CVE-2018-16843 Denial of service in nginx
Attackers can cause excessive memory consumption in nginx via HTTP/2 requests, leading to denial of service, requiring the optional HTTP/2 module to be enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-16843?
CVE-2018-16843 is a medium-severity denial of service vulnerability in Apple Xcode, published on 7 Nov 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
nginx before versions 1.15.6 and 1.14.1 has a vulnerability in the implementation of HTTP/2 that can allow for excessive memory consumption. This issue affects nginx compiled with the ngx_http_v2_module (not compiled by default) if the 'http2' option of the 'listen' directive is used in a configuration file.
Weakness: CWE-400
Which versions are affected by CVE-2018-16843?
It affects 5 products.
Products include Apple Xcode, Canonical Ubuntu Linux, Debian Debian Linux, F5 Nginx, Opensuse Leap.
How do I fix CVE-2018-16843?
Upgrade to a fixed version.
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-2018-16843 being exploited?
There is no known exploitation of CVE-2018-16843 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Apple Xcode
Sources
Also known as ALPINE-CVE-2018-16843, CLEANSTART-2026-YJ21640, DEBIAN-CVE-2018-16843, GHSA-4p62-4q7w-qmcg, UBUNTU-CVE-2018-16843.