CVE-2018-20748 Memory corruption in n/a
Heap out-of-bounds write in LibVNC client allows attackers to execute arbitrary code or cause denial of service via crafted 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-2018-20748?
CVE-2018-20748 is a critical memory corruption vulnerability in Canonical Ubuntu Linux, published on 30 Jan 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.
Weakness: CWE-787
Which versions are affected by CVE-2018-20748?
It affects 9 products.
Products include Canonical Ubuntu Linux, Debian Debian Linux, Libvnc Project Libvncserver, Siemens Simatic Itc1500 Firmware, Siemens Simatic Itc1500 Pro Firmware, Siemens Simatic Itc1900 Firmware and 3 more.
How do I fix CVE-2018-20748?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2018-20748 being exploited?
There is no known exploitation of CVE-2018-20748 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2018-20748, GHSA-vvj8-j245-7346, UBUNTU-CVE-2018-20748.