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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.1942 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 Resolution: Patch/Upgrade CVE Names: CVE-2017-6752 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170802-asa2 - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Adaptive Security Appliance Username Enumeration Information Disclosure Vulnerability Medium Advisory ID: cisco-sa-20170802-asa2 First Published: 2017 August 2 16:00 GMT Version 1.0: Final Workarounds: Yes Cisco Bug IDs: CSCvd47888 CVSS Score: Base 5.3, Temporal 4.6 CVE-2017-6752 CWE-200 Summary 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 reconnaissance attacks. 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: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170802-asa2 Affected Products Vulnerable Products 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 vulnerability. Workarounds The ASA administrator can use the following command to disable on-board password management: tunnel-group DefaultWEBVPNGroup general-attributes no password-management Fixed Software 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. Source This vulnerability was discovered by Kirk Hayes of Rapid7, Inc. URL https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170802-asa2 Revision History Version Description Section Status Date 1.0 Initial public release. -- Final 2017-August-02 Legal Disclaimer 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 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: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== 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 iQIVAwUBWYfqOox+lLeg9Ub1AQj6Uw//ewhr0q9w4oHu956B4glP19X0u6SnU7o8 nmY5ssZT4DEvkHz09zI0e+vcLutgX3BLT3KSSNBSJH1lFx6QNk2kXYtQuDU4d/9Y 7Dao+HPiRIyJPlyTLy9WSZteyyphDJNcHm9DcyxppagxvYwkNM5Ube60Jzg3v+G2 wqK8TVz7U83GA3W+7aQkXTkSESRc0hZVtJL/25N+kMqzFicWD3SjvaroV5iGrWeR 46FSqdn2HKId1qSgXXvofjGa/KH0m/XQZV/pG2dw4qotv3iHr8F/EuU6n0VvFmTE YhEUbrF8S25lOL7myb34XOrtlm5SDkU3eBWCz8YGqtLChsmZT+j0bXqs+nZ80VdZ C+kXMpHgtuJ/x4RR35A17ZrW+OKRM9Nu6QEZ4A6nNfb4c8XWOchkiFvdt8r/eJy7 SlkcE4HSPxW1y1wJkxLvxVqla/ffAPqOh1TLr+bz/lsg/FqHkjsY49MnRGPvNYTD 9Y3sV20ZRuOHZ9D8fEH+wi8tfycS5BdCImn2r9OpC2oFmZ1eubmy0Y9oMQgQS7n+ BUKm7WTOMCDtQF1eAmoc9vw/b9qUMVT7K2HOrdrr8sfs0O4N1EC+NrOIGEmQwhDx wb3e0i21yVTSf1HGoxovWJ5g87hUC8BFiiMc8l7tHmZqkA6U/kVK2me4aUBwLNW1 8F07qceMyH4= =HKm8 -----END PGP SIGNATURE-----