CVE-2018-20019 Memory corruption in LibVNC

What is CVE-2018-20019?

CVE-2018-20019 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 a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can result remote code execution

Weakness: CWE-787

Which versions are affected by CVE-2018-20019?

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-2018-20019?

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-2018-20019 being exploited?

There is no known exploitation of CVE-2018-20019 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2018-20019, GHSA-hgfp-cxw5-j4w8, UBUNTU-CVE-2018-20019.