Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2020.1874
USN-4374-1: Unbound vulnerabilities
28 May 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Unbound
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-12663 CVE-2020-12662
Reference: ESB-2020.1864
ESB-2020.1843
Original Bulletin:
https://usn.ubuntu.com/4374-1/
- --------------------------BEGIN INCLUDED TEXT--------------------
USN-4374-1: Unbound vulnerabilities
27 May 2020
unbound vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 20.04 LTS
o Ubuntu 19.10
o Ubuntu 18.04 LTS
Summary
Several security issues were fixed in Unbound.
Software Description
o unbound - validating, recursive, caching DNS resolver
Details
Lior Shafir, Yehuda Afek, and Anat Bremler-Barr discovered that Unbound
incorrectly handled certain queries. A remote attacker could use this issue to
perform an amplification attack directed at a target. (CVE-2020-12662)
It was discovered that Unbound incorrectly handled certain malformed answers. A
remote attacker could possibly use this issue to cause Unbound to crash,
resulting in a denial of service. (CVE-2020-12663)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04 LTS
libunbound8 - 1.9.4-2ubuntu1.1
unbound - 1.9.4-2ubuntu1.1
Ubuntu 19.10
libunbound8 - 1.9.0-2ubuntu1.1
unbound - 1.9.0-2ubuntu1.1
Ubuntu 18.04 LTS
libunbound2 - 1.6.7-1ubuntu2.3
unbound - 1.6.7-1ubuntu2.3
To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-12662
o CVE-2020-12663
- --------------------------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 auscert@auscert.org.au
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:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
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-----
Comment: http://www.auscert.org.au/render.html?it=1967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=3v/z
-----END PGP SIGNATURE-----