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2to3.html
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__future__.html
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__main__.html
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abc.html
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aifc.html
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allos.html
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archiving.html
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argparse.html
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array.html
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ast.html
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asynchat.html
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asyncio-dev.html
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asyncio-eventloop.html
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asyncio-protocol.html
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asyncio-queue.html
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asyncio-stream.html
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asyncio-subprocess.html
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asyncio-sync.html
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asyncio-task.html
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asyncio.html
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asyncore.html
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atexit.html
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audioop.html
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base64.html
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bdb.html
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binary.html
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binascii.html
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bisect.html
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builtins.html
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bz2.html
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calendar.html
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cgi.html
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cgitb.html
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cmath.html
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cmd.html
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code.html
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codecs.html
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codeop.html
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collections.abc.html
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collections.html
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colorsys.html
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compileall.html
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concurrency.html
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concurrent.futures.html
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concurrent.html
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configparser.html
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constants.html
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contextlib.html
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copy.html
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crypt.html
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crypto.html
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csv.html
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ctypes.html
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curses.ascii.html
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datatypes.html
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datetime.html
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dbm.html
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debug.html
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development.html
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difflib.html
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dis.html
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distribution.html
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distutils.html
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doctest.html
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dummy_threading.html
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email.charset.html
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email.compat32-message.html
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email.contentmanager.html
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email.errors.html
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email.examples.html
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email.generator.html
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email.header.html
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email.headerregistry.html
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email.html
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email.iterators.html
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email.message.html
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email.mime.html
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email.parser.html
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email.policy.html
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email.util.html
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ensurepip.html
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enum.html
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errno.html
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exceptions.html
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faulthandler.html
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fcntl.html
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filecmp.html
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fileformats.html
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fileinput.html
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filesys.html
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fnmatch.html
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formatter.html
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fpectl.html
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fractions.html
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frameworks.html
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ftplib.html
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functional.html
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functions.html
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functools.html
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gc.html
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getopt.html
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getpass.html
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gettext.html
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glob.html
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grp.html
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gzip.html
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hashlib.html
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heapq.html
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hmac.html
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html.entities.html
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html.html
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html.parser.html
