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

Impact Score: 1.4

Exploitability Score: 3.9

Severity: MEDIUM