CVE-2018-0173: Cisco IOS and IOS XE Software Improper Input Validation Vulnerability
In CISA’s Known Exploited Vulnerabilities catalog: Cisco IOS and IOS XE Software Improper Input Validation Vulnerability.
Added , federal remediation due . Known ransomware use: Unknown.
Required action: Apply updates per vendor instructions.
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.
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H · CWE-20
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Cisco IOS and IOS XE
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- ics-cert.us-cert.gov/advisories/ICSA-18-107-04 (opens in new tab)
- ics-cert.us-cert.gov/advisories/ICSA-18-107-05 (opens in new tab)
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr… (opens in new tab)
- www.tenable.com/security/research/tra-2018-06 (opens in new tab)
- www.securityfocus.com/bid/103545 (opens in new tab)
- www.securitytracker.com/id/1040591 (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)