Cisco · IOS and IOS XE Software
CVE-2018-0173
Cisco IOS and IOS XE Software Improper Input Validation Vulnerability
O que é
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.
CISA: 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 can allow for denial-of-service (DoS).
O que fazer
Apply updates per vendor instructions.
Prazo para as agências federais dos EUA: 17 de março de 2022
- Adicionada à lista da CISA
- 3 de março de 2022
- Publicada
- 28 de março de 2018
- Gravidade
- Alto 8,6 CVSS 3.1
- Chance de ataques nos próximos 30 dias (EPSS)
- 7,6% entre os 5,5% mais altos de todas as vulnerabilidades conhecidas
- Fraqueza
- CWE-20
- Mais detalhes
- NVD · CVE.org · CISA
Todas as referências (6)
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr2
- http://www.securityfocus.com/bid/103545
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04
- https://www.tenable.com/security/research/tra-2018-06
- http://www.securitytracker.com/id/1040591
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
Mais falhas exploradas de Cisco
| Adicionado | Vulnerabilidade | Produto | Gravidade | Chance de ataque |
|---|---|---|---|---|
| 19 de abr. de 2023 | SNMP Remote Code Execution | IOS and IOS XE Software | Alto 8,8 | 21% |
| 3 de mar. de 2022 | IOS Software and Cisco IOS XE Software UDP Packet Processing Denial-of-Service | IOS and IOS XE Software | Alto 7,5 | 6,2% |
| 3 de mar. de 2022 | IOS Software and Cisco IOS XE Software Denial-of-Service | IOS and IOS XE Software | Média 6,5 | 2,1% |
| 3 de mar. de 2022 | SNMP Remote Code Execution | IOS and IOS XE Software | Alto 8,8 | 70% |
| 3 de mar. de 2022 | SNMP Remote Code Execution | IOS and IOS XE Software | Alto 8,8 | 45% |
| 3 de mar. de 2022 | SNMP Remote Code Execution | IOS and IOS XE Software | Alto 8,8 | 11% |
| 3 de mar. de 2022 | SNMP Remote Code Execution | IOS and IOS XE Software | Alto 8,8 | 11% |
| 3 de mar. de 2022 | SNMP Remote Code Execution | IOS and IOS XE Software | Alto 8,8 | 11% |
Fontes: Known Exploited Vulnerabilities (CISA, domínio público), CVE records (cve.org) e EPSS (FIRST). A chance de ataque é a estimativa EPSS de que alguém tente explorar a falha nos próximos 30 dias.