Update dependency aiohttp to v3.9.4 [SECURITY]

[platform-engineering-bot]

This PR contains the following updates:

Package	Update	Change
aiohttp	patch	==3.9.1 -> ==3.9.4

GitHub Vulnerability Alerts

CVE-2024-23829

Summary

Security-sensitive parts of the Python HTTP parser retained minor differences in allowable character sets, that must trigger error handling to robustly match frame boundaries of proxies in order to protect against injection of additional requests. Additionally, validation could trigger exceptions that were not handled consistently with processing of other malformed input.

Details

These problems are rooted in pattern matching protocol elements, previously improved by PR #​3235 and GHSA-gfw2-4jvh-wgfg:

1. The expression HTTP/(\d).(\d) lacked another backslash to clarify that the separator should be a literal dot, not just any Unicode code point (result: HTTP/(\d)\.(\d)).

2. The HTTP version was permitting Unicode digits, where only ASCII digits are standards-compliant.

3. Distinct regular expressions for validating HTTP Method and Header field names were used - though both should (at least) apply the common restrictions of rfc9110 token.

PoC

GET / HTTP/1ö1
GET / HTTP/1.𝟙
GET/: HTTP/1.1
Content-Encoding?: chunked

Impact

Primarily concerns running an aiohttp server without llhttp:

1. behind a proxy: Being more lenient than internet standards require could, depending on deployment environment, assist in request smuggling.
2. directly accessible or exposed behind proxies relaying malformed input: the unhandled exception could cause excessive resource consumption on the application server and/or its logging facilities.

---

Patch: https://github.com/aio-libs/aiohttp/pull/8074/files

CVE-2024-23334

Summary

Improperly configuring static resource resolution in aiohttp when used as a web server can result in the unauthorized reading of arbitrary files on the system.

Details

When using aiohttp as a web server and configuring static routes, it is necessary to specify the root path for static files. Additionally, the option 'follow_symlinks' can be used to determine whether to follow symbolic links outside the static root directory. When 'follow_symlinks' is set to True, there is no validation to check if a given file path is within the root directory.This can lead to directory traversal vulnerabilities, resulting in unauthorized access to arbitrary files on the system, even when symlinks are not present.

i.e. An application is only vulnerable with setup code like:

app.router.add_routes([
    web.static("/static", "static/", follow_symlinks=True),  # Remove follow_symlinks to avoid the vulnerability
])

Impact

This is a directory traversal vulnerability with CWE ID 22. When using aiohttp as a web server and enabling static resource resolution with follow_symlinks set to True, it can lead to this vulnerability. This vulnerability has been present since the introduction of the follow_symlinks parameter.

Workaround

Even if upgrading to a patched version of aiohttp, we recommend following these steps regardless.

If using follow_symlinks=True outside of a restricted local development environment, disable the option immediately. This option is NOT needed to follow symlinks which point to a location within the static root directory, it is only intended to allow a symlink to break out of the static directory. Even with this CVE fixed, there is still a substantial risk of misconfiguration when using this option on a server that accepts requests from remote users.

Additionally, aiohttp has always recommended using a reverse proxy server (such as nginx) to handle static resources and not to use these static resources in aiohttp for production environments. Doing so also protects against this vulnerability, and is why we expect the number of affected users to be very low.

---

Patch: https://github.com/aio-libs/aiohttp/pull/8079/files

CVE-2024-27306

Summary

A XSS vulnerability exists on index pages for static file handling.

Details

When using web.static(..., show_index=True), the resulting index pages do not escape file names.

If users can upload files with arbitrary filenames to the static directory, the server is vulnerable to XSS attacks.

Workaround

We have always recommended using a reverse proxy server (e.g. nginx) for serving static files. Users following the recommendation are unaffected.

Other users can disable show_index if unable to upgrade.

---

Patch: https://github.com/aio-libs/aiohttp/pull/8319/files

CVE-2024-30251

Summary

An attacker can send a specially crafted POST (multipart/form-data) request. When the aiohttp server processes it, the server will enter an infinite loop and be unable to process any further requests.

Impact

An attacker can stop the application from serving requests after sending a single request.

