Oracle Linux 5 / 6 : Unbreakable Enterprise kernel (ELSA-2011-2029)

This script is Copyright (C) 2013-2015 Tenable Network Security, Inc.


Synopsis :

The remote Oracle Linux host is missing one or more security updates.

Description :

Description of changes:


* CVE-2011-2898: Information leak in packet subsystem

Uninitialized struct padding in the packet subsystem led to an
information leak of two bytes of kernel memory to userspace.


* CVE-2011-2723: Remote denial of service vulnerability in gro.

The skb_gro_header_slow function in the Linux kernel had a bug which
allowed a remote attacker to put certain gro fields in an inconsistent
state, resulting in a denial of service.


* CVE-2011-2496: Local denial of service in mremap().

Robert Swiecki discovered that mremap() could be abused for local denial of
service by triggering a BUG_ON assert.


* CVE-2011-2484: Denial of service in taskstats subsystem.

The add_del_listener function in kernel/taskstats.c in the Linux kernel
did not prevent multiple registrations of exit handlers, which allowed
local users to cause a denial of service (memory and CPU consumption),
and bypass the OOM Killer, via a crafted application.


* CVE-2011-1833: Information disclosure in eCryptfs.

Vasiliy Kulikov of Openwall and Dan Rosenberg discovered that eCryptfs
incorrectly validated permissions on the requested source directory. A
local attacker could use this flaw to mount an arbitrary directory,
possibly leading to information disclosure.


[2.6.32-200.20.1.el6uek]
- af_packet: prevent information leak {CVE-2011-2898}
- gro: Only reset frag0 when skb can be pulled {CVE-2011-2723}
- vm: fix vm_pgoff wrap in upward expansion {CVE-2011-2496}
- taskstats: don't allow duplicate entries in listener mode {CVE-2011-2484}
- Ecryptfs: Add mount option to check uid of device being mounted
{CVE-2011-1833}

See also :

https://oss.oracle.com/pipermail/el-errata/2011-October/002394.html
https://oss.oracle.com/pipermail/el-errata/2011-October/002395.html

Solution :

Update the affected unbreakable enterprise kernel packages.

Risk factor :

Medium / CVSS Base Score : 5.7
(CVSS2#AV:A/AC:M/Au:N/C:N/I:N/A:C)

Family: Oracle Linux Local Security Checks

Nessus Plugin ID: 68422 ()

Bugtraq ID:

CVE ID: CVE-2011-1833
CVE-2011-2484
CVE-2011-2496
CVE-2011-2723
CVE-2011-2898