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Ubuntu: Security update for Python

It was discovered that Python would prepend an empty string to sys.path under certain circumstances. A local attacker with write access to the current working directory could exploit this to execute arbitrary code. It was discovered that the audioop module did not correctly perform input validation. If a user or automatated system were tricked into opening a crafted audio file, an attacker could cause a denial of service via application crash. Giampaolo Rodola discovered several race conditions in the smtpd module. A remote attacker could exploit this to cause a denial of service via daemon outage.

It was discovered that the CGIHTTPServer module did properly perform input validation on certain HTTP GET requests. A remote attacker could potentially obtain access to CGI script source files. Niels Heinen discovered that the urllib and urllib2 modules would process Location headers that specify a redirection to file: URLs. A remote attacker could exploit this to obtain sensitive information or cause a denial of service. It was discovered that SimpleHTTPServer did not use a charset parameter in the Content-Type HTTP header. An attacker could potentially exploit this to conduct cross-site scripting (XSS) attacks against Internet Explorer 7 users.

It was discovered that Python distutils contained a race condition when creating the ~/.pypirc file. A local attacker could exploit this to obtain sensitive information. It was discovered that SimpleXMLRPCServer did not properly validate its input when handling HTTP POST requests. A remote attacker could exploit this to cause a denial of service via excessive CPU utilization. It was discovered that Python was susceptible to hash algorithm attacks. An attacker could cause a denial of service under certian circumstances. This updates adds the ‘-R’ command line option and honors setting the PYTHONHASHSEED environment variable to ‘random’ to salt str and datetime objects with an unpredictable value.

Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1596-1
October 04, 2012

python2.6 vulnerabilities
==========================================================================

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

- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in Python 2.6.

Software Description:
- python2.6: An interactive high-level object-oriented language

Details:

It was discovered that Python would prepend an empty string to sys.path
under certain circumstances. A local attacker with write access to the
current working directory could exploit this to execute arbitrary code.
(CVE-2008-5983)

It was discovered that the audioop module did not correctly perform input
validation. If a user or automatated system were tricked into opening a
crafted audio file, an attacker could cause a denial of service via
application crash. (CVE-2010-1634, CVE-2010-2089)

Giampaolo Rodola discovered several race conditions in the smtpd module.
A remote attacker could exploit this to cause a denial of service via
daemon outage. (CVE-2010-3493)

It was discovered that the CGIHTTPServer module did properly perform
input validation on certain HTTP GET requests. A remote attacker could
potentially obtain access to CGI script source files. (CVE-2011-1015)

Niels Heinen discovered that the urllib and urllib2 modules would process
Location headers that specify a redirection to file: URLs. A remote
attacker could exploit this to obtain sensitive information or cause a
denial of service. This issue only affected Ubuntu 11.04. (CVE-2011-1521)

It was discovered that SimpleHTTPServer did not use a charset parameter in
the Content-Type HTTP header. An attacker could potentially exploit this
to conduct cross-site scripting (XSS) attacks against Internet Explorer 7
users. This issue only affected Ubuntu 11.04. (CVE-2011-4940)

It was discovered that Python distutils contained a race condition when
creating the ~/.pypirc file. A local attacker could exploit this to obtain
sensitive information. (CVE-2011-4944)

It was discovered that SimpleXMLRPCServer did not properly validate its
input when handling HTTP POST requests. A remote attacker could exploit
this to cause a denial of service via excessive CPU utilization.
(CVE-2012-0845)

It was discovered that Python was susceptible to hash algorithm attacks.
An attacker could cause a denial of service under certian circumstances.
This updates adds the '-R' command line option and honors setting the
PYTHONHASHSEED environment variable to 'random' to salt str and datetime
objects with an unpredictable value. (CVE-2012-1150)

Update instructions:

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

Ubuntu 11.10:
 python2.6                       2.6.7-4ubuntu1.1
 python2.6-minimal               2.6.7-4ubuntu1.1

Ubuntu 11.04:
 python2.6                       2.6.6-6ubuntu7.1
 python2.6-minimal               2.6.6-6ubuntu7.1

Ubuntu 10.04 LTS:
 python2.6                       2.6.5-1ubuntu6.1
 python2.6-minimal               2.6.5-1ubuntu6.1

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

References:
 http://www.ubuntu.com/usn/usn-1596-1
 CVE-2008-5983, CVE-2010-1634, CVE-2010-2089, CVE-2010-3493,
 CVE-2011-1015, CVE-2011-1521, CVE-2011-4940, CVE-2011-4944,
 CVE-2012-0845, CVE-2012-1150

Package Information:
 https://launchpad.net/ubuntu/+source/python2.6/2.6.7-4ubuntu1.1
 https://launchpad.net/ubuntu/+source/python2.6/2.6.6-6ubuntu7.1
 https://launchpad.net/ubuntu/+source/python2.6/2.6.5-1ubuntu6.1
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