rrdedit in netmrg 0.20 allows local users to overwrite arbitrary files via a symlink attack on (1) /tmp/*.xml and (2) /tmp/*.backup temporary files.
https://exchange.xforce.ibmcloud.com/vulnerabilities/44834
https://bugs.gentoo.org/show_bug.cgi?id=235770
http://www.securityfocus.com/bid/30930
http://www.openwall.com/lists/oss-security/2008/10/30/2
http://uvw.ru/report.lenny.txt