userpref.c in libimobiledevice 1.1.4, when $HOME and $XDG_CONFIG_HOME are not set, allows local users to overwrite arbitrary files via a symlink attack on (1) HostCertificate.pem, (2) HostPrivateKey.pem, (3) libimobiledevicerc, (4) RootCertificate.pem, or (5) RootPrivateKey.pem in /tmp/root/.config/libimobiledevice/.