The account lockout functionality in (1) Webmin 1.140 and (2) Usermin 1.070 does not parse certain character strings, which allows remote attackers to conduct a brute force attack to guess user IDs and passwords.
https://exchange.xforce.ibmcloud.com/vulnerabilities/16334
http://www.webmin.com/changes-1.150.html
http://www.securityfocus.com/bid/10523
http://www.securityfocus.com/bid/10474
http://www.mandrakesecure.net/en/advisories/advisory.php?name=MDKSA-2004:074
http://www.lac.co.jp/security/csl/intelligence/SNSadvisory_e/75_e.html
http://www.gentoo.org/security/en/glsa/glsa-200406-15.xml
http://www.gentoo.org/security/en/glsa/glsa-200406-12.xml