1.115. python

Updated python packages that fix multiple security issues, several bugs, and add two enhancements are now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having low 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.

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

It was found that many applications embedding the Python interpreter did not specify a valid full path to the script or application when calling the PySys_SetArgv API function, which could result in the addition of the current working directory to the module search path (sys.path). A local attacker able to trick a victim into running such an application in an attacker-controlled directory could use this flaw to execute code with the victim's privileges. This update adds the PySys_SetArgvEx API. Developers can modify their applications to use this new API, which sets sys.argv without modifying sys.path. (CVE-2008-5983)

Multiple flaws were found in the Python rgbimg module. If an application written in Python was using the rgbimg module and loaded a specially-crafted SGI image file, it could cause the application to crash or, possibly, execute arbitrary code with the privileges of the user running the application. (CVE-2009-4134, CVE-2010-1449, CVE-2010-1450)

Multiple flaws were found in the Python audioop module. Supplying certain inputs could cause the audioop module to crash or, possibly, execute arbitrary code. (CVE-2010-1634, CVE-2010-2089)

This update also fixes the following bugs:

* When starting a child process from the subprocess module in Python 2.4, the parent process could leak file descriptors if an error occurred. This update resolves the issue. ( BZ#609017)

* Prior to Python 2.7, programs that used "ulimit -n" to enable communication with large numbers of subprocesses could still monitor only 1024 file descriptors at a time, which caused an exception:

ValueError: filedescriptor out of range in select()

This was due to the subprocess module using the "select" system call. The module now uses the "poll" system call, removing this limitation. ( BZ#609020)

* Prior to Python 2.5, the tarfile module failed to unpack tar files if the path was longer than 100 characters. This update backports the tarfile module from Python 2.5 and the issue no longer occurs. ( BZ#263401)

* The email module incorrectly implemented the logic for obtaining attachment file names: the get_filename() fallback for using the deprecated "name" parameter of the "Content-Type" header erroneously used the "Content-Disposition" header. This update backports a fix from Python 2.6, which resolves this issue. ( BZ#644147)

* Prior to version 2.5, Python's optimized memory allocator never released memory back to the system. The memory usage of a long-running Python process would resemble a "high-water mark". This update backports a fix from Python 2.5a1, which frees unused arenas, and adds a non-standard sys._debugmallocstats() function, which prints diagnostic information to stderr. Finally, when running under Valgrind, the optimized allocator is deactivated, to allow more convenient debugging of Python memory usage issues. ( BZ#569093)

* The urllib and urllib2 modules ignored the no_proxy variable, which could lead to programs such as "yum" erroneously accessing a proxy server for URLs covered by a "no_proxy" exclusion. This update backports fixes of urllib and urllib2, which respect the "no_proxy" variable, which fixes these issues. ( BZ#549372)

As well, this update adds the following enhancements:

* This update introduces a new python-libs package, subsuming the majority of the content of the core python package. This makes both 32-bit and 64-bit Python libraries available on PowerPC systems. ( BZ#625372)

* The python-libs.i386 package is now available for 64-bit Itanium with the 32-bit Itanium compatibility mode. ( BZ#644761)

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

Updated python packages that resolve an issue with the "email" module are now available.

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).

These updated python packages provide fixes for the following bug:

* Prior to this update, the "email" module incorrectly implemented part of the logic for obtaining file names of attachments, and as a result, get_filename()'s fallback for using the "Content-Type" header's deprecated "name" parameter erroneously used the "Content-Disposition" header instead. This update applies a patch from Python 2.6, fixing this problem. ( BZ#649250)

All users of Python are advised to upgrade to these updated packages, which resolve this issue.

Updated python packages that resolve several issues are now available.

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).

These updated python packages provide fixes for the following bugs:

* Previously, Python 2.4's "subprocess" module contained a bug where a Python process could leak file descriptors if an error occurred when starting a child process. With this update, the Python process no longer leaks file descriptors. ( BZ#630663)

* Prior to Python 2.7, the "subprocess" module used the "select" system call when connecting to the streams of child processes. This operation failed with a ValueError exception (ValueError: filedescriptor out of range in select()) when more file descriptors were open in the python process than the limit defined by the FD_SETSIZE macro in the <sys/select.h> header (typically 1024). With this update, the module was ported to use the "poll" system call, removing this limit. ( BZ#630832)

* Prior to Python 2.5, the "tarfile" module would fail to unpack tar files with a path longer than 100 characters. This update backports Python 2.5's "tarfile" module, fixing this problem. ( BZ#631816)

All users of python are advised to upgrade to these updated packages, which resolve these issues.