The transform_save function in transform.c in Augeas before 1.0.0 allows local users to overwrite arbitrary files and obtain sensitive information via a symlink attack on a .augnew file.
https://github.com/hercules-team/augeas/commit/16387744
https://bugzilla.redhat.com/show_bug.cgi?id=772257
http://secunia.com/advisories/55811