CVE-2018-6922 Denial of service in FreeBSD
Remote attackers can cause excessive CPU consumption and network degradation in FreeBSD systems by exploiting inefficient TCP segment reassembly algorithms.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2018-6922?
CVE-2018-6922 is a medium-severity denial of service vulnerability in Freebsd Freebsd, published on 9 Aug 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-400
Which versions are affected by CVE-2018-6922?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2018-6922?
No fix has been published for CVE-2018-6922 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2018-6922 being exploited?
There is no known exploitation of CVE-2018-6922 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as GHSA-hpq2-2fmq-c95r.