CVE-2019-5609

En FreeBSD versiones 12.0-STABLE anteriores a r350619, versiones 12.0-RELEASE anteriores a 12.0-RELEASE-p9, versiones 11.3-STABLE anteriores a r350619, versiones 11.3-RELEASE anteriores a 11.3-RELEASE-p2, y versiones 11.2-RELEASE anteriores a 11.2-RELEASE-p13, la emulación del dispositivo bhyve e1000 utilizó un valor proporcionado por el invitado para determinar el tamaño del búfer en la pila sin comprobación de cuando es requerida la descarga de segmentación TCP para un paquete transmitido. Un invitado bhyve con un comportamiento inapropiado podría sobrescribir la memoria en el proceso bhyve sobre el host.

The e1000 network adapters permit a variety of modifications to an Ethernet packet when it is being transmitted. These include the insertion of IP and TCP checksums, insertion of an Ethernet VLAN header, and TCP segmentation offload ("TSO"). The e1000 device model uses an on-stack buffer to generate the modified packet header when simulating these modifications on transmitted packets. When TCP segmentation offload is requested for a transmitted packet, the e1000 device model used a guest-provided value to determine the size of the on-stack buffer without validation. The subsequent header generation could overflow an incorrectly sized buffer or indirect a pointer composed of stack garbage. A misbehaving bhyve guest could overwrite memory in the bhyve process on the host.