The mksmbpasswd shell script (mksmbpasswd.sh) in Samba 3.0.0 and 3.0.1, when creating an account but marking it as disabled, may overwrite the user password with an uninitialized buffer, which could enable the account with a more easily guessable password.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A827
https://exchange.xforce.ibmcloud.com/vulnerabilities/15132
http://www.vuxml.org/freebsd/3388eff9-5d6e-11d8-80e3-0020ed76ef5a.html
http://www.securityfocus.com/bid/9637
http://www.redhat.com/support/errata/RHSA-2004-064.html