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Red Hat Security Advisory 2015-2101-01

Red Hat Security Advisory 2015-2101-01
Posted Nov 20, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-2101-01 - Python is an interpreted, interactive, object-oriented programming language often compared to Tcl, Perl, Scheme, or Java. Python includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. It was discovered that the Python xmlrpclib module did not restrict the size of gzip-compressed HTTP responses. A malicious XMLRPC server could cause an XMLRPC client using xmlrpclib to consume an excessive amount of memory.

tags | advisory, java, web, perl, python
systems | linux, redhat
advisories | CVE-2013-1752, CVE-2013-1753, CVE-2014-4616, CVE-2014-4650, CVE-2014-7185
SHA-256 | cc582ebc49e27cc4fafe81b106e309a23e455c02652176ce97cad6da6638b90a

Red Hat Security Advisory 2015-2101-01

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=====================================================================
Red Hat Security Advisory

Synopsis: Moderate: python security, bug fix, and enhancement update
Advisory ID: RHSA-2015:2101-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-2101.html
Issue date: 2015-11-19
CVE Names: CVE-2013-1752 CVE-2013-1753 CVE-2014-4616
CVE-2014-4650 CVE-2014-7185
=====================================================================

1. Summary:

Updated python packages that fix multiple security issues, several bugs,
and add various enhancements are now available for Red Hat Enterprise
Linux 7.

Red Hat Product Security 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:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

Python is an interpreted, interactive, object-oriented programming language
often compared to Tcl, Perl, Scheme, or Java. Python includes modules,
classes, exceptions, very high level dynamic data types and dynamic typing.
Python supports interfaces to many system calls and libraries, as well as
to various windowing systems (X11, Motif, Tk, Mac and MFC).

It was discovered that the Python xmlrpclib module did not restrict the
size of gzip-compressed HTTP responses. A malicious XMLRPC server could
cause an XMLRPC client using xmlrpclib to consume an excessive amount of
memory. (CVE-2013-1753)

It was discovered that multiple Python standard library modules
implementing network protocols (such as httplib or smtplib) failed to
restrict the sizes of server responses. A malicious server could cause a
client using one of the affected modules to consume an excessive amount of
memory. (CVE-2013-1752)

It was discovered that the CGIHTTPServer module incorrectly handled URL
encoded paths. A remote attacker could use this flaw to execute scripts
outside of the cgi-bin directory, or disclose the source code of the
scripts in the cgi-bin directory. (CVE-2014-4650)

An integer overflow flaw was found in the way the buffer() function handled
its offset and size arguments. An attacker able to control these arguments
could use this flaw to disclose portions of the application memory or cause
it to crash. (CVE-2014-7185)

A flaw was found in the way the json module handled negative index
arguments passed to certain functions (such as raw_decode()). An attacker
able to control the index value passed to one of the affected functions
could possibly use this flaw to disclose portions of the application
memory. (CVE-2014-4616)

The Python standard library HTTP client modules (such as httplib or urllib)
did not perform verification of TLS/SSL certificates when connecting to
HTTPS servers. A man-in-the-middle attacker could use this flaw to hijack
connections and eavesdrop or modify transferred data. (CVE-2014-9365)

Note: The Python standard library was updated to make it possible to enable
certificate verification by default. However, for backwards compatibility,
verification remains disabled by default. Future updates may change this
default. Refer to the Knowledgebase article 2039753 linked to in the
References section for further details about this change. (BZ#1219108)

This update also fixes the following bugs:

* Subprocesses used with the Eventlet library or regular threads previously
tried to close epoll file descriptors twice, which led to an "Invalid
argument" error. Subprocesses have been fixed to close the file descriptors
only once. (BZ#1103452)

* When importing the readline module from a Python script, Python no longer
produces erroneous random characters on stdout. (BZ#1189301)

* The cProfile utility has been fixed to print all values that the "-s"
option supports when this option is used without a correct value.
(BZ#1237107)

