Ubuntu Security Notice 841-1 – Arand Nash discovered that applications linked to GLib (e.g. Nautilus) did not correctly copy symlinks. If a user copied symlinks with GLib, the symlink target files would become world-writable, allowing local attackers to gain access to potentially sensitive information.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/81819/USN-841-1.txt
Source: https://packetstormsecurity.com/files/81819/Ubuntu-Security-Notice-841-1.html