CVE-2022-23092 Information

Description

The implementation of lib9p’s handling of RWALK messages was missing a bounds check needed when unpacking the message contents. The missing check means that the receipt of a specially crafted message will cause lib9p to overwrite unrelated memory.

The bug can be triggered by a malicious bhyve guest kernel to overwrite memory in the bhyve(8) process. This could potentially lead to user-mode code execution on the host subject to bhyve’s Capsicum sandbox.

Reference

https://security.freebsd.org/advisories/FreeBSD-SA-22:12.lib9p.asc