Amazon Linux AMI : kernel Multiple Vulnerabilities (ALAS-2011-26)

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


Synopsis :

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

Description :

Package updates are available for Amazon Linux AMI that fix the
following vulnerabilities :

IPv6 fragment identification value generation could allow a remote
attacker to disrupt a target system's networking, preventing
legitimate users from accessing its services. (CVE-2011-2699)

A signedness issue was found in the Linux kernel's CIFS (Common
Internet File System) implementation. A malicious CIFS server could
send a specially-crafted response to a directory read request that
would result in a denial of service or privilege escalation on a
system that has a CIFS share mounted. (CVE-2011-3191)

A flaw was found in the way the Linux kernel handled fragmented IPv6
UDP datagrams over the bridge with UDP Fragmentation Offload (UFO)
functionality on. A remote attacker could use this flaw to cause a
denial of service. (CVE-2011-4326)

The way IPv4 and IPv6 protocol sequence numbers and fragment IDs were
generated could allow a man-in-the-middle attacker to inject packets
and possibly hijack connections. Protocol sequence numbers and
fragment IDs are now more random. (CVE-2011-3188)

A buffer overflow flaw was found in the Linux kernel's FUSE
(Filesystem in Userspace) implementation. A local user in the fuse
group who has access to mount a FUSE file system could use this flaw
to cause a denial of service. (CVE-2011-3353)

A flaw was found in the b43 driver in the Linux kernel. If a system
had an active wireless interface that uses the b43 driver, an attacker
able to send a specially-crafted frame to that interface could cause a
denial of service. (CVE-2011-3359)

A flaw was found in the way CIFS shares with DFS referrals at their
root were handled. An attacker on the local network who is able to
deploy a malicious CIFS server could create a CIFS network share that,
when mounted, would cause the client system to crash. (CVE-2011-3363)

A flaw was found in the way the Linux kernel handled VLAN 0 frames
with the priority tag set. When using certain network drivers, an
attacker on the local network could use this flaw to cause a denial of
service. (CVE-2011-3593)

A flaw in the way memory containing security-related data was handled
in tpm_read() could allow a local, unprivileged user to read the
results of a previously run TPM command. (CVE-2011-1162)

A heap overflow flaw was found in the Linux kernel's EFI GUID
Partition Table (GPT) implementation. A local attacker could use this
flaw to cause a denial of service by mounting a disk that contains
specially-crafted partition tables. (CVE-2011-1577)

The I/O statistics from the taskstats subsystem could be read without
any restrictions. A local, unprivileged user could use this flaw to
gather confidential information, such as the length of a password used
in a process. (CVE-2011-2494)

It was found that the perf tool, a part of the Linux kernel's
Performance Events implementation, could load its configuration file
from the current working directory. If a local user with access to the
perf tool were tricked into running perf in a directory that contains
a specially-crafted configuration file, it could cause perf to
overwrite arbitrary files and directories accessible to that user.
(CVE-2011-2905)

See also :

http://www.nessus.org/u?b4eadb5b

Solution :

Run 'yum upgrade kernel' to upgrade your system. You will need to
reboot your system for the new kernel to be loaded.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)