-----BEGIN PGP SIGNED MESSAGE-----
AUSCERT External Security Bulletin Redistribution
Cisco Adaptive Security Appliance Username Enumeration Information
7 August 2017
AusCERT Security Bulletin Summary
Product: Cisco Adaptive Security Appliance
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Reduced Security -- Remote/Unauthenticated
CVE Names: CVE-2017-6752
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Adaptive Security Appliance Username Enumeration Information Disclosure Vulnerability
Advisory ID: cisco-sa-20170802-asa2
First Published: 2017 August 2 16:00 GMT
Version 1.0: Final
Cisco Bug IDs: CSCvd47888
CVSS Score: Base 5.3, Temporal 4.6
A vulnerability in the web interface of the Cisco Adaptive Security Appliance
(ASA) could allow an unauthenticated, remote attacker to determine valid
usernames. The attacker could use this information to conduct additional
The vulnerability is due to the interaction between Lightweight Directory
Access Protocol (LDAP) and SSL Connection Profile when they are configured
together. An attacker could exploit the vulnerability by performing a
username enumeration attack to the IP address of the device. An exploit
could allow the attacker to determine valid usernames.
There are workarounds that address this vulnerability.
This advisory is available at the following link:
This vulnerability affects Cisco ASA when the device is configured with both
LDAP and SSL Connection Profile and password management is enabled. For
information about affected software releases, consult the Cisco bug ID(s)
at the top of this advisory.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
The ASA administrator can use the following command to disable on-board
tunnel-group DefaultWEBVPNGroup general-attributes
For information about fixed software releases, consult the Cisco bug ID(s)
at the top of this advisory.
When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page, to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release. If
the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance providers.
Exploitation and Public Announcements
The Cisco Product Security Incident Response Team (PSIRT) is not aware
of any public announcements or malicious use of the vulnerability that is
described in this advisory.
This vulnerability was discovered by Kirk Hayes of Rapid7, Inc.
Version Description Section Status Date
1.0 Initial public release. -- Final 2017-August-02
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended
for end users of Cisco products.
- --------------------------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 email@example.com
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: firstname.lastname@example.org
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-----