CVE-2018-16853 Denial of service in samba
A user in a Samba AD domain can crash the KDC when using the experimental MIT Kerberos build, requiring configuration changes to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-16853?
CVE-2018-16853 is a high-severity denial of service vulnerability in Samba Samba, published on 28 Nov 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Samba from version 4.7.0 has a vulnerability that allows a user in a Samba AD domain to crash the KDC when Samba is built in the non-default MIT Kerberos configuration. With this advisory the Samba Team clarify that the MIT Kerberos build of the Samba AD DC is considered experimental. Therefore the Samba Team will not issue security patches for this configuration. Additionally, Samba 4.7.12, 4.8.7 and 4.9.3 have been issued as security releases to prevent building of the AD DC with MIT Kerberos unless --with-experimental-mit-ad-dc is specified to the configure command.
Weakness: CWE-400
Which versions are affected by CVE-2018-16853?
It affects 1 product.
Products include Samba Samba.
How do I fix CVE-2018-16853?
Change a configuration setting.
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-2018-16853 being exploited?
There is no known exploitation of CVE-2018-16853 in the wild and no public exploit code.
Other vulnerabilities in Samba Samba
Sources
Also known as ALPINE-CVE-2018-16853, DEBIAN-CVE-2018-16853, ECHO-ad76-9b08-2235, GHSA-wggh-6fmq-953v.