** Changed in: isc-dhcp (Debian)
Status: New => Fix Released
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Title:
DHCPv6 server crashes regularly (bionic)
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 heap
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 heap
Great, thanks for testing, I'll release these early next week!
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Title:
DHCPv6 server crashes regularly (bionic)
Sta
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.
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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:
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
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 r
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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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
Importance
#12: I have, just now. RT #48804.
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Title:
DHCPv6 server crashes regularly (bionic)
Status in isc-dhcp package in Ub
Has anybody filed an upstream bug about this at
https://www.isc.org/community/report-bug/ ?
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Title:
DHCPv6 server cr
@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 pro
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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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
Still not fixed :-(
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Title:
DHCPv6 server crashes regularly (bionic)
Status in isc-dhcp package in Ubuntu:
Confir
Is there now a forecast when a fix will be available in Ubuntu?
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Title:
DHCPv6 server crashes regularly (bionic)
St
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
~brian-
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 1
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
** Changed in: isc-dhcp (Debian)
Status: Unknown => New
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Title:
DHCPv6 server crashes regularly (bionic)
Sta
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
https://bugs.debian.org/cgi-bin/bugrepo
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: isc-dhcp (Ubuntu)
Status: New => Confirmed
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