Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2020.1557
Citrix Hypervisor Security Update
1 May 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Citrix Hypervisor
XenServer 7.1 LTSR Cumulative Update 2
XenServer
Publisher: Citrix
Operating System: Citrix XenServer
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-15473
Reference: ASB-2019.0060
ASB-2019.0059.2
ESB-2020.0342
ESB-2019.3015
Original Bulletin:
https://support.citrix.com/article/CTX272237
- --------------------------BEGIN INCLUDED TEXT--------------------
Citrix Hypervisor Security Update
Reference: CTX272237
Category : Low
Created : 30 Apr 2020
Modified : 30 Apr 2020
Applicable Products
o Citrix Hypervisor
o XenServer 7.1 LTSR Cumulative Update 2
o XenServer
Description of Problem
An issue has been discovered in Citrix Hypervisor that, if exploited, could
potentially allow an attacker on the management network to enumerate valid
administrative account usernames. Note that this attack does not disclose the
corresponding passwords and does grant not access to the attacked system.
This issue has the following identifier:
o CVE-2018-15473
This issue affects Citrix XenServer 7.1 LTSR CU2
Mitigating Factors
Customers who do not have ssh access enabled to the control domain are not
affected by this issue. Customers who have not enabled Active Directory
integration for administrative login will have minimal usernames exposed to
attacker enumeration.
What Customers Should Do
A hotfix has been released to address this issue. Citrix recommends that
customers running Citrix XenServer 7.1 LTSR CU2 install this hotfix as their
patching schedule allows.
The hotfix can be downloaded from the following location:
Citrix XenServer 7.1 LTSR CU2:CTX269660 - https://support.citrix.com/article/
CTX269660
Acknowledgements
Changelog
+--------------------------+--------------------------------------------------+
|Date |Change |
+--------------------------+--------------------------------------------------+
|2020-04-30 |Initial Publication |
+--------------------------+--------------------------------------------------+
- --------------------------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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=HxJK
-----END PGP SIGNATURE-----