bhyve privileged guest escape via fwctl

The fwctl driver implements a state machine which is executed when a bhyve guest accesses certain x86 I/O ports. The interface lets the guest copy a string into a buffer resident in the bhyve process' memory. A bug in the state machine implementation can result in a buffer overflowing when copying this string. Malicious, privileged software running in a guest VM can exploit the buffer overflow to achieve code execution on the host in the bhyve userspace process, which typically runs as root, mitigated by the capabilities assigned through the Capsicum sandbox available to the bhyve process.

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未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)

FreeBSD 安全漏洞

FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD 13.1版本和13.2版本存在安全漏洞，该漏洞源于fwctl driver状态机存在缓冲区溢出漏洞。攻击者可利用该漏洞在主机的bhyve用户空间进程中以root身份执行任意代码。

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