FreeBSD -- Memory disclosure vulnerability in libalias

Problem Description:
The FTP packet handler in libalias incorrectly calculates some packet
lengths. This may result in disclosing small amounts of memory from the
kernel (for the in-kernel NAT implementation) or from the process space for
natd (for the userspace implementation).
Impact:
A malicious attacker could send specially constructed packets that exploit the
erroneous calculation allowing the attacker to disclose small amount of memory
either from the kernel (for the in-kernel NAT implementation) or from the
process space for natd (for the userspace implementation).