ltdl.c in libltdl in GNU Libtool 1.5.x, and 2.2.6 before 2.2.6b, as used in Ham Radio Control Libraries, Q, and possibly other products, attempts to open a .la file in the current working directory, which allows local users to gain privileges via a Trojan horse file.

GNU libtool before 1.5.2, during compile time, allows local users to overwrite arbitrary files via a symlink attack on libtool directories in /tmp.