Vulnerability Monitor

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CVE-2018-0173

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.

Published

2018-03-28T22:29:01.170

Last Modified

2025-01-27T20:08:20.023

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 8.6 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: COMPLETE
Exploitability Score

10.0

Impact Score

6.9

Weaknesses
  • Type: Secondary
    CWE-20
  • Type: Primary
    CWE-20
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System cisco ios denali-16.3.4 Yes
Operating System cisco ios_xe denali-16.3.4 Yes
Hardware cisco 4321_integrated_services_router - No
Hardware cisco 4331_integrated_services_router - No
Hardware cisco 4351_integrated_services_router - No
Hardware cisco 4431_integrated_services_router - No
Hardware cisco 4451-x_integrated_services_router - No
Hardware cisco asr_1000_series_route_processor_\(rp2\) - No
Hardware cisco asr_1000_series_route_processor_\(rp3\) - No
Hardware cisco asr_1001-hx - No
Hardware cisco asr_1001-x - No
Hardware cisco asr_1002-hx - No
Hardware cisco asr_1002-x - No
Hardware cisco cloud_services_router_1000v - No
Operating System cisco ios ≤ 15.2\(6\)e0a Yes
Operating System cisco ios_xe ≤ 15.2\(6\)e0a Yes
Hardware rockwellautomation allen-bradley_armorstratix_5700 - No
Hardware rockwellautomation allen-bradley_stratix_5400 - No
Hardware rockwellautomation allen-bradley_stratix_5410 - No
Hardware rockwellautomation allen-bradley_stratix_5700 - No
Hardware rockwellautomation allen-bradley_stratix_8000 - No
Operating System cisco ios ≤ 15.2\(4a\)ea5 Yes
Operating System cisco ios_xe ≤ 15.2\(4a\)ea5 Yes
Hardware rockwellautomation allen-bradley_stratix_8300 - No
References