CVE-2019-5609 Memory corruption in FreeBSD
A guest VM can overwrite host memory in the bhyve process via TCP segmentation offload, potentially leading to code execution or privilege escalation on the host.
- 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-2019-5609?
CVE-2019-5609 is a high-severity memory corruption vulnerability in Freebsd Freebsd, published on 29 Aug 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In FreeBSD 12.0-STABLE before r350619, 12.0-RELEASE before 12.0-RELEASE-p9, 11.3-STABLE before r350619, 11.3-RELEASE before 11.3-RELEASE-p2, and 11.2-RELEASE before 11.2-RELEASE-p13, the bhyve e1000 device emulation used a guest-provided value to determine the size of the on-stack buffer without validation when TCP segmentation offload is requested for a transmitted packet. A misbehaving bhyve guest could overwrite memory in the bhyve process on the host.
Weakness: CWE-787
Which versions are affected by CVE-2019-5609?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2019-5609?
No fix has been published for CVE-2019-5609 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2019-5609 being exploited?
There is no known exploitation of CVE-2019-5609 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as GHSA-pfg4-gjc6-77cp.