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Red Hat Security Advisory 2012-0745-01

Red Hat Security Advisory 2012-0745-01
Posted Jun 18, 2012
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2012-0745-01 - Python is an interpreted, interactive, object-oriented programming language. A denial of service flaw was found in the implementation of associative arrays in Python. An attacker able to supply a large number of inputs to a Python application that are used as keys when inserting data into an array could trigger multiple hash function collisions, making array operations take an excessive amount of CPU time. To mitigate this issue, randomization has been added to the hash function to reduce the chance of an attacker successfully causing intentional collisions.

tags | advisory, denial of service, python
systems | linux, redhat
advisories | CVE-2011-4940, CVE-2011-4944, CVE-2012-1150
MD5 | 71ab9ac648077b734a35a8a9ede7ed0e

Red Hat Security Advisory 2012-0745-01

Change Mirror Download
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=====================================================================
Red Hat Security Advisory

Synopsis: Moderate: python security update
Advisory ID: RHSA-2012:0745-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-0745.html
Issue date: 2012-06-18
CVE Names: CVE-2011-4940 CVE-2011-4944 CVE-2012-1150
=====================================================================

1. Summary:

Updated python packages that fix multiple security issues are now available
for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

2. Relevant releases/architectures:

RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

3. Description:

Python is an interpreted, interactive, object-oriented programming
language.

A denial of service flaw was found in the implementation of associative
arrays (dictionaries) in Python. An attacker able to supply a large number
of inputs to a Python application (such as HTTP POST request parameters
sent to a web application) that are used as keys when inserting data into
an array could trigger multiple hash function collisions, making array
operations take an excessive amount of CPU time. To mitigate this issue,
randomization has been added to the hash function to reduce the chance of
an attacker successfully causing intentional collisions. (CVE-2012-1150)

Note: The hash randomization is not enabled by default as it may break
applications that incorrectly depend on dictionary ordering. To enable the
protection, the new "PYTHONHASHSEED" environment variable or the Python
interpreter's "-R" command line option can be used. Refer to the python(1)
manual page for details.

The RHSA-2012:0731 expat erratum must be installed with this update, which
adds hash randomization to the Expat library used by the Python pyexpat
module.

A flaw was found in the way the Python SimpleHTTPServer module generated
directory listings. An attacker able to upload a file with a
specially-crafted name to a server could possibly perform a cross-site
scripting (XSS) attack against victims visiting a listing page generated by
SimpleHTTPServer, for a directory containing the crafted file (if the
victims were using certain web browsers). (CVE-2011-4940)

A race condition was found in the way the Python distutils module set file
permissions during the creation of the .pypirc file. If a local user had
access to the home directory of another user who is running distutils, they
could use this flaw to gain access to that user's .pypirc file, which can
contain usernames and passwords for code repositories. (CVE-2011-4944)

Red Hat would like to thank oCERT for reporting CVE-2012-1150. oCERT
acknowledges Julian Wälde and Alexander Klink as the original reporters of
CVE-2012-1150.

All Python users should upgrade to these updated packages, which contain
backported patches to correct these issues.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

5. Bugs fixed (http://bugzilla.redhat.com/):

750555 - CVE-2012-1150 python: hash table collisions CPU usage DoS (oCERT-2011-003)
758905 - CVE-2011-4944 python: distutils creates ~/.pypirc insecurely
803500 - CVE-2011-4940 python: potential XSS in SimpleHTTPServer's list_directory()