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i18n.html
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idle.html
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imp.html
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importlib.html
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index.html
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inspect.html
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keyword.html
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locale.html
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lzma.html
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macpath.html
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mailbox.html
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marshal.html
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math.html
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mimetypes.html
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misc.html
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modules.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>20.4. XML Processing Modules — Python 3.6.7 documentation</title> <link rel="stylesheet" href="../_static/pydoctheme.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 3.6.7 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="20.5. xml.etree.ElementTree — The ElementTree XML API" href="xml.etree.elementtree.html" /> <link rel="prev" title="20.3. html.entities — Definitions of HTML general entities" href="html.entities.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/3/library/xml.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="xml.etree.elementtree.html" title="20.5. xml.etree.ElementTree — The ElementTree XML API" accesskey="N">next</a> |</li> <li class="right" > <a href="html.entities.html" title="20.3. html.entities — Definitions of HTML general entities" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">3.6.7 Documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="markup.html" accesskey="U">20. Structured Markup Processing Tools</a> »</li> <li class="right"> <div class="inline-search" style="display: none" role="search"> <form class="inline-search" action="../search.html" method="get"> <input placeholder="Quick search" type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> <script type="text/javascript">$('.inline-search').show(0);</script> | </li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="module-xml"> <span id="xml-processing-modules"></span><span id="xml"></span><h1>20.4. XML Processing Modules<a class="headerlink" href="#module-xml" title="Permalink to this headline">¶</a></h1> <p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.6/Lib/xml/">Lib/xml/</a></p> <hr class="docutils" /> <p>Python’s interfaces for processing XML are grouped in the <code class="docutils literal notranslate"><span class="pre">xml</span></code> package.</p> <div class="admonition warning"> <p class="first admonition-title">Warning</p> <p class="last">The XML modules are not secure against erroneous or maliciously constructed data. If you need to parse untrusted or unauthenticated data see the <a class="reference internal" href="#xml-vulnerabilities"><span class="std std-ref">XML vulnerabilities</span></a> and <a class="reference internal" href="#defused-packages"><span class="std std-ref">The defusedxml and defusedexpat Packages</span></a> sections.</p> </div> <p>It is important to note that modules in the <a class="reference internal" href="#module-xml" title="xml: Package containing XML processing modules"><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml</span></code></a> package require that there be at least one SAX-compliant XML parser available. The Expat parser is included with Python, so the <a class="reference internal" href="pyexpat.html#module-xml.parsers.expat" title="xml.parsers.expat: An interface to the Expat non-validating XML parser."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.parsers.expat</span></code></a> module will always be available.</p> <p>The documentation for the <a class="reference internal" href="xml.dom.html#module-xml.dom" title="xml.dom: Document Object Model API for Python."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.dom</span></code></a> and <a class="reference internal" href="xml.sax.html#module-xml.sax" title="xml.sax: Package containing SAX2 base classes and convenience functions."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.sax</span></code></a> packages are the definition of the Python bindings for the DOM and SAX interfaces.</p> <p>The XML handling submodules are:</p> <ul class="simple"> <li><a class="reference internal" href="xml.etree.elementtree.html#module-xml.etree.ElementTree" title="xml.etree.ElementTree: Implementation of the ElementTree API."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.etree.ElementTree</span></code></a>: the ElementTree API, a simple and lightweight XML processor</li> </ul> <ul class="simple"> <li><a class="reference internal" href="xml.dom.html#module-xml.dom" title="xml.dom: Document Object Model API for Python."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.dom</span></code></a>: the DOM API definition</li> <li><a class="reference internal" href="xml.dom.minidom.html#module-xml.dom.minidom" title="xml.dom.minidom: Minimal Document Object Model (DOM) implementation."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.dom.minidom</span></code></a>: a minimal DOM implementation</li> <li><a class="reference internal" href="xml.dom.pulldom.html#module-xml.dom.pulldom" title="xml.dom.pulldom: Support for building partial DOM trees from SAX events."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.dom.pulldom</span></code></a>: support for building partial DOM trees</li> </ul> <ul class="simple"> <li><a class="reference internal" href="xml.sax.html#module-xml.sax" title="xml.sax: Package containing SAX2 base classes and convenience functions."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.sax</span></code></a>: SAX2 base classes and convenience functions</li> <li><a class="reference internal" href="pyexpat.html#module-xml.parsers.expat" title="xml.parsers.expat: An interface to the Expat non-validating XML parser."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.parsers.expat</span></code></a>: the Expat parser binding</li> </ul> <div class="section" id="xml-vulnerabilities"> <span id="id1"></span><h2>20.4.1. XML vulnerabilities<a class="headerlink" href="#xml-vulnerabilities" title="Permalink to this headline">¶</a></h2> <p>The XML processing modules are not secure against maliciously constructed data. An attacker can abuse XML features to carry out denial of service attacks, access local files, generate network connections to other machines, or circumvent firewalls.</p> <p>The following table gives an overview of the known attacks and whether the various modules are vulnerable to them.