Improper input validation in Cisco IOS XE - CVE-2018-0173

Vulnerability identifier: #VU11362

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-0173

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: The vulnerability is being exploited in the wild

The vulnerability allows a remote unauthenticated attacker to cause DoS condition on the target system.

The weakness exists in the function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets due to incomplete input validation of encapsulated option 82 information that it receives in DHCPOFFER messages from DHCPv4 servers. A remote attacker can send a specially crafted DHCPv4 packet and cause the service to crash.

Cisco IOS XE

Allen-Bradley Stratix 8300 Modular Managed Ethernet Switches
Allen-Bradley Stratix 5400 Industrial Ethernet Switches
Allen-Bradley Stratix 5410 Industrial Distribution Switches
Allen-Bradley Stratix 5700 Industrial Managed Ethernet Switches
Allen-Bradley ArmorStratix 5700 Industrial Managed Ethernet Switches
Allen-Bradley Stratix 8000 Modular Managed Ethernet Switches

Update to evrsions 16.6(2.67), 16.5(1.321), 16.3(5.73), 15.6(2.18)SP3, 15.6(2)SP4, 15.5(3)S6.23, 15.4(3)S9, 15.2(6.5.1i)E1, 15.2(6.4.66i)E1, 15.2(6.4.63i)E1, 15.2(6)E1, 15.2(4.7.6)EA7, 15.0(1.9.1)SQD8 or 12.2(60)EZ13.

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr2

• Multiple vulnerabilities in Cisco IOS XE
• Multiple vulnerabilities in Rockwell Automation Stratix and ArmorStratix Switches
• Multiple vulnerabilities in Rockwell Automation Allen-Bradley Stratix 8300 Industrial Managed Ethernet Switches