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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2012.1066 Cisco Secure Access Control System TACACS+ Authentication Bypass Vulnerability 8 November 2012 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Secure Access Control System Publisher: Cisco Systems Operating System: Cisco Impact/Access: Unauthorised Access -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2012-5424 Original Bulletin: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20121107-acs - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Cisco Secure Access Control System TACACS+ Authentication Bypass Vulnerability Advisory ID: cisco-sa-20121107-acs Revision 1.0 For Public Release 2012 November 7 16:00 UTC (GMT) - - ---------------------------------------------------------------------- Summary ======= Cisco Secure Access Control System (ACS) contains a vulnerability that could allow an unauthenticated, remote attacker to bypass TACACS+ based authentication service offered by the affected product. The vulnerability is due to improper validation of the user-supplied password when TACACS+ is the authentication protocol and Cisco Secure ACS is configured with a Lightweight Directory Access Protocol (LDAP) external identity store. An attacker may exploit this vulnerability by sending a special sequence of characters when prompted for the user password. The attacker would need to know a valid username stored in the LDAP external identity store to exploit this vulnerability, and the exploitation is limited to impersonate only that user. An exploit could allow the attacker to successfully authenticate to any system using TACACS+ in combination with an affected Cisco Secure ACS. Cisco has released free software updates that address this vulnerability. There are no workarounds for this vulnerability. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20121107-acs - -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.18 (Darwin) Comment: GPGTools - http://gpgtools.org iF4EAREIAAYFAlCahBgACgkQUddfH3/BbTry0gD+ODX/mW0lFysJb+ga9d8hSJib y3Nt7PWArjcjgBBfV6cA/3xq5kIJ57XxuNw63zIaTpay5N+sUNLDJ37bdjxu+hTf =GL1C - -----END PGP SIGNATURE----- - --------------------------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. 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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 iQIVAwUBUJsX8u4yVqjM2NGpAQK+Pg//d+5SGfrjqZpXK3MpZUrm+kzJMQkBFSIE UmGNcJS9YV6rh9FwbqTBIoQkHZgul+xeSP5fiyl+x9HDiHWDGWsb8043Xzeb+0N+ yphdIc9IYT/PH/CO0/bQGyPJwieLOVBKO+QN6aDMvADPJ8eTlw+lBEH+yV20IAOv Ee6NsV7BclGnE6P8mRYSmSJehlsucfwHVfQyiTe+H3sCg6G/qQ0E7rvpT7j0LwKG rPhcVba8TOB4y7rEsIgWwg+OGzLYo1+2rSZW7AjKjH+O3pUQg6ubpoL5sQzkL3an AplxHolgjYhzfhr5USvHVyEXv9/2oVpwRMjaKkk7jWtQ0J1IKrf/boutAWpc9Uyh xVncoOc1EO6IOx6opYvqyizZqczyN9sBM6RCXCTP1DNubztD0zVhJKIw33JweiQ4 NH/Ks2NfRCqABDVhqmI7D61JEGdHTyR5keja6GbOBI6M/y+fD6hARM7/SbQzm5A3 FhOQIZ21iBiQLR0I5N+G8UuvetiWUE7Xk20gDLNhDQXePJdQZ7cfDhjmFVbEMiqO KwiIsf/073AkjxUoT98cnxz/bEvYijMYvAYsXH0UAT4ezWo+h/dbyh0ysVUzuV03 JgLzoYFAL9W/ogeG3527sZqV9UZ13SI6oCJkpRzmASBL5idVQ8XcBTuTJf559yLV B2er6N6taVQ= =gnLa -----END PGP SIGNATURE-----