CVE-2018-17155 Information disclosure in FreeBSD

Medium 5.5 Published 28 Sep 2018 Updated 16 Sep 2024

Unprivileged local users can read small amounts of privileged kernel memory via getcontext and swapcontext system calls.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-17155?

CVE-2018-17155 is a medium-severity vulnerability in Freebsd Freebsd, published on 28 Sep 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In FreeBSD before 11.2-STABLE(r338983), 11.2-RELEASE-p4, 11.1-RELEASE-p15, 10.4-STABLE(r338984), and 10.4-RELEASE-p13, due to insufficient initialization of memory copied to userland in the getcontext and swapcontext system calls, small amounts of kernel memory may be disclosed to userland processes. Unprivileged authenticated local users may be able to access small amounts privileged kernel data.

Weakness: CWE-200

Which versions are affected by CVE-2018-17155?

It affects 1 product.

Products include Freebsd Freebsd.

How do I fix CVE-2018-17155?

No fix has been published for CVE-2018-17155 yet. Limit exposure of the affected software until one is available.

Is CVE-2018-17155 being exploited?

There is no known exploitation of CVE-2018-17155 in the wild and no public exploit code.

All Freebsd Freebsd vulnerabilities

Sources

Also known as GHSA-jghc-cwfr-7hf7.