CVE-2023-40587

Pyramid is an open source Python web framework. A path traversal
vulnerability in Pyramid versions 2.0.0 and 2.0.1 impacts users of Python
3.11 that are using a Pyramid static view with a full filesystem path and
have a index.html file that is located exactly one directory above the
location of the static view’s file system path. No further path traversal
exists, and the only file that could be disclosed accidentally is
index.html. Pyramid version 2.0.2 rejects any path that contains a
null-byte out of caution. While valid in directory/file names, we would
strongly consider it a mistake to use null-bytes in naming
files/directories. Secondly, Python 3.11, and 3.12 has fixed the underlying
issue in os.path.normpath to no longer truncate on the first 0x00
found, returning the behavior to pre-3.11 Python, un an as of yet
unreleased version. Fixes will be available in:Python 3.12.0rc2 and 3.11.5.
Some workarounds are available. Use a version of Python 3 that is not
affected, downgrade to Python 3.10 series temporarily, or wait until Python
3.11.5 is released and upgrade to the latest version of Python 3.11 series.

Notes