Amazon Linux AMI : kernel (ALAS-2013-252)
High Nessus Plugin ID 71269
SynopsisThe remote Amazon Linux AMI host is missing a security update.
DescriptionThe Linux kernel before 3.12, when UDP Fragmentation Offload (UFO) is enabled, does not properly initialize certain data structures, which allows local users to cause a denial of service (memory corruption and system crash) or possibly gain privileges via a crafted application that uses the UDP_CORK option in a setsockopt system call and sends both short and long packets, related to the ip_ufo_append_data function in net/ipv4/ip_output.c and the ip6_ufo_append_data function in net/ipv6/ip6_output.c.
The skb_flow_dissect function in net/core/flow_dissector.c in the Linux kernel through 3.12 allows remote attackers to cause a denial of service (infinite loop) via a small value in the IHL field of a packet with IPIP encapsulation.
SolutionRun 'yum update kernel' to update your system. You will need to reboot your system in order for the new kernel to be running.