Atstake Security Advisory A010603-1 - Multiple platform ethernet Network Interface Card (NIC) device drivers incorrectly handle frame padding, allowing an attacker to view slices of previously transmitted packets or portions of kernel memory. This vulnerability is the result of incorrect implementations of RFC requirements and poor programming practices, the combination of which results in several variations of this information leakage vulnerability. The simplest method to implement this attack is to send ICMP packets and watch for kernel memory in the replies. PDF report on this issue available here.
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