CVE-2023-45235

EDK2's Network Package es susceptible a una vulnerabilidad de desbordamiento de búfer cuando maneja la opción de ID del servidor desde un mensaje de publicidad del proxy DHCPv6. Un atacante puede aprovechar esta vulnerabilidad para obtener acceso no autorizado y potencialmente provocar una pérdida de confidencialidad, integridad y/o disponibilidad.

A security flaw involving buffer overflow was identified in EDK2, the open-source reference implementation of the UEFI specification. This vulnerability enables an unauthorized attacker within the vicinity network to transmit a specifically crafted DHCPv6 proxy Advertise message, resulting in the disclosure of information and potential compromise of system availability.

This update for ovmf fixes the following issues. Potential division-by-zero crash in edk2 due to UINT32 overflow in S3 ResumeCount. Out-of-bounds read in edk2 when processing IA_NA/IA_TA options in DHCPv6 Advertise messages. Buffer overflow in the DHCPv6 client in edk2 via a long Server ID option. Out-of-bounds read in edk2 when handling a ND Redirect message with truncated options. Infinite loop in edk2 when parsing unknown options in the Destination Options header. Infinite loop in edk2 when parsing PadN options in the Destination Options header. Buffer overflow in edk2 when processing DNS Servers options in a DHCPv6 Advertise message. Buffer overflow in edk2 when handling the Server ID option in a DHCPv6 proxy Advertise message. Predictable TCP Initial Sequence Numbers in edk2 network packages. Use of a weak pseudorandom number generator in edk2.