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IBM AIX: freebsd_advisory (CVE-2018-6922): Vulnerability in FreeBSD affects AIX (Resource exhaustion in TCP reassembly)

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IBM AIX: freebsd_advisory (CVE-2018-6922): Vulnerability in FreeBSD affects AIX (Resource exhaustion in TCP reassembly)

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
08/09/2018
Created
03/19/2019
Added
11/09/2018
Modified
11/13/2018

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.

Solution(s)

  • ibm-aix-freebsd_advisory

References

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