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Ubuntu: New Python packages fix security vulnerabilities

Giampaolo Rodola discovered that the smtpd module in Python 3 did not properly handle certain error conditions. A remote attacker could exploit this to cause a denial of service via daemon outage. Niels Heinen discovered that the urllib module in Python 3 would process Location headers that specify a file:// URL. A remote attacker could use this to obtain sensitive information or cause a denial of service via resource consumption. Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1314-1
December 19, 2011

python3.1, python3.2 vulnerabilities
==========================================================================

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

- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS

Summary:

Applications using certain Python 3 modules could be made to crash or
expose sensitive information over the network.

Software Description:
- python3.1: An interactive high-level object-oriented language (version 3.1)
- python3.2: An interactive high-level object-oriented language (version 3.2)

Details:

Giampaolo Rodola discovered that the smtpd module in Python 3 did not
properly handle certain error conditions. A remote attacker could exploit
this to cause a denial of service via daemon outage. This issue only
affected Ubuntu 10.04 LTS. (CVE-2010-3493)

Niels Heinen discovered that the urllib module in Python 3 would process
Location headers that specify a file:// URL. A remote attacker could use
this to obtain sensitive information or cause a denial of service via
resource consumption. (CVE-2011-1521)

Update instructions:

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

Ubuntu 11.04:
 python3.1-minimal               3.1.3-1ubuntu1.1
 python3.2-minimal               3.2-1ubuntu1.1

Ubuntu 10.10:
 python3.1-minimal               3.1.2+20100915-0ubuntu4.1

Ubuntu 10.04 LTS:
 python3.1-minimal               3.1.2-0ubuntu3.1

In general, a standard system update will make all the necessary changes.
Daemons using the urllib or smtpd modules may also need to be restarted
after a pplying this update.

References:
 http://www.ubuntu.com/usn/usn-1314-1
 CVE-2010-3493, CVE-2011-1521

Package Information:
 https://launchpad.net/ubuntu/+source/python3.1/3.1.3-1ubuntu1.1
 https://launchpad.net/ubuntu/+source/python3.2/3.2-1ubuntu1.1
 https://launchpad.net/ubuntu/+source/python3.1/3.1.2+20100915-0ubuntu4.1
 https://launchpad.net/ubuntu/+source/python3.1/3.1.2-0ubuntu3.1
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