** Changed in: isc-dhcp (Debian)
Status: New => Fix Released
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Title:
DHCPv6 server crashes regularly (bionic)
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This bug was fixed in the package isc-dhcp - 4.3.5-3ubuntu9.1
---
isc-dhcp (4.3.5-3ubuntu9.1) cosmic-security; urgency=medium
* SECURITY UPDATE: DoS via change in bind behaviour (LP: #1781699)
- debian/patches/CVE-2019-6470.patch: use 0 instead of -1 to indicate
empty
This bug was fixed in the package isc-dhcp - 4.3.5-3ubuntu7.1
---
isc-dhcp (4.3.5-3ubuntu7.1) bionic-security; urgency=medium
* SECURITY UPDATE: DoS via change in bind behaviour (LP: #1781699)
- debian/patches/CVE-2019-6470.patch: use 0 instead of -1 to indicate
empty
Great, thanks for testing, I'll release these early next week!
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Title:
DHCPv6 server crashes regularly (bionic)
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Thanks for your work, Alex, Andreas and Marc! I can confirm that isc-
dhcp-server 4.3.5-3ubuntu7.1 has been running for two days while the
previous version crashed every few hours in my environment.
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I have tested the -server package on Bionic and I haven't had any
crashes yet. Typically in my environment it would have crashed after one
hour or two hours the latest.
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I have the packages in for testing, though repro may take some time to
occur organically. I also think it might be prudent to add a Restart
=on-failure directive to the systemd units regardless of whether the fix
for this issue is effective, so that future bugs don't take down users'
networks.
Packages for this issue are now available in the security team test ppa
here:
https://launchpad.net/~ubuntu-security-
proposed/+archive/ubuntu/ppa/+packages
Could someone please try them out and make sure they resolve the issue?
Thanks!
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** Also affects: isc-dhcp (Ubuntu Eoan)
Importance: High
Status: Triaged
** Also affects: isc-dhcp (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: isc-dhcp (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Also affects: isc-dhcp (Ubuntu Disco)
This has been assigned CVE-2019-6470
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2019-6470
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Title:
DHCPv6 server crashes
Thanks Alex, let's see if the patch changes after the issue is looked at
from a security perspective.
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Title:
DHCPv6 server crashes
Thanks Alex, let's see if the patch changes after the issue is looked at
from a security perspective.
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Title:
DHCPv6 server crashes regularly
This looks like a possible use-after-free so likely has a security
impact (at a minimum it is a denial of service due to the crash,
especially if it can be triggered remotely) - I've reported it to ISC as
such who will hopefully assign a CVE and then we can fix it as a
security update. For future
It is really a shame that the fix of this bug in this basic network
infrastructure package has not made it into the distributions
(especially Ubuntu) after months. :(
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Hello:
This was corrected in ISC DHCP 4.4.1 under:
https://bugs.isc.org/Ticket/Display.html?id=46719#
4.3.* is EOL at this point.
** Bug watch added: bugs.isc.org/ #46719
https://bugs.isc.org/Ticket/Display.html?id=46719
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Thank you, Sebastien. Unfortunately that link is behind a restrictive
access control, so if there indeed is a ISC DHCP bug tracker ID there,
no one has told us here. (ISC can for sure close my ticket as duplicate,
if they are already working on this.)
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** Changed in: isc-dhcp (Ubuntu)
Importance: Undecided => High
** Changed in: isc-dhcp (Ubuntu)
Status: Confirmed => Triaged
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Title:
** Changed in: isc-dhcp (Ubuntu)
Importance: Undecided => High
** Changed in: isc-dhcp (Ubuntu)
Status: Confirmed => Triaged
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There is no debug symbol here but if it's the same issue than the redhat report
then the error tracker bucket for the issue is
https://errors.ubuntu.com/problem/5c6b31248447aaecc5e91304bfd49f40be9eee7b
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Thanks, I linked it to this bug here. Soon someone at isc will unblock
it so it's public.
** Bug watch added: bugs.isc.org/Public/ #48804
https://bugs.isc.org/Public/Ticket/Display.html?id=48804
** Also affects: dhcp via
https://bugs.isc.org/Public/Ticket/Display.html?id=48804
#12: I have, just now. RT #48804.
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Title:
DHCPv6 server crashes regularly (bionic)
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Has anybody filed an upstream bug about this at
https://www.isc.org/community/report-bug/ ?
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Title:
DHCPv6 server crashes regularly (bionic)
To
@radek-zajic I'm not running the patch currently, but I only saw that
crash while running with the patch. If I rebuild using the patch again
I'll grab a stack trace (I've just replaced the machine running DHCP).
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@pdf: would you please mind posting the different crash report? It can
be related to the dirty patch, or there can be another issue. Thanks.
ad restart parameter: that does not help in all cases, for example my
UEFI test machines booting via UEFI PXE+iPXE just hang when they do not
receive the
To those waiting for a fix: I'm using a workaround by setting systemd to
restart the service when it crashes. This works well for me:
$ cat /etc/systemd/system/isc-dhcp-server6.service.d/override.conf
[Service]
Restart=on-abort
RestartSec=1
Run systemctl daemon-reload after creating/changing the
Yes, the problem is certainly exacerbated by the service not having a
Restart parameter, but this needs some real attention. The quick-and-
dirty-patch does reduce the crashes, but results in a different crash
(albeit less frequently).
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Still not fixed :-(
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Title:
DHCPv6 server crashes regularly (bionic)
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Is there now a forecast when a fix will be available in Ubuntu?
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Title:
DHCPv6 server crashes regularly (bionic)
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The attachment "quick-and-dirty-patch" seems to be a patch. If it
isn't, please remove the "patch" flag from the attachment, remove the
"patch" tag, and if you are a member of the ~ubuntu-reviewers,
unsubscribe the team.
[This is an automated message performed by a Launchpad user owned by
Apparently the issue is caused by this commit
https://gitlab.isc.org/wpk/bind9/commit/65a483106e45704e19781bfe4f4634db4f77562e
which fixes a bug in the ISC heap library.
There seems to be a double-deletion of the released addresses in the
dhcpv6 code.
This quick-and-dirty patch helps (on ubuntu
Problem occurs on all our systems after dist upgrade to Ubuntu 18.04.1
LTS (isc-dhcp-server 4.3.5-3ubuntu7). :(
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Title:
DHCPv6 server crashes
** Changed in: isc-dhcp (Debian)
Status: Unknown => New
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Title:
DHCPv6 server crashes regularly (bionic)
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The bug is not present in 16.10 (yakkety, isc-dhcp-
server=4.3.3-5ubuntu15.2). It is present in 17.10, 18.04 (isc-dhcp-
server=4.3.5-3ubuntu7) and 18.10 (isc-dhcp-server=4.3.5-3ubuntu9). Not
sure about 17.04.
** Bug watch added: Debian Bug tracker #896122
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: isc-dhcp (Ubuntu)
Status: New => Confirmed
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