Vulnerability CVE-2018-6922


Published: 2018-08-09

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.

Type:

CWE-399

(Resource Management Errors)

Vendor: Freebsd
Product: Freebsd 
Version:
11.2
11.1
10.4

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial

 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

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