ubuntu-security-announce Digest, Vol 96, Issue 11

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Today's Topics:

1. [USN-1571-1] DHCP vulnerability (Marc Deslauriers)
2. [USN-1572-1] Linux kernel vulnerabilities (John Johansen)
3. [USN-1573-1] Linux kernel (EC2) vulnerabilities (John Johansen)


----------------------------------------------------------------------

Message: 1
Date: Tue, 18 Sep 2012 08:21:23 -0400
From: Marc Deslauriers <marc.deslauriers@canonical.com>
To: ubuntu-security-announce@lists.ubuntu.com
Subject: [USN-1571-1] DHCP vulnerability
Message-ID: <1347970883.3307.37.camel@mdlinux>
Content-Type: text/plain; charset="utf-8"

==========================================================================
Ubuntu Security Notice USN-1571-1
September 18, 2012

dhcp3, isc-dhcp vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.04 LTS

Summary:

DHCP could be made to crash if it received specially crafted network
traffic.

Software Description:
- isc-dhcp: DHCP server and client
- dhcp3: DHCP server and client

Details:

Glen Eustace discovered that the DHCP server incorrectly handled IPv6
expiration times. A remote attacker could use this issue to cause DHCP to
crash, resulting in a denial of service. This issue only affected Ubuntu
11.04, Ubuntu 11.10 and Ubuntu 12.04 LTS. (CVE-2012-3955)

Dan Rosenberg discovered that the DHCP AppArmor profile could be escaped by
using environment variables. This update mitigates the issue by sanitizing
certain variables in the DHCP shell scripts.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 12.04 LTS:
isc-dhcp-client 4.1.ESV-R4-0ubuntu5.5
isc-dhcp-server 4.1.ESV-R4-0ubuntu5.5

Ubuntu 11.10:
isc-dhcp-client 4.1.1-P1-17ubuntu10.5
isc-dhcp-server 4.1.1-P1-17ubuntu10.5

Ubuntu 11.04:
isc-dhcp-client 4.1.1-P1-15ubuntu9.6
isc-dhcp-server 4.1.1-P1-15ubuntu9.6

Ubuntu 10.04 LTS:
dhcp3-client 3.1.3-2ubuntu3.4
dhcp3-server 3.1.3-2ubuntu3.4

In general, a standard system update will make all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-1571-1
CVE-2012-3955, https://launchpad.net/bugs/1016643

Package Information:
https://launchpad.net/ubuntu/+source/isc-dhcp/4.1.ESV-R4-0ubuntu5.5
https://launchpad.net/ubuntu/+source/isc-dhcp/4.1.1-P1-17ubuntu10.5
https://launchpad.net/ubuntu/+source/isc-dhcp/4.1.1-P1-15ubuntu9.6
https://launchpad.net/ubuntu/+source/dhcp3/3.1.3-2ubuntu3.4


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Message: 2
Date: Tue, 18 Sep 2012 18:14:46 -0700
From: John Johansen <john.johansen@canonical.com>
To: ubuntu-security-announce@lists.ubuntu.com
Subject: [USN-1572-1] Linux kernel vulnerabilities
Message-ID: <50591C86.7090907@canonical.com>
Content-Type: text/plain; charset="iso-8859-1"

==========================================================================
Ubuntu Security Notice USN-1572-1
September 19, 2012

linux vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Ben Hutchings reported a flaw in the Linux kernel with some network drivers
that support TSO (TCP segment offload). A local or peer user could exploit
this flaw to to cause a denial of service. (CVE-2012-3412)

Jay Fenlason and Doug Ledford discovered a bug in the Linux kernel
implementation of RDS sockets. A local unprivileged user could potentially
use this flaw to read privileged information from the kernel.
(CVE-2012-3430)

A flaw was discovered in the madvise feature of the Linux kernel's memory
subsystem. An unprivileged local use could exploit the flaw to cause a
denial of service (crash the system). (CVE-2012-3511)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 10.04 LTS:
linux-image-2.6.32-43-386 2.6.32-43.97
linux-image-2.6.32-43-generic 2.6.32-43.97
linux-image-2.6.32-43-generic-pae 2.6.32-43.97
linux-image-2.6.32-43-ia64 2.6.32-43.97
linux-image-2.6.32-43-lpia 2.6.32-43.97
linux-image-2.6.32-43-powerpc 2.6.32-43.97
linux-image-2.6.32-43-powerpc-smp 2.6.32-43.97
linux-image-2.6.32-43-powerpc64-smp 2.6.32-43.97
linux-image-2.6.32-43-preempt 2.6.32-43.97
linux-image-2.6.32-43-server 2.6.32-43.97
linux-image-2.6.32-43-sparc64 2.6.32-43.97
linux-image-2.6.32-43-sparc64-smp 2.6.32-43.97
linux-image-2.6.32-43-versatile 2.6.32-43.97
linux-image-2.6.32-43-virtual 2.6.32-43.97

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References:
http://www.ubuntu.com/usn/usn-1572-1
CVE-2012-3412, CVE-2012-3430, CVE-2012-3511

Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.32-43.97

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Message: 3
Date: Tue, 18 Sep 2012 18:21:34 -0700
From: John Johansen <john.johansen@canonical.com>
To: ubuntu-security-announce@lists.ubuntu.com
Subject: [USN-1573-1] Linux kernel (EC2) vulnerabilities
Message-ID: <50591E1E.3030205@canonical.com>
Content-Type: text/plain; charset="iso-8859-1"

==========================================================================
Ubuntu Security Notice USN-1573-1
September 19, 2012

linux-ec2 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux-ec2: Linux kernel for EC2

Details:

Ben Hutchings reported a flaw in the Linux kernel with some network drivers
that support TSO (TCP segment offload). A local or peer user could exploit
this flaw to to cause a denial of service. (CVE-2012-3412)

Jay Fenlason and Doug Ledford discovered a bug in the Linux kernel
implementation of RDS sockets. A local unprivileged user could potentially
use this flaw to read privileged information from the kernel.
(CVE-2012-3430)

A flaw was discovered in the madvise feature of the Linux kernel's memory
subsystem. An unprivileged local use could exploit the flaw to cause a
denial of service (crash the system). (CVE-2012-3511)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 10.04 LTS:
linux-image-2.6.32-348-ec2 2.6.32-348.54

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References:
http://www.ubuntu.com/usn/usn-1573-1
CVE-2012-3412, CVE-2012-3430, CVE-2012-3511

Package Information:
https://launchpad.net/ubuntu/+source/linux-ec2/2.6.32-348.54

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