* The load_cert_chain() function now accepts "None" as a keyfile argument.
(BZ#1250611)

In addition, this update adds the following enhancements:

* Security enhancements as described in PEP 466 have been backported to the
Python standard library, for example, new features of the ssl module:
Server Name Indication (SNI) support, support for new TLSv1.x protocols,
new hash algorithms in the hashlib module, and many more. (BZ#1111461)

* Support for the ssl.PROTOCOL_TLSv1_2 protocol has been added to the ssl
library. (BZ#1192015)

* The ssl.SSLSocket.version() method is now available to access information
about the version of the SSL protocol used in a connection. (BZ#1259421)

All python users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues and add these
enhancements.

4. Solution:

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

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

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

1046170 - CVE-2013-1753 python: XMLRPC library unrestricted decompression of HTTP responses using gzip enconding
1046174 - CVE-2013-1752 python: multiple unbound readline() DoS flaws in python stdlib
1058482 - tmpwatch removes python multiprocessing sockets
1112285 - CVE-2014-4616 python: missing boundary check in JSON module
1113527 - CVE-2014-4650 python: CGIHTTPServer module does not properly handle URL-encoded path separators in URLs
1146026 - CVE-2014-7185 python: buffer() integer overflow leading to out of bounds read
1173041 - CVE-2014-9365 python: failure to validate certificates in the HTTP client with TLS (PEP 476)
1177613 - setup.py bdist_rpm NameError: global name 'get_python_version' is not defined
1181624 - multiprocessing BaseManager serve_client() does not check EINTR on recv
1237107 - cProfile main() traceback if options syntax is invalid
1250611 - SSLContext.load_cert_chain() keyfile argument can't be set to None
1259421 - Backport SSLSocket.version() to python 2.7.5

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
python-2.7.5-34.el7.src.rpm

x86_64:
python-2.7.5-34.el7.x86_64.rpm
python-debuginfo-2.7.5-34.el7.i686.rpm
python-debuginfo-2.7.5-34.el7.x86_64.rpm
python-libs-2.7.5-34.el7.i686.rpm
python-libs-2.7.5-34.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
python-debug-2.7.5-34.el7.x86_64.rpm
python-debuginfo-2.7.5-34.el7.x86_64.rpm
python-devel-2.7.5-34.el7.x86_64.rpm
python-test-2.7.5-34.el7.x86_64.rpm
python-tools-2.7.5-34.el7.x86_64.rpm
tkinter-2.7.5-34.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
python-2.7.5-34.el7.src.rpm

x86_64:
python-2.7.5-34.el7.x86_64.rpm
python-debuginfo-2.7.5-34.el7.i686.rpm
python-debuginfo-2.7.5-34.el7.x86_64.rpm
python-devel-2.7.5-34.el7.x86_64.rpm
python-libs-2.7.5-34.el7.i686.rpm
python-libs-2.7.5-34.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
python-debug-2.7.5-34.el7.x86_64.rpm
python-debuginfo-2.7.5-34.el7.x86_64.rpm
python-test-2.7.5-34.el7.x86_64.rpm
python-tools-2.7.5-34.el7.x86_64.rpm
tkinter-2.7.5-34.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
python-2.7.5-34.el7.src.rpm

aarch64:
python-2.7.5-34.el7.aarch64.rpm
python-debuginfo-2.7.5-34.el7.aarch64.rpm
python-devel-2.7.5-34.el7.aarch64.rpm
python-libs-2.7.5-34.el7.aarch64.rpm

ppc64:
python-2.7.5-34.el7.ppc64.rpm
python-debuginfo-2.7.5-34.el7.ppc.rpm
python-debuginfo-2.7.5-34.el7.ppc64.rpm
python-devel-2.7.5-34.el7.ppc64.rpm
python-libs-2.7.5-34.el7.ppc.rpm
python-libs-2.7.5-34.el7.ppc64.rpm

