Ubuntu Security Notice USN-732-1 – Wolfgang M. Reimer discovered that dash, when invoked as a login shell, would source .profile files from the current directory. Local users may be able to bypass security restrictions and gain root privileges by placing specially crafted .profile files where they might get sourced by other dash users.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/75605/USN-732-1.txt
Source: https://packetstormsecurity.com/files/75605/Ubuntu-Security-Notice-732-1.html