CVE-2018-15127 Memory corruption in LibVNC

Critical 9.8 Published 19 Dec 2018 Updated 5 Aug 2024

A heap out-of-bound write in LibVNC's file transfer extension allows remote attackers to execute arbitrary code.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2018-15127?

CVE-2018-15127 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 502821828ed00b4a2c4bef90683d0fd88ce495de contains heap out-of-bound write vulnerability in server code of file transfer extension that can result remote code execution

Weakness: CWE-787

Which versions are affected by CVE-2018-15127?

It affects 9 products.

Linux distribution packages (9)

`libvncserver` Red Hat:enterprise_linux:7::client	All versions	`0:0.9.9-13.el7_6`
`libvncserver-debuginfo` Red Hat:enterprise_linux:7::client	All versions	`0:0.9.9-13.el7_6`
`libvncserver-devel` Red Hat:enterprise_linux:7::client	All versions	`0:0.9.9-13.el7_6`
`libvncserver` Red Hat:enterprise_linux:7::server	All versions	`0:0.9.9-13.el7_6`
`libvncserver-debuginfo` Red Hat:enterprise_linux:7::server	All versions	`0:0.9.9-13.el7_6`
`libvncserver-devel` Red Hat:enterprise_linux:7::server	All versions	`0:0.9.9-13.el7_6`
`libvncserver` Red Hat:enterprise_linux:7::workstation	All versions	`0:0.9.9-13.el7_6`
`libvncserver-debuginfo` Red Hat:enterprise_linux:7::workstation	All versions	`0:0.9.9-13.el7_6`
`libvncserver-devel` Red Hat:enterprise_linux:7::workstation	All versions	`0:0.9.9-13.el7_6`

Products include Canonical Ubuntu Linux, Debian Debian Linux, Libvnc Project Libvncserver, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus and 3 more.

How do I fix CVE-2018-15127?

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-2018-15127 being exploited?

There is no known exploitation of CVE-2018-15127 in the wild and no public exploit code.

All Canonical Ubuntu Linux vulnerabilities

Sources

Also known as DEBIAN-CVE-2018-15127, GHSA-2pgv-ghf3-xj9q, RHSA-2019:0059, UBUNTU-CVE-2018-15127.