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HistoryMay 05, 2011 - 12:00 a.m.

(RHSA-2011:0491) Moderate: python security update


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Python is an interpreted, interactive, object-oriented programming

A flaw was found in the Python urllib and urllib2 libraries where they
would not differentiate between different target URLs when handling
automatic redirects. This caused Python applications using these modules to
follow any new URL that they understood, including the “file://” URL type.
This could allow a remote server to force a local Python application to
read a local file instead of the remote one, possibly exposing local files
that were not meant to be exposed. (CVE-2011-1521)

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)

A race condition was found in the way the Python smtpd module handled new
connections. A remote user could use this flaw to cause a Python script
using the smtpd module to terminate. (CVE-2010-3493)

An information disclosure flaw was found in the way the Python
CGIHTTPServer module processed certain HTTP GET requests. A remote attacker
could use a specially-crafted request to obtain the CGI script’s source
code. (CVE-2011-1015)

A buffer over-read flaw was found in the way the Python Expat parser
handled malformed UTF-8 sequences when processing XML files. A
specially-crafted XML file could cause Python applications using the Python
Expat parser to crash while parsing the file. (CVE-2009-3720)

This update makes Python use the system Expat library rather than its own
internal copy; therefore, users must have the version of Expat shipped with
RHSA-2009:1625 installed, or a later version, to resolve the CVE-2009-3720

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