-----BEGIN PGP SIGNED MESSAGE-----
AUSCERT External Security Bulletin Redistribution
CVE-2015-8605: UDP payload length not properly checked
14 January 2016
AusCERT Security Bulletin Summary
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2015-8605
- --------------------------BEGIN INCLUDED TEXT--------------------
CVE-2015-8605: UDP payload length not properly checked
12 January 2016
4.0.x, 4.1.x, 4.2.x, 4.1-ESV -> 4.1-ESV-R12, 4.3.0->4.3.3. 3.x may also be
affected but has not been tested.
- From adjacent networks 2001-2015 Internet Systems Consortium
A badly formed packet with an invalid IPv4 UDP length field can cause a DHCP
server, client, or relay program to terminate abnormally.
Nearly all IPv4 DHCP clients and relays, and most IPv4 DHCP servers are
A server, client, or relay that is built to only be able to process unicast
packets (i.e. those that have already been processed by the OS UDP/IP stack)
is not affected, however this build configuration is not normally viable for
clients and relays. Servers with this build configuration require a relay in
order to be able to process DISCOVER and other broadcast requests from
Not all potentially-affected builds will actually be affected, but because it
is difficult to identify or predict those which should be upgraded, our advice
is that all builds should be considered vulnerable.
CVSS Score: 5.7
CVSS Vector: (AV:A/AC:M/Au:N/C:N/I:N/A:C)
For more information on the Common Vulnerability Scoring System and to obtain
your specific environmental score please visit:
None likely, but in some environments following the advice from
can substantially reduce the risk by limiting the exposure of a DHCP server to
"controlled" networks and clients.
No known active exploits.
Solution: Upgrade to the patched release most closely related to your current
version of DHCP. These can all be downloaded from
DHCP version 4.1-ESV-R12-P1
DHCP version 4.3.3-P1
Acknowledgements: Thanks to Sebastian Poehn from Sophos for reporting this
Document Revision History:
1.0 Advance Notification 5 January, 2016
1.1 ESV Version name corrected 12 January 2016
2.0 Public Disclosure 12 January, 2016
If you'd like more information on ISC Subscription Support and Advance
Security Notifications, please visit http://www.isc.org/support/.
Do you still have questions? Questions regarding this advisory should go to
firstname.lastname@example.org. To report a new issue, please encrypt your message
using email@example.com's PGP key which can be found here:
https://www.isc.org/downloads/software-support-policy/openpgp-key/. If you are
unable to use encrypted email, you may also report new issues at:
Note: ISC patches only currently supported versions. When possible we indicate
EOL versions affected. (For current information on which versions are actively
supported, please see http://www.isc.org/downloads/).
ISC Security Vulnerability Disclosure Policy: Details of our current security
advisory policy and practice can be found here:
This Knowledge Base article https://kb.isc.org/article/AA-01334 is the
complete and official security advisory document.
Internet Systems Consortium (ISC) is providing this notice on an "AS IS"
basis. No warranty or guarantee of any kind is expressed in this notice and
none should be implied. ISC expressly excludes and disclaims any warranties
regarding this notice or materials referred to in this notice, including,
without limitation, any implied warranty of merchantability, fitness for a
particular purpose, absence of hidden defects, or of non-infringement. Your
use or reliance on this notice or materials referred to in this notice is at
your own risk. ISC may change this notice at any time. A stand-alone copy or
paraphrase of the text of this document that omits the document URL is an
uncontrolled copy. Uncontrolled copies may lack important information, be out
of date, or contain factual errors.
Please help us to improve the content of our knowledge base by letting us know
below how we can improve this article.
Copyright 2001-2015 Internet Systems Consortium
If you have a technical question or problem on which you'd like help, please
don't submit it here as article feedback.
For assistance with problems and questions for which you have not been able to
find an answer in our Knowledge Base, we recommend searching our community
mailing list archives and/or posting your question there (you will need to
register there first for your posts to be accepted). The bind-users and the
dhcp-users lists particularly have a long-standing and active membership.
ISC relies on the financial support of the community to fund the development
of its open source software products. If you would like to support future
product evolution and maintenance as well having peace of mind knowing that
our team of experts are poised to provide you with individual technical
assistance whenever you call upon them, then please consider our Professional
Subscription Support services - details can be found on our main website.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to firstname.lastname@example.org
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
Australian Computer Emergency Response Team
The University of Queensland
Internet Email: email@example.com
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
-----BEGIN PGP SIGNATURE-----
-----END PGP SIGNATURE-----