The transform_save function in transform.c in Augeas 1.0.0 through 1.1.0 does not properly calculate the permission values when the umask contains a "7," which causes world-writable permissions to be used for new files and allows local users to modify the files via unspecified vectors.
https://github.com/hercules-team/augeas/pull/58
https://github.com/hercules-team/augeas/commit/f5b4fc0c