Amazon Linux AMI : kernel (ALAS-2011-22)

This script is Copyright (C) 2013-2014 Tenable Network Security, Inc.


Synopsis :

The remote Amazon Linux AMI host is missing a security update.

Description :

The epoll implementation in the Linux kernel 2.6.37.2 and earlier does
not properly traverse a tree of epoll file descriptors, which allows
local users to cause a denial of service (CPU consumption) via a
crafted application that makes epoll_create and epoll_ctl system
calls.

Buffer overflow in the xfs_readlink function in fs/xfs/xfs_vnodeops.c
in XFS in the Linux kernel 2.6, when CONFIG_XFS_DEBUG is disabled,
allows local users to cause a denial of service (memory corruption and
crash) and possibly execute arbitrary code via an XFS image containing
a symbolic link with a long pathname.

crypto/ghash-generic.c in the Linux kernel before 3.1 allows local
users to cause a denial of service (NULL pointer dereference and OOPS)
or possibly have unspecified other impact by triggering a failed or
missing ghash_setkey function call, followed by a (1) ghash_update
function call or (2) ghash_final function call, as demonstrated by a
write operation on an AF_ALG socket.

See also :

http://www.nessus.org/u?73edb97e

Solution :

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

Risk factor :

Medium / CVSS Base Score : 6.9
(CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C)

Family: Amazon Linux Local Security Checks

Nessus Plugin ID: 69581 ()

Bugtraq ID:

CVE ID: CVE-2011-1083
CVE-2011-4077
CVE-2011-4081