CVE-2018-19333 Use after free in n/a

Critical 9.8 Published 17 Nov 2018 Updated 5 Aug 2024

Attackers can overwrite memory in root processes within gVisor sandboxes due to mishandled reference counting in shared memory operations.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-19333?

CVE-2018-19333 is a critical use after free vulnerability in n/a, published on 17 Nov 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

pkg/sentry/kernel/shm/shm.go in Google gVisor before 2018-11-01 allows attackers to overwrite memory locations in processes running as root (but not escape the sandbox) via vectors involving IPC_RMID shmctl calls, because reference counting is mishandled.

Which versions are affected by CVE-2018-19333?

It affects 1 product.

Products include Google Gvisor.

How do I fix CVE-2018-19333?

No fix has been published for CVE-2018-19333 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2018-19333 being exploited?

There is no known exploitation of CVE-2018-19333 in the wild and no public exploit code.

Sources

Also known as GHSA-r6hh-xg5m-g342.