Vulnerability Details CVE-2018-6922
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.007
EPSS Ranking 71.0%
CVSS Severity
CVSS v3 Score 5.3
CVSS v2 Score 5.0
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
- 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