Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2018-6922

Severity CVSS v4.0:
Pending analysis
Type:
CWE-400 Uncontrolled Resource Consumption ('Resource Exhaustion')
Publication date:
09/08/2018
Last modified:
09/10/2019

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.

Impact

Vector 3.x
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS v3.1 Severity and Metrics:

Base Score: 5.30 MEDIUM
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): Low

Base Score 3.x
5.30
Severity 3.x
MEDIUM
Vector 2.0
AV:N/AC:L/Au:N/C:N/I:N/A:P CVSS v2.0 Severity and Metrics:

Base Score: 5.00 MEDIUM
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Physical

Base Score 2.0
5.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:freebsd:freebsd:10.4:-:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:10.4:p1:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:10.4:p3:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:10.4:p4:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:10.4:p5:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:10.4:p6:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:10.4:p7:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:10.4:p8:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:10.4:p9:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:11.1:-:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:11.1:p1:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:11.1:p11:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:11.1:p2:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:11.1:p4:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:11.1:p5:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools