From snsadv@lac.co.jp Wed Jun 16 08:19:31 2004 From: snsadv To: bugtraq@securityfocus.com Date: Fri, 11 Jun 2004 17:25:13 +0900 Subject: [SNS Advisory No.75] Webmin/Usermin Account Lockout Bypass Vulnerability ---------------------------------------------------------------------- SNS Advisory No.75 Webmin/Usermin Account Lockout Bypass Vulnerability Problem first discovered on: Sun, 11 Apr 2004 Published on: Fri, 11 Jun 2004 ---------------------------------------------------------------------- Overview: --------- A vulnerability that could result in account lockout bypassing exists in both Webmin and Usermin. Problem Description: -------------------- Webmin is a web-based system administration tool for Unix. Usermin is a web interface that allows all users on a Unix system to easily receive mails and to perform SSH and mail forwarding configuration. Both Webmin and Usermin ship with an account lockout functionality, which fails to parse certain character strings. By bypassing this functionality, attackers can attempt to guess IDs and passwords continuously, prevent legitimate users from logging on, etc. Tested Versions: ---------------- Webmin Version 1.140 Usermin Version 1.070 Solution: --------- This problem can be eliminated by upgrading to Webmin version 1.150 and to Usermin version 1.080, which are available at: http://www.webmin.com/ Discovered by: -------------- Keigo Yamazaki Acknowledgements: ----------------- Mr. Jamie Cameron Disclaimer: ----------- The information contained in this advisory may be revised without prior notice and is provided as it is. Users shall take their own risk when taking any actions following reading this advisory. LAC Co., Ltd. shall take no responsibility for any problems, loss or damage caused by, or by the use of information provided here. This advisory can be found at the following URL: http://www.lac.co.jp/security/csl/intelligence/SNSadvisory_e/75_e.html ------------------------------------------------------------------ Secure Net Service(SNS) Security Advisory Computer Security Laboratory, LAC http://www.lac.co.jp/security/