CVE-2018-0173
CVE-2018-0173
En resumen
Los dispositivos Cisco IOS no validan correctamente la información DHCP option 82 en respuestas de servidores, permitiendo que un atacante envíe paquetes manipulados que bloqueen el dispositivo.
Detalle técnico
La vulnerabilidad proviene de validación incompleta (CWE-20) de la opción 82 DHCP encapsulada en mensajes DHCPv4 DHCPOFFER. Un atacante remoto no autenticado puede explotarla enviando un paquete DHCPv4 malicioso que el dispositivo afectado reenvía al servidor DHCP; el procesamiento inadecuado de la respuesta del servidor causa reinicio del dispositivo, resultando en negación de servicio de la funcionalidad de retransmisión DHCP.
Resumen generado y traducido por IA a partir de la descripción oficial.
A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a Relay Reply denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of encapsulated option 82 information that it receives in DHCPOFFER messages from DHCPv4 servers. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device, which the device would then forward to a DHCPv4 server. When the affected software processes the option 82 information that is encapsulated in the response from the server, an error could occur. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvg62754.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Productos afectados
n/a · Cisco IOS and IOS XE¿Quieres saber si tu infraestructura está expuesta a esto?
Hablar con TrueHacking →Referencias
https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr2https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0173https://www.tenable.com/security/research/tra-2018-06http://www.securityfocus.com/bid/103545http://www.securitytracker.com/id/1040591