unshar (unshar.c) in sharutils 4.2.1 allows local users to overwrite arbitrary files via a symlink attack on the unsh.X temporary file.
bugs.debian.org/cgi-bin/bugreport.cgi?bug=302412
www.redhat.com/support/errata/RHSA-2005-377.html
www.securityfocus.com/bid/12981
bugzilla.ubuntu.com/show_bug.cgi?id=8459
exchange.xforce.ibmcloud.com/vulnerabilities/19957
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9613
usn.ubuntu.com/104-1/