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CVE-2019-6470

Published: 03 May 2019

There had existed in one of the ISC BIND libraries a bug in a function that was used by dhcpd when operating in DHCPv6 mode. There was also a bug in dhcpd relating to the use of this function per its documentation, but the bug in the library function prevented this from causing any harm. All releases of dhcpd from ISC contain copies of this, and other, BIND libraries in combinations that have been tested prior to release and are known to not present issues like this. Some third-party packagers of ISC software have modified the dhcpd source, BIND source, or version matchup in ways that create the crash potential. Based on reports available to ISC, the crash probability is large and no analysis has been done on how, or even if, the probability can be manipulated by an attacker. Affects: Builds of dhcpd versions prior to version 4.4.1 when using BIND versions 9.11.2 or later, or BIND versions with specific bug fixes backported to them. ISC does not have access to comprehensive version lists for all repackagings of dhcpd that are vulnerable. In particular, builds from other vendors may also be affected. Operators are advised to consult their vendor documentation.

Priority

Medium

CVSS 3 base score: 7.5

Status

Package Release Status
isc-dhcp
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.3.5-3ubuntu7.1)
Ubuntu 16.04 ESM (Xenial Xerus) Not vulnerable

Ubuntu 14.04 ESM (Trusty Tahr) Not vulnerable

Patches:
Upstream: https://bugs.isc.org/Public/Ticket/Attachment/534989/331007/46719.v4_3.diff
Upstream: https://source.isc.org/cgi-bin/gitweb.cgi?p=dhcp.git;a=commit;h=abacf8ad0d8844685e5cd76645a34ef2b8da3253

Notes

AuthorNote
mdeslaur
issue in isc-dhcp was introduced by the following change in
bind in bionic+:
https://gitlab.isc.org/wpk/bind9/commit/65a483106e45704e19781bfe4f4634db4f77562e

References

Bugs