---

For anyone needing to patch older versions of aiohttp, the minimum diff needed to resolve the issue is (located in _read_chunk_from_length()):

diff --git a/aiohttp/multipart.py b/aiohttp/multipart.py
index 227be605c..71fc2654a 100644
--- a/aiohttp/multipart.py
+++ b/aiohttp/multipart.py
@​@​ -338,6 +338,8 @​@​ class BodyPartReader:
         assert self._length is not None, "Content-Length required for chunked read"
         chunk_size = min(size, self._length - self._read_bytes)
         chunk = await self._content.read(chunk_size)
+        if self._content.at_eof():
+            self._at_eof = True
         return chunk
 
     async def _read_chunk_from_stream(self, size: int) -> bytes:

This does however introduce some very minor issues with handling form data. So, if possible, it would be recommended to also backport the changes in:
aio-libs/aiohttp@cebe526
aio-libs/aiohttp@7eecdff
aio-libs/aiohttp@f21c6f2

---

Release Notes

aio-libs/aiohttp (aiohttp)

v3.9.4

Compare Source

==================

Bug fixes

• The asynchronous internals now set the underlying causes
  when assigning exceptions to the future objects
  -- by :user:webknjaz.

  Related issues and pull requests on GitHub:
  :issue:8089.

• Treated values of Accept-Encoding header as case-insensitive when checking
  for gzip files -- by :user:steverep.

  Related issues and pull requests on GitHub:
  :issue:8104.

• Improved the DNS resolution performance on cache hit -- by :user:bdraco.

  This is achieved by avoiding an :mod:asyncio task creation in this case.

  Related issues and pull requests on GitHub:
  :issue:8163.

• Changed the type annotations to allow dict on :meth:aiohttp.MultipartWriter.append,
  :meth:aiohttp.MultipartWriter.append_json and
  :meth:aiohttp.MultipartWriter.append_form -- by :user:cakemanny

  Related issues and pull requests on GitHub:
  :issue:7741.

• Ensure websocket transport is closed when client does not close it
  -- by :user:bdraco.

  The transport could remain open if the client did not close it. This
  change ensures the transport is closed when the client does not close
  it.

  Related issues and pull requests on GitHub:
  :issue:8200.

• Leave websocket transport open if receive times out or is cancelled
  -- by :user:bdraco.

  This restores the behavior prior to the change in #​7978.

  Related issues and pull requests on GitHub:
  :issue:8251.

• Fixed content not being read when an upgrade request was not supported with the pure Python implementation.
  -- by :user:bdraco.

  Related issues and pull requests on GitHub:
  :issue:8252.

• Fixed a race condition with incoming connections during server shutdown -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  :issue:8271.

• Fixed multipart/form-data compliance with :rfc:7578 -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  :issue:8280.

• Fixed blocking I/O in the event loop while processing files in a POST request
  -- by :user:bdraco.

  Related issues and pull requests on GitHub:
  :issue:8283.

• Escaped filenames in static view -- by :user:bdraco.

  Related issues and pull requests on GitHub:
  :issue:8317.

• Fixed the pure python parser to mark a connection as closing when a
  response has no length -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  :issue:8320.

Features

• Upgraded llhttp to 9.2.1, and started rejecting obsolete line folding
  in Python parser to match -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  :issue:8146, :issue:8292.

Deprecations (removal in next major release)

• Deprecated content_transfer_encoding parameter in :py:meth:FormData.add_field() <aiohttp.FormData.add_field> -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  :issue:8280.

Improved documentation

• Added a note about canceling tasks to avoid delaying server shutdown -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  :issue:8267.

Contributor-facing changes

• The pull request template is now asking the contributors to
  answer a question about the long-term maintenance challenges
  they envision as a result of merging their patches
  -- by :user:webknjaz.

  Related issues and pull requests on GitHub:
  :issue:8099.

• Updated CI and documentation to use NPM clean install and upgrade
  node to version 18 -- by :user:steverep.

  Related issues and pull requests on GitHub:
  :issue:8116.

• A pytest fixture hello_txt was introduced to aid
  static file serving tests in
  :file:test_web_sendfile_functional.py. It dynamically
  provisions hello.txt file variants shared across the
  tests in the module.

