CVE-2016-9942 Memory corruption in n/a

Critical 9.8 Published 31 Dec 2016 Updated 6 Aug 2024

A heap-based buffer overflow in LibVNCClient allows remote servers to cause a crash or execute arbitrary code via crafted Ultra type tile messages.

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

What is CVE-2016-9942?

CVE-2016-9942 is a critical memory corruption vulnerability in n/a, published on 31 Dec 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Heap-based buffer overflow in ultra.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message with the Ultra type tile, such that the LZO payload decompressed length exceeds what is specified by the tile dimensions.

Weakness: CWE-119

Which versions are affected by CVE-2016-9942?

It affects 1 product.

Products include Libvncserver Project Libvncserver.

How do I fix CVE-2016-9942?

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-2016-9942 being exploited?

There is no known exploitation of CVE-2016-9942 in the wild and no public exploit code.

Sources

Also known as ALPINE-CVE-2016-9942, DEBIAN-CVE-2016-9942, GHSA-wx7p-737c-9wqw, UBUNTU-CVE-2016-9942.