webmin 0.84 and earlier allows local users to overwrite and create arbitrary files via a symlink attack.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6011
http://www.linux-mandrake.com/en/security/2001/MDKSA-2001-016.php3
http://www.calderasystems.com/support/security/advisories/CSSA-2001-004.0.txt