Wget 1.9 and 1.9.1 allows local users to overwrite arbitrary files via a symlink attack on the name of the file being downloaded.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9830
https://exchange.xforce.ibmcloud.com/vulnerabilities/16167
http://www.redhat.com/support/errata/RHSA-2005-771.html
http://www.mandriva.com/security/advisories?name=MDKSA-2005:204
http://secunia.com/advisories/17399
http://marc.info/?l=wget&m=108483270227139&w=2