</p> <table border="1" class="docutils"> <colgroup> <col width="26%" /> <col width="15%" /> <col width="16%" /> <col width="15%" /> <col width="15%" /> <col width="15%" /> </colgroup> <thead valign="bottom"> <tr class="row-odd"><th class="head">kind</th> <th class="head">sax</th> <th class="head">etree</th> <th class="head">minidom</th> <th class="head">pulldom</th> <th class="head">xmlrpc</th> </tr> </thead> <tbody valign="top"> <tr class="row-even"><td>billion laughs</td> <td><strong>Vulnerable</strong></td> <td><strong>Vulnerable</strong></td> <td><strong>Vulnerable</strong></td> <td><strong>Vulnerable</strong></td> <td><strong>Vulnerable</strong></td> </tr> <tr class="row-odd"><td>quadratic blowup</td> <td><strong>Vulnerable</strong></td> <td><strong>Vulnerable</strong></td> <td><strong>Vulnerable</strong></td> <td><strong>Vulnerable</strong></td> <td><strong>Vulnerable</strong></td> </tr> <tr class="row-even"><td>external entity expansion</td> <td>Safe (4)</td> <td>Safe (1)</td> <td>Safe (2)</td> <td>Safe (4)</td> <td>Safe (3)</td> </tr> <tr class="row-odd"><td><a class="reference external" href="https://en.wikipedia.org/wiki/Document_type_definition">DTD</a> retrieval</td> <td>Safe (4)</td> <td>Safe</td> <td>Safe</td> <td>Safe (4)</td> <td>Safe</td> </tr> <tr class="row-even"><td>decompression bomb</td> <td>Safe</td> <td>Safe</td> <td>Safe</td> <td>Safe</td> <td><strong>Vulnerable</strong></td> </tr> </tbody> </table> <ol class="arabic simple"> <li><a class="reference internal" href="xml.etree.elementtree.html#module-xml.etree.ElementTree" title="xml.etree.ElementTree: Implementation of the ElementTree API."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.etree.ElementTree</span></code></a> doesn’t expand external entities and raises a <code class="xref py py-exc docutils literal notranslate"><span class="pre">ParserError</span></code> when an entity occurs.</li> <li><a class="reference internal" href="xml.dom.minidom.html#module-xml.dom.minidom" title="xml.dom.minidom: Minimal Document Object Model (DOM) implementation."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.dom.minidom</span></code></a> doesn’t expand external entities and simply returns the unexpanded entity verbatim.</li> <li><code class="xref py py-mod docutils literal notranslate"><span class="pre">xmlrpclib</span></code> doesn’t expand external entities and omits them.</li> <li>Since Python 3.8.0, external general entities are no longer processed by default since Python.</li> </ol> <dl class="docutils"> <dt>billion laughs / exponential entity expansion</dt> <dd>The <a class="reference external" href="https://en.wikipedia.org/wiki/Billion_laughs">Billion Laughs</a> attack – also known as exponential entity expansion – uses multiple levels of nested entities. Each entity refers to another entity several times, and the final entity definition contains a small string. The exponential expansion results in several gigabytes of text and consumes lots of memory and CPU time.</dd> <dt>quadratic blowup entity expansion</dt> <dd>A quadratic blowup attack is similar to a <a class="reference external" href="https://en.wikipedia.org/wiki/Billion_laughs">Billion Laughs</a> attack; it abuses entity expansion, too. Instead of nested entities it repeats one large entity with a couple of thousand chars over and over again. The attack isn’t as efficient as the exponential case but it avoids triggering parser countermeasures that forbid deeply-nested entities.</dd> <dt>external entity expansion</dt> <dd>Entity declarations can contain more than just text for replacement. They can also point to external resources or local files. The XML parser accesses the resource and embeds the content into the XML document.</dd> <dt><a class="reference external" href="https://en.wikipedia.org/wiki/Document_type_definition">DTD</a> retrieval</dt> <dd>Some XML libraries like Python’s <a class="reference internal" href="xml.dom.pulldom.html#module-xml.dom.pulldom" title="xml.dom.pulldom: Support for building partial DOM trees from SAX events."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.dom.pulldom</span></code></a> retrieve document type definitions from remote or local locations. The feature has similar implications as the external entity expansion issue.</dd> <dt>decompression bomb</dt> <dd>Decompression bombs (aka <a class="reference external" href="https://en.wikipedia.org/wiki/Zip_bomb">ZIP bomb</a>) apply to all XML libraries that can parse compressed XML streams such as gzipped HTTP streams or LZMA-compressed files. For an attacker it can reduce the amount of transmitted data by three magnitudes or more.</dd> </dl> <p>The documentation for <a class="reference external" href="https://pypi.org/project/defusedxml/">defusedxml</a> on PyPI has further information about all known attack vectors with examples and references.</p> </div> <div class="section" id="the-defusedxml-and-defusedexpat-packages"> <span id="defused-packages"></span><h2>20.4.2. The <code class="xref py py-mod docutils literal notranslate"><span class="pre">defusedxml</span></code> and <code class="xref py py-mod docutils literal notranslate"><span class="pre">defusedexpat</span></code> Packages<a class="headerlink" href="#the-defusedxml-and-defusedexpat-packages" title="Permalink to this headline">¶</a></h2> <p><a class="reference external" href="https://pypi.org/project/defusedxml/">defusedxml</a> is a pure Python package with modified subclasses of all stdlib XML parsers that prevent any potentially malicious operation. Use of this package is recommended for any server code that parses untrusted XML data. The package also ships with example exploits and extended documentation on more XML exploits such as XPath injection.</p> <p><a class="reference external" href="https://pypi.org/project/defusedexpat/">defusedexpat</a> provides a modified libexpat and a patched <code class="xref py py-mod docutils literal notranslate"><span class="pre">pyexpat</span></code> module that have countermeasures against entity expansion DoS attacks. The <code class="xref py py-mod docutils literal notranslate"><span class="pre">defusedexpat</span></code> module still allows a sane and configurable amount of entity expansions. The modifications may be included in some future release of Python, but will not be included in any bugfix releases of Python because they break backward compatibility.</p> </div> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h3><a href="../contents.html">Table Of Contents</a></h3> <ul> <li><a class="reference internal" href="#">20.4. XML Processing Modules</a><ul> <li><a class="reference internal" href="#xml-vulnerabilities">20.4.1. XML vulnerabilities</a></li> <li><a class="reference internal" href="#the-defusedxml-and-defusedexpat-packages">20.4.2. The <code class="docutils literal notranslate"><span class="pre">defusedxml</span></code> and <code class="docutils literal notranslate"><span class="pre">defusedexpat</span></code> Packages</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="html.entities.html" title="previous chapter">20.3. <code class="docutils literal notranslate"><span class="pre">html.entities</span></code> — Definitions of HTML general entities</a></p> <h4>Next topic</h4> <p class="topless"><a href="xml.etree.elementtree.html" title="next chapter">20.5. <code class="docutils literal notranslate"><span class="pre">xml.etree.ElementTree</span></code> — The ElementTree XML API</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li> <a href="https://github.com/python/cpython/blob/3.6/Doc/library/xml.rst" rel="nofollow">Show Source </a> </li> </ul> </div> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="xml.etree.elementtree.html" title="20.5. xml.etree.ElementTree — The ElementTree XML API" >next</a> |</li> <li class="right" > <a href="html.entities.html" title="20.3. html.entities — Definitions of HTML general entities" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">3.6.7 Documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="markup.html" >20. 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