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/python-2.4.3-46.el5_8.2.src.rpm

i386:
python-2.4.3-46.el5_8.2.i386.rpm
python-debuginfo-2.4.3-46.el5_8.2.i386.rpm
python-libs-2.4.3-46.el5_8.2.i386.rpm
python-tools-2.4.3-46.el5_8.2.i386.rpm
tkinter-2.4.3-46.el5_8.2.i386.rpm

x86_64:
python-2.4.3-46.el5_8.2.x86_64.rpm
python-debuginfo-2.4.3-46.el5_8.2.x86_64.rpm
python-libs-2.4.3-46.el5_8.2.x86_64.rpm
python-tools-2.4.3-46.el5_8.2.x86_64.rpm
tkinter-2.4.3-46.el5_8.2.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/python-2.4.3-46.el5_8.2.src.rpm

i386:
python-debuginfo-2.4.3-46.el5_8.2.i386.rpm
python-devel-2.4.3-46.el5_8.2.i386.rpm

x86_64:
python-debuginfo-2.4.3-46.el5_8.2.i386.rpm
python-debuginfo-2.4.3-46.el5_8.2.x86_64.rpm
python-devel-2.4.3-46.el5_8.2.i386.rpm
python-devel-2.4.3-46.el5_8.2.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/python-2.4.3-46.el5_8.2.src.rpm

i386:
python-2.4.3-46.el5_8.2.i386.rpm
python-debuginfo-2.4.3-46.el5_8.2.i386.rpm
python-devel-2.4.3-46.el5_8.2.i386.rpm
python-libs-2.4.3-46.el5_8.2.i386.rpm
python-tools-2.4.3-46.el5_8.2.i386.rpm
tkinter-2.4.3-46.el5_8.2.i386.rpm

ia64:
python-2.4.3-46.el5_8.2.ia64.rpm
python-debuginfo-2.4.3-46.el5_8.2.i386.rpm
python-debuginfo-2.4.3-46.el5_8.2.ia64.rpm
python-devel-2.4.3-46.el5_8.2.ia64.rpm
python-libs-2.4.3-46.el5_8.2.i386.rpm
python-libs-2.4.3-46.el5_8.2.ia64.rpm
python-tools-2.4.3-46.el5_8.2.ia64.rpm
tkinter-2.4.3-46.el5_8.2.ia64.rpm

ppc:
python-2.4.3-46.el5_8.2.ppc.rpm
python-debuginfo-2.4.3-46.el5_8.2.ppc.rpm
python-debuginfo-2.4.3-46.el5_8.2.ppc64.rpm
python-devel-2.4.3-46.el5_8.2.ppc.rpm
python-devel-2.4.3-46.el5_8.2.ppc64.rpm
python-libs-2.4.3-46.el5_8.2.ppc.rpm
python-libs-2.4.3-46.el5_8.2.ppc64.rpm
python-tools-2.4.3-46.el5_8.2.ppc.rpm
tkinter-2.4.3-46.el5_8.2.ppc.rpm

s390x:
python-2.4.3-46.el5_8.2.s390x.rpm
python-debuginfo-2.4.3-46.el5_8.2.s390.rpm
python-debuginfo-2.4.3-46.el5_8.2.s390x.rpm
python-devel-2.4.3-46.el5_8.2.s390.rpm
python-devel-2.4.3-46.el5_8.2.s390x.rpm
python-libs-2.4.3-46.el5_8.2.s390x.rpm
python-tools-2.4.3-46.el5_8.2.s390x.rpm
tkinter-2.4.3-46.el5_8.2.s390x.rpm

x86_64:
python-2.4.3-46.el5_8.2.x86_64.rpm
python-debuginfo-2.4.3-46.el5_8.2.i386.rpm
python-debuginfo-2.4.3-46.el5_8.2.x86_64.rpm
python-devel-2.4.3-46.el5_8.2.i386.rpm
python-devel-2.4.3-46.el5_8.2.x86_64.rpm
python-libs-2.4.3-46.el5_8.2.x86_64.rpm
python-tools-2.4.3-46.el5_8.2.x86_64.rpm
tkinter-2.4.3-46.el5_8.2.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2011-4940.html
https://www.redhat.com/security/data/cve/CVE-2011-4944.html
https://www.redhat.com/security/data/cve/CVE-2012-1150.html
https://access.redhat.com/security/updates/classification/#moderate
http://www.ocert.org/advisories/ocert-2011-003.html
https://rhn.redhat.com/errata/RHSA-2012-0731.html

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2012 Red Hat, Inc.
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