wu-ftpd 2.6.2 and earlier, with the restricted-gid option enabled, allows local users to bypass access restrictions by changing the permissions to prevent access to their home directory, which causes wu-ftpd to use the root directory instead.
marc.info/?l=bugtraq&m=108999466902690&w=2
secunia.com/advisories/11055
secunia.com/advisories/20168
sunsolve.sun.com/search/document.do?assetkey=1-26-102356-1
www.debian.org/security/2004/dsa-457
www.frsirt.com/english/advisories/2006/1867
www.redhat.com/support/errata/RHSA-2004-096.html
www.securityfocus.com/bid/9832
exchange.xforce.ibmcloud.com/vulnerabilities/15423
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1147
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1636
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1637
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A648