CVE-2018-6922

Severity Score

5.3

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Una de las estructuras de datos que contienen segmentos TCP en todas las versiones de FreeBSD anteriores a 11.2-RELEASE-p1, 11.1-RELEASE-p12 y 10.4-RELEASE-p10 emplea un algoritmo ineficiente para volver a ensamblar los datos. Esto provoca que el tiempo de CPU que se gasta en el procesamiento de segmentos crezca linealmente con el número de segmentos en la cola de reensamblado. Un atacante que pueda enviar tráfico TCP en un sistema objetivo puede degradar el rendimiento de la red del sistema víctima y/o consumir demasiada CPU explotando la ineficiencia del manejo del reensamblado TCP, con un coste de ancho de banda relativamente pequeño.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-02-12 CVE Reserved
2018-08-07 CVE Published
2024-03-27 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-400: Uncontrolled Resource Consumption

CAPEC

References (5)

URL	Tag	Source
http://www.securityfocus.com/bid/105058	Third Party Advisory
http://www.securitytracker.com/id/1041425	Third Party Advisory
https://security.netapp.com/advisory/ntap-20180815-0002	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://www.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.asc	2019-10-09
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html	2019-10-09

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				10.4 Search vendor "Freebsd" for product "Freebsd" and version "10.4"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				10.4 Search vendor "Freebsd" for product "Freebsd" and version "10.4"		p1		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				10.4 Search vendor "Freebsd" for product "Freebsd" and version "10.4"		p3		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				10.4 Search vendor "Freebsd" for product "Freebsd" and version "10.4"		p4		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				10.4 Search vendor "Freebsd" for product "Freebsd" and version "10.4"		p5		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				10.4 Search vendor "Freebsd" for product "Freebsd" and version "10.4"		p6		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				10.4 Search vendor "Freebsd" for product "Freebsd" and version "10.4"		p7		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				10.4 Search vendor "Freebsd" for product "Freebsd" and version "10.4"		p8		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				10.4 Search vendor "Freebsd" for product "Freebsd" and version "10.4"		p9		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.1 Search vendor "Freebsd" for product "Freebsd" and version "11.1"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.1 Search vendor "Freebsd" for product "Freebsd" and version "11.1"		p1		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.1 Search vendor "Freebsd" for product "Freebsd" and version "11.1"		p11		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.1 Search vendor "Freebsd" for product "Freebsd" and version "11.1"		p2		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.1 Search vendor "Freebsd" for product "Freebsd" and version "11.1"		p4		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.1 Search vendor "Freebsd" for product "Freebsd" and version "11.1"		p5		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.1 Search vendor "Freebsd" for product "Freebsd" and version "11.1"		p6		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.1 Search vendor "Freebsd" for product "Freebsd" and version "11.1"		p7		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.1 Search vendor "Freebsd" for product "Freebsd" and version "11.1"		p9		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				11.2 Search vendor "Freebsd" for product "Freebsd" and version "11.2"		-		Affected