CVE-2018-20020 Memory corruption in LibVNC
A heap out-of-bound write in LibVNC allows remote attackers to execute arbitrary code via malicious VNC server responses.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-20020?
CVE-2018-20020 is a critical memory corruption vulnerability in Canonical Ubuntu Linux, published on 19 Dec 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
LibVNC before commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d contains heap out-of-bound write vulnerability inside structure in VNC client code that can result remote code execution
Weakness: CWE-787
Which versions are affected by CVE-2018-20020?
It affects 3 products.
Products include Canonical Ubuntu Linux, Debian Debian Linux, Libvnc Project Libvncserver.
How do I fix CVE-2018-20020?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2018-20020 being exploited?
There is no known exploitation of CVE-2018-20020 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2018-20020, GHSA-v93r-hw5v-g7wc, UBUNTU-CVE-2018-20020.