- 28 Aug 2019
- 2 Minutes to read
CVE-2019-6473: An invalid hostname option can cause the kea-dhcp4 server to terminate
- Updated on 28 Aug 2019
- 2 Minutes to read
Document Version: 2.0
Posting date: 28 August 2019
Program Impacted: Kea DHCP
Versions affected: 1.4.0 -> 1.5.0. Versions prior to 1.4.0 are considered "End of Life" and have not been tested for this vulnerability, though they are believed to be affected. Also affects development versions 1.6.0-beta1 and 1.6.0-beta2
Exploitable: From adjacent networks permitted to relay DHCP traffic to the Kea server
An invalid hostname option can trigger an assertion failure in the Kea DHCPv4 server process (kea-dhcp4), causing the server process to exit.
An attacker who is able to deliberately exploit this vulnerability can cause the kea-dhcp4 server to stop executing, resulting in denial of service to clients. Only the DHCPv4 service is affected by this vulnerability.
CVSS Score: 6.5
CVSS Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No known active exploits
Upgrade to a version of Kea containing a fix, available via https://www.isc.org/downloads.
- Kea 1.4.0-P2
- Kea 1.5.0-P1
- Kea 1.6.0
Document Revision History:
1.0 Advance Notification, 21 August 2019
2.0 Public disclosure, 28 August 2019
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