CVE-2018-6918 Denial of service in FreeBSD
A remote attacker can crash the system by sending a crafted packet with a zero-length IPsec option header, causing an infinite loop.
- 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-2018-6918?
CVE-2018-6918 is a high-severity denial of service vulnerability in Freebsd Freebsd, published on 4 Apr 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In FreeBSD before 11.1-STABLE, 11.1-RELEASE-p9, 10.4-STABLE, 10.4-RELEASE-p8 and 10.3-RELEASE-p28, the length field of the ipsec option header does not count the size of the option header itself, causing an infinite loop when the length is zero. This issue can allow a remote attacker who is able to send an arbitrary packet to cause the machine to crash.
Weakness: CWE-835
Which versions are affected by CVE-2018-6918?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2018-6918?
No fix has been published for CVE-2018-6918 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-2018-6918 being exploited?
There is no known exploitation of CVE-2018-6918 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as GHSA-v4xf-p7r4-pfpq.