ALAS-2013-252


Amazon Linux AMI Security Advisory: ALAS-2013-252
Advisory Release Date: 2014-09-16 22:04 Pacific
Severity: Medium

Issue Overview:

The 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.


Affected Packages:

kernel


Issue Correction:
Run yum update kernel to update your system. You will need to reboot your system in order for the new kernel to be running.

New Packages:
i686:
    kernel-debuginfo-3.4.71-63.98.amzn1.i686
    kernel-devel-3.4.71-63.98.amzn1.i686
    kernel-debuginfo-common-i686-3.4.71-63.98.amzn1.i686
    kernel-headers-3.4.71-63.98.amzn1.i686
    kernel-tools-debuginfo-3.4.71-63.98.amzn1.i686
    kernel-3.4.71-63.98.amzn1.i686
    kernel-tools-3.4.71-63.98.amzn1.i686

noarch:
    kernel-doc-3.4.71-63.98.amzn1.noarch

src:
    kernel-3.4.71-63.98.amzn1.src

x86_64:
    kernel-tools-3.4.71-63.98.amzn1.x86_64
    kernel-debuginfo-3.4.71-63.98.amzn1.x86_64
    kernel-headers-3.4.71-63.98.amzn1.x86_64
    kernel-devel-3.4.71-63.98.amzn1.x86_64
    kernel-debuginfo-common-x86_64-3.4.71-63.98.amzn1.x86_64
    kernel-3.4.71-63.98.amzn1.x86_64
    kernel-tools-debuginfo-3.4.71-63.98.amzn1.x86_64