Update dependency lxml to v4.9.1 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
lxml (source, changelog)	==4.4.1 -> ==4.9.1

GitHub Vulnerability Alerts

CVE-2020-27783

A XSS vulnerability was discovered in python-lxml's clean module. The module's parser didn't properly imitate browsers, which caused different behaviors between the sanitizer and the user's page. A remote attacker could exploit this flaw to run arbitrary HTML/JS code.

CVE-2021-28957

An XSS vulnerability was discovered in the python lxml clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.

CVE-2021-43818

Impact

The HTML Cleaner in lxml.html lets certain crafted script content pass through, as well as script content in SVG files embedded using data URIs.

Users that employ the HTML cleaner in a security relevant context should upgrade to lxml 4.6.5.

Patches

The issue has been resolved in lxml 4.6.5.

Workarounds

None.

References

The issues are tracked under the report IDs GHSL-2021-1037 and GHSL-2021-1038.

CVE-2022-2309

NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered.

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Release Notes

lxml/lxml (lxml)

v4.9.1

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Bugs fixed

• A crash was resolved when using iterwalk() (or canonicalize())
  after parsing certain incorrect input. Note that iterwalk() can crash
  on valid input parsed with the same parser after failing to parse the
  incorrect input.

v4.9.0

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Bugs fixed

• GH#341: The mixin inheritance order in lxml.html was corrected.
  Patch by xmo-odoo.

Other changes

• Built with Cython 0.29.30 to adapt to changes in Python 3.11 and 3.12.

• Wheels include zlib 1.2.12, libxml2 2.9.14 and libxslt 1.1.35
  (libxml2 2.9.12+ and libxslt 1.1.34 on Windows).

• GH#343: Windows-AArch64 build support in Visual Studio.
  Patch by Steve Dower.

v4.8.0

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Features added

• GH#337: Path-like objects are now supported throughout the API instead of just strings.
  Patch by Henning Janssen.

• The ElementMaker now supports QName values as tags, which always override
  the default namespace of the factory.

Bugs fixed

• GH#338: In lxml.objectify, the XSI float annotation "nan" and "inf" were spelled in
  lower case, whereas XML Schema datatypes define them as "NaN" and "INF" respectively.
  Patch by Tobias Deiminger.

Other changes

• Built with Cython 0.29.28.

v4.7.1

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Features added

• Chunked Unicode string parsing via parser.feed() now encodes the input data
  to the native UTF-8 encoding directly, instead of going through Py_UNICODE /
  wchar_t encoding first, which previously required duplicate recoding in most cases.

Bugs fixed

• The standard namespace prefixes were mishandled during "C14N2" serialisation on Python 3.
  See https://mail.python.org/archives/list/[email protected]/thread/6ZFBHFOVHOS5GFDOAMPCT6HM5HZPWQ4Q/

• lxml.objectify previously accepted non-XML numbers with underscores (like "1_000")
  as integers or float values in Python 3.6 and later. It now adheres to the number
  format of the XML spec again.

• LP#1939031: Static wheels of lxml now contain the header files of zlib and libiconv
  (in addition to the already provided headers of libxml2/libxslt/libexslt).

Other changes

• Wheels include libxml2 2.9.12+ and libxslt 1.1.34 (also on Windows).

v4.6.5

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Bugs fixed

• A vulnerability (GHSL-2021-1038) in the HTML cleaner allowed sneaking script
  content through SVG images (CVE-2021-43818).

• A vulnerability (GHSL-2021-1037) in the HTML cleaner allowed sneaking script
  content through CSS imports and other crafted constructs (CVE-2021-43818).

v4.6.4

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Features added

• GH#317: A new property system_url was added to DTD entities.
  Patch by Thirdegree.

• GH#314: The STATIC_* variables in setup.py can now be passed via env vars.
  Patch by Isaac Jurado.

v4.6.3

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Bugs fixed

• A vulnerability (CVE-2021-28957) was discovered in the HTML Cleaner by Kevin Chung,
  which allowed JavaScript to pass through. The cleaner now removes the HTML5
  formaction attribute.

v4.6.2

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Bugs fixed

• A vulnerability (CVE-2020-27783) was discovered in the HTML Cleaner by Yaniv Nizry,
  which allowed JavaScript to pass through. The cleaner now removes more sneaky
  "style" content.

v4.6.1

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Bugs fixed

• A vulnerability was discovered in the HTML Cleaner by Yaniv Nizry, which allowed
  JavaScript to pass through. The cleaner now removes more sneaky "style" content.

v4.6.0

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Features added

• GH#310: lxml.html.InputGetter supports __len__() to count the number of input fields.
  Patch by Aidan Woolley.

• lxml.html.InputGetter has a new .items() method to ease processing all input fields.

• lxml.html.InputGetter.keys() now returns the field names in document order.

• GH-309: The API documentation is now generated using sphinx-apidoc.
  Patch by Chris Mayo.

Bugs fixed

• LP#1869455: C14N 2.0 serialisation failed for unprefixed attributes
  when a default namespace was defined.

• TreeBuilder.close() raised AssertionError in some error cases where it
  should have raised XMLSyntaxError. It now raises a combined exception to
  keep up backwards compatibility, while switching to XMLSyntaxError as an
  interface.

v4.5.2

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Bugs fixed

• Cleaner() now validates that only known configuration options can be set.

• LP#1882606: Cleaner.clean_html() discarded comments and PIs regardless of the
  corresponding configuration option, if remove_unknown_tags was set.

• LP#1880251: Instead of globally overwriting the document loader in libxml2, lxml now
  sets it per parser run, which improves the interoperability with other users of libxml2
  such as libxmlsec.

• LP#1881960: Fix build in CPython 3.10 by using Cython 0.29.21.

• The setup options "--with-xml2-config" and "--with-xslt-config" were accidentally renamed
  to "--xml2-config" and "--xslt-config" in 4.5.1 and are now available again.

v4.5.1

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Bugs fixed

• LP#1570388: Fix failures when serialising documents larger than 2GB in some cases.

• LP#1865141, GH#298: QName values were not accepted by the el.iter() method.
  Patch by xmo-odoo.

• LP#1863413, GH#297: The build failed to detect libraries on Linux that are only
  configured via pkg-config.
  Patch by Hugh McMaster.

v4.5.0

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Features added

• A new function indent() was added to insert tail whitespace for pretty-printing
  an XML tree.

Bugs fixed

• LP#1857794: Tail text of nodes that get removed from a document using item
  deletion disappeared silently instead of sticking with the node that was removed.

Other changes

• MacOS builds are 64-bit-only by default.
  Set CFLAGS and LDFLAGS explicitly to override it.

• Linux/MacOS Binary wheels now use libxml2 2.9.10 and libxslt 1.1.34.

• LP#1840234: The package version number is now available as lxml.__version__.

v4.4.3

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Bugs fixed

• LP#1844674: itertext() was missing tail text of comments and PIs since 4.4.0.

v4.4.2

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Bugs fixed

• LP#1835708: ElementInclude incorrectly rejected repeated non-recursive
  includes as recursive.
  Patch by Rainer Hausdorf.

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