  -- by :user:steverep

  Related issues and pull requests on GitHub:
  :issue:8136.

Packaging updates and notes for downstreams

• Added an internal pytest marker for tests which should be skipped
  by packagers (use -m 'not internal' to disable them) -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  :issue:8299.

---

v3.9.3

Compare Source

==================

Bug fixes

• Fixed backwards compatibility breakage (in 3.9.2) of ssl parameter when set outside
  of ClientSession (e.g. directly in TCPConnector) -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  :issue:8097, :issue:8098.

Miscellaneous internal changes

• Improved test suite handling of paths and temp files to consistently use pathlib and pytest fixtures.

  Related issues and pull requests on GitHub:
  :issue:3957.

---

v3.9.2

Compare Source

==================

Bug fixes

• Fixed server-side websocket connection leak.

  Related issues and pull requests on GitHub:
  :issue:7978.

• Fixed web.FileResponse doing blocking I/O in the event loop.

  Related issues and pull requests on GitHub:
  :issue:8012.

• Fixed double compress when compression enabled and compressed file exists in server file responses.

  Related issues and pull requests on GitHub:
  :issue:8014.

• Added runtime type check for ClientSession timeout parameter.

  Related issues and pull requests on GitHub:
  :issue:8021.

• Fixed an unhandled exception in the Python HTTP parser on header lines starting with a colon -- by :user:pajod.

  Invalid request lines with anything but a dot between the HTTP major and minor version are now rejected.
  Invalid header field names containing question mark or slash are now rejected.
  Such requests are incompatible with :rfc:9110#section-5.6.2 and are not known to be of any legitimate use.

  Related issues and pull requests on GitHub:
  :issue:8074.

• Improved validation of paths for static resources requests to the server -- by :user:bdraco.

  Related issues and pull requests on GitHub:
  :issue:8079.

Features

• Added support for passing :py:data:True to ssl parameter in ClientSession while
  deprecating :py:data:None -- by :user:xiangyan99.

  Related issues and pull requests on GitHub:
  :issue:7698.

Breaking changes

• Fixed an unhandled exception in the Python HTTP parser on header lines starting with a colon -- by :user:pajod.

  Invalid request lines with anything but a dot between the HTTP major and minor version are now rejected.
  Invalid header field names containing question mark or slash are now rejected.
  Such requests are incompatible with :rfc:9110#section-5.6.2 and are not known to be of any legitimate use.

  Related issues and pull requests on GitHub:
  :issue:8074.

Improved documentation

• Fixed examples of fallback_charset_resolver function in the :doc:client_advanced document. -- by :user:henry0312.

  Related issues and pull requests on GitHub:
  :issue:7995.

• The Sphinx setup was updated to avoid showing the empty
  changelog draft section in the tagged release documentation
  builds on Read The Docs -- by :user:webknjaz.

  Related issues and pull requests on GitHub:
  :issue:8067.

Packaging updates and notes for downstreams

• The changelog categorization was made clearer. The
  contributors can now mark their fragment files more
  accurately -- by :user:webknjaz.

  The new category tags are:

  * ``bugfix``
  
  * ``feature``
  
  * ``deprecation``
  
  * ``breaking`` (previously, ``removal``)
  
  * ``doc``
  
  * ``packaging``
  
  * ``contrib``
  
  * ``misc``
  

  Related issues and pull requests on GitHub:
  :issue:8066.

Contributor-facing changes

• Updated :ref:contributing/Tests coverage <aiohttp-contributing> section to show how we use codecov -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  :issue:7916.

• The changelog categorization was made clearer. The
  contributors can now mark their fragment files more
  accurately -- by :user:webknjaz.

  The new category tags are:

  * ``bugfix``
  
  * ``feature``
  
  * ``deprecation``
  
  * ``breaking`` (previously, ``removal``)
  
  * ``doc``
  
  * ``packaging``
  
  * ``contrib``
  
  * ``misc``
  

  Related issues and pull requests on GitHub:
  :issue:8066.

Miscellaneous internal changes

• Replaced all tmpdir fixtures with tmp_path in test suite.

  Related issues and pull requests on GitHub:
  :issue:3551.

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[qixiang]

Closing old PRs.