CVE-2018-20749 Memory corruption in n/a

What is CVE-2018-20749?

CVE-2018-20749 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 a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The fix for CVE-2018-15127 was incomplete.

Weakness: CWE-787

Which versions are affected by CVE-2018-20749?

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-2018-20749?

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-2018-20749 being exploited?

There is no known exploitation of CVE-2018-20749 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-2018-20749, GHSA-r6jv-7mgh-x66r, UBUNTU-CVE-2018-20749.