The GridFTP in Globus Toolkit (GT) before 5.2.2, when certain autoconf macros are defined, does not properly check the return value from the getpwnam_r function, which might allow remote attackers to gain privileges by logging in with a user that does not exist, which causes GridFTP to run as the last user in the password file.
http://www.debian.org/security/2012/dsa-2523
http://lists.fedoraproject.org/pipermail/package-announce/2012-June/081797.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-June/081791.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-June/081787.html