CVE-2018-0173: Cisco IOS and IOS XE Software Improper Input Validation Vulnerability
First published: Wed Mar 28 2018(Updated: )
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.
Credit: ykramarz@cisco.com ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS | =denali-16.3.4 | |
| Cisco IOS XE | =denali-16.3.4 | |
| Cisco 4321 Integrated Services Router | ||
| Cisco 4331 Integrated Services Router | ||
| Cisco 4351 Integrated Services Router | ||
| Cisco 4431 Integrated Services Router | ||
| Cisco 4451-x Integrated Services Router | ||
| Cisco Asr 1000 Series Route Processor \(rp2\) | ||
| Cisco Asr 1000 Series Route Processor \(rp3\) | ||
| Cisco Asr 1001-hx | ||
| Cisco Asr 1001-x | ||
| Cisco Asr 1002-hx | ||
| Cisco Asr 1002-x | ||
| Cisco Cloud Services Router 1000v | ||
| Rockwellautomation Allen-bradley Armorstratix 5700 | ||
| Rockwellautomation Allen-bradley Stratix 5400 | ||
| Rockwellautomation Allen-bradley Stratix 5410 | ||
| Rockwellautomation Allen-bradley Stratix 5700 | ||
| Rockwellautomation Allen-bradley Stratix 8000 | ||
| Rockwellautomation Allen-bradley Stratix 8300 | ||
| All of | ||
| Any of | ||
| Cisco IOS | =denali-16.3.4 | |
| Cisco IOS XE | =denali-16.3.4 | |
| Any of | ||
| Cisco 4321 Integrated Services Router | ||
| Cisco 4331 Integrated Services Router | ||
| Cisco 4351 Integrated Services Router | ||
| Cisco 4431 Integrated Services Router | ||
| Cisco 4451-x Integrated Services Router | ||
| Cisco Asr 1000 Series Route Processor \(rp2\) | ||
| Cisco Asr 1000 Series Route Processor \(rp3\) | ||
| Cisco Asr 1001-hx | ||
| Cisco Asr 1001-x | ||
| Cisco Asr 1002-hx | ||
| Cisco Asr 1002-x | ||
| Cisco Cloud Services Router 1000v | ||
| All of | ||
| Any of | ||
| Cisco IOS | <=15.2\(6\)e0a | |
| Cisco IOS XE | <=15.2\(6\)e0a | |
| Any of | ||
| Rockwellautomation Allen-bradley Armorstratix 5700 | ||
| Rockwellautomation Allen-bradley Stratix 5400 | ||
| Rockwellautomation Allen-bradley Stratix 5410 | ||
| Rockwellautomation Allen-bradley Stratix 5700 | ||
| Rockwellautomation Allen-bradley Stratix 8000 | ||
| All of | ||
| Any of | ||
| Cisco IOS | <=15.2\(4a\)ea5 | |
| Cisco IOS XE | <=15.2\(4a\)ea5 | |
| Rockwellautomation Allen-bradley Stratix 8300 | ||
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Reference Links
- http://www.securityfocus.com/bid/103545
- http://www.securitytracker.com/id/1040591
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr2
- https://www.tenable.com/security/research/tra-2018-06
- https://nvd.nist.gov/vuln/detail/CVE-2018-0173
Frequently Asked Questions
What is CVE-2018-0173?
CVE-2018-0173 is a vulnerability in the Cisco IOS and IOS XE Software function that allows an unauthenticated attacker to cause a denial of service (DoS) by causing an affected device to reload.
What is the severity of CVE-2018-0173?
The severity of CVE-2018-0173 is high with a CVSS score of 8.6.
What devices are affected by CVE-2018-0173?
Cisco IOS and IOS XE Software versions denali-16.3.4 and earlier are affected by CVE-2018-0173.
How can an attacker exploit CVE-2018-0173?
An attacker can exploit CVE-2018-0173 by sending specially crafted DHCPv4 packets with encapsulated option 82 information.
Are the Cisco 4321, 4331, 4351, 4431, and 4451-x Integrated Services Routers affected by CVE-2018-0173?
No, the Cisco 4321, 4331, 4351, 4431, and 4451-x Integrated Services Routers are not vulnerable to CVE-2018-0173.
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- vendor/cisco
- canonical/cisco ios
- version/cisco ios/denali-16.3.4
- canonical/cisco ios xe
- version/cisco ios xe/denali-16.3.4
- canonical/cisco 4321 integrated services router
- canonical/cisco 4331 integrated services router
- canonical/cisco 4351 integrated services router
- canonical/cisco 4431 integrated services router
- canonical/cisco 4451-x integrated services router
- canonical/cisco asr 1000 series route processor \(rp2\)
- canonical/cisco asr 1000 series route processor \(rp3\)
- canonical/cisco asr 1001-hx
- canonical/cisco asr 1001-x
- canonical/cisco asr 1002-hx
- canonical/cisco asr 1002-x
- canonical/cisco cloud services router 1000v
- vendor/rockwellautomation
- canonical/rockwellautomation allen-bradley armorstratix 5700
- canonical/rockwellautomation allen-bradley stratix 5400
- canonical/rockwellautomation allen-bradley stratix 5410
- canonical/rockwellautomation allen-bradley stratix 5700
- canonical/rockwellautomation allen-bradley stratix 8000
- canonical/rockwellautomation allen-bradley stratix 8300
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- version/cisco ios xe/15.2\(6\)e0a
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