[Kea-announce] CVE-2019-6472: A packet containing a malformed DUID can cause the kea-dhcp6 server to terminate

Michael McNally mcnally at isc.org
Wed Aug 28 21:08:44 UTC 2019


CVE:                 CVE-2019-6472
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
Severity:            Medium

Exploitable:

  From adjacent networks permitted to relay DHCP traffic to the Kea server

Description:

   A packet containing a malformed DUID can cause the Kea DHCPv6
   server process (kea-dhcp6) to exit due to an assertion failure.

Impact:

   An attacker who is able to send a request containing a malformed
   DUID to the server (either directly or via a relay) can cause
   the DHCPv6 server process to terminate, denying service to
   clients.

   Only the DHCPv6 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

Workarounds:

   None.

Active exploits:

   No known active exploits

Solution:

   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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Note:

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   versions are actively supported, please see
   https://www.isc.org/downloads/).

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