bash-doc 3.2 allows local users to overwrite arbitrary files via a symlink attack on a /tmp/cb#####.? temporary file, related to the (1) aliasconv.sh, (2) aliasconv.bash, and (3) cshtobash scripts.
http://www.vupen.com/english/advisories/2011/0414
http://www.securityfocus.com/bid/32733
http://www.redhat.com/support/errata/RHSA-2011-1073.html
http://www.redhat.com/support/errata/RHSA-2011-0261.html
http://www.mandriva.com/security/advisories?name=MDVSA-2010:004
http://security.gentoo.org/glsa/glsa-201210-05.xml
http://secunia.com/advisories/51086