CVE-2020-16092

En QEMU versiones hasta 5.0.0, puede ocurrir un fallo de aserción en el procesamiento de paquetes de red. Este problema afecta a los dispositivos de red e1000e y vmxnet3. Un usuario y proceso invitado malicioso podría usar este fallo para abortar el proceso QEMU en el host, resultando en una condición de denegación de servicio en la función net_tx_pkt_add_raw_fragment en el archivo hw/net/net_tx_pkt.c

An assertion failure flaw was found in QEMU in the network packet processing component. This issue affects the "e1000e" and "vmxnet3" network devices. This flaw allows a malicious guest user or process to abort the QEMU process on the host, resulting in a denial of service.

Ziming Zhang and VictorV discovered that the QEMU SLiRP networking implementation incorrectly handled replying to certain ICMP echo requests. An attacker inside a guest could possibly use this issue to leak host memory to obtain sensitive information. This issue only affected Ubuntu 18.04 LTS. Eric Blake and Xueqiang Wei discovered that the QEMU NDB implementation incorrectly handled certain requests. A remote attacker could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. Various other issues were also addressed.