CVE-2018-6922 — MEDIUM (5.3)

Vulnerability 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.

CVSS Score

5.3

MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

LOW

Affected Products

Vendor	Product	Versions
Freebsd	Freebsd	10.4

Related Weaknesses (CWE)

CWE-400

References

http://www.securityfocus.com/bid/105058Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041425Third Party AdvisoryVDB Entry
https://security.netapp.com/advisory/ntap-20180815-0002/Third Party Advisory
https://www.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.ascPatchVendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.htmlPatch
http://www.securityfocus.com/bid/105058Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041425Third Party AdvisoryVDB Entry
https://security.netapp.com/advisory/ntap-20180815-0002/Third Party Advisory
https://www.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.ascPatchVendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.htmlPatch

FAQ

What is CVE-2018-6922?

CVE-2018-6922 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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. Thi...

How severe is CVE-2018-6922?

CVE-2018-6922 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2018-6922?

Check the references section above for vendor advisories and patch information. Affected products include: Freebsd Freebsd.