Vulnerability Description
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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| 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 | - |
Related Weaknesses (CWE)
References
- http://www.securityfocus.com/bid/103545Broken LinkThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1040591Broken LinkThird Party AdvisoryVDB Entry
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04Third Party AdvisoryUS Government Resource
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05Third Party AdvisoryUS Government Resource
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2Vendor Advisory
- https://www.tenable.com/security/research/tra-2018-06Third Party Advisory
- http://www.securityfocus.com/bid/103545Broken LinkThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1040591Broken LinkThird Party AdvisoryVDB Entry
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04Third Party AdvisoryUS Government Resource
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05Third Party AdvisoryUS Government Resource
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2Vendor Advisory
- https://www.tenable.com/security/research/tra-2018-06Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-US Government Resource
FAQ
What is CVE-2018-0173?
CVE-2018-0173 is a vulnerability with a CVSS score of 8.6 (HIGH). 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 ...
How severe is CVE-2018-0173?
CVE-2018-0173 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-0173?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Ios, Cisco Ios Xe, Cisco 4321 Integrated Services Router, Cisco 4331 Integrated Services Router, Cisco 4351 Integrated Services Router.