ppc64le:
python-2.7.5-34.el7.ppc64le.rpm
python-debuginfo-2.7.5-34.el7.ppc64le.rpm
python-devel-2.7.5-34.el7.ppc64le.rpm
python-libs-2.7.5-34.el7.ppc64le.rpm

s390x:
python-2.7.5-34.el7.s390x.rpm
python-debuginfo-2.7.5-34.el7.s390.rpm
python-debuginfo-2.7.5-34.el7.s390x.rpm
python-devel-2.7.5-34.el7.s390x.rpm
python-libs-2.7.5-34.el7.s390.rpm
python-libs-2.7.5-34.el7.s390x.rpm

x86_64:
python-2.7.5-34.el7.x86_64.rpm
python-debuginfo-2.7.5-34.el7.i686.rpm
python-debuginfo-2.7.5-34.el7.x86_64.rpm
python-devel-2.7.5-34.el7.x86_64.rpm
python-libs-2.7.5-34.el7.i686.rpm
python-libs-2.7.5-34.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

aarch64:
python-debug-2.7.5-34.el7.aarch64.rpm
python-debuginfo-2.7.5-34.el7.aarch64.rpm
python-test-2.7.5-34.el7.aarch64.rpm
python-tools-2.7.5-34.el7.aarch64.rpm
tkinter-2.7.5-34.el7.aarch64.rpm

ppc64:
python-debug-2.7.5-34.el7.ppc64.rpm
python-debuginfo-2.7.5-34.el7.ppc64.rpm
python-test-2.7.5-34.el7.ppc64.rpm
python-tools-2.7.5-34.el7.ppc64.rpm
tkinter-2.7.5-34.el7.ppc64.rpm

ppc64le:
python-debug-2.7.5-34.el7.ppc64le.rpm
python-debuginfo-2.7.5-34.el7.ppc64le.rpm
python-test-2.7.5-34.el7.ppc64le.rpm
python-tools-2.7.5-34.el7.ppc64le.rpm
tkinter-2.7.5-34.el7.ppc64le.rpm

s390x:
python-debug-2.7.5-34.el7.s390x.rpm
python-debuginfo-2.7.5-34.el7.s390x.rpm
python-test-2.7.5-34.el7.s390x.rpm
python-tools-2.7.5-34.el7.s390x.rpm
tkinter-2.7.5-34.el7.s390x.rpm

x86_64:
python-debug-2.7.5-34.el7.x86_64.rpm
python-debuginfo-2.7.5-34.el7.x86_64.rpm
python-test-2.7.5-34.el7.x86_64.rpm
python-tools-2.7.5-34.el7.x86_64.rpm
tkinter-2.7.5-34.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
python-2.7.5-34.el7.src.rpm

x86_64:
python-2.7.5-34.el7.x86_64.rpm
python-debuginfo-2.7.5-34.el7.i686.rpm
python-debuginfo-2.7.5-34.el7.x86_64.rpm
python-devel-2.7.5-34.el7.x86_64.rpm
python-libs-2.7.5-34.el7.i686.rpm
python-libs-2.7.5-34.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
python-debug-2.7.5-34.el7.x86_64.rpm
python-debuginfo-2.7.5-34.el7.x86_64.rpm
python-test-2.7.5-34.el7.x86_64.rpm
python-tools-2.7.5-34.el7.x86_64.rpm
tkinter-2.7.5-34.el7.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/

7. References:

https://access.redhat.com/security/cve/CVE-2013-1752
https://access.redhat.com/security/cve/CVE-2013-1753
https://access.redhat.com/security/cve/CVE-2014-4616
https://access.redhat.com/security/cve/CVE-2014-4650
https://access.redhat.com/security/cve/CVE-2014-7185
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/articles/2039753
https://www.python.org/dev/peps/pep-0466/

8. Contact:

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

Copyright 2015 Red Hat, Inc.
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