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AUSCERT External Security Bulletin Redistribution
Python fixes insecure linking vulnerability
21 July 2020
AusCERT Security Bulletin Summary
Publisher: Python project
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
CVE Names: CVE-2020-15523
Comment: The US National Vulnerability Database advise that this affects
Python 3.6 through 3.6.10, 3.7 through 3.7.8, and
3.8 through 3.4.8rc1.
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Python 3.8.4 final
Release date: 2020-07-13
* bpo-41162: Audit hooks are now cleared later during finalization to avoid
* bpo-29778: Ensure python3.dll is loaded from correct locations when Python
is embedded (CVE-2020-15523).
Core and Builtins
* bpo-41247: Always cache the running loop holder when running
* bpo-41252: Fix incorrect refcounting in _ssl.c's _servername_callback().
* bpo-41218: Python 3.8.3 had a regression where compiling with
ast.PyCF_ALLOW_TOP_LEVEL_AWAIT would aggressively mark list comprehension
with CO_COROUTINE. Now only list comprehension making use of async/await
will tagged as so.
* bpo-41175: Guard against a NULL pointer dereference within bytearrayobject
triggered by the bytearray() + bytearray() operation.
* bpo-39960: The 'hackcheck' that prevents sneaking around a type's
__setattr__() by calling the superclass method was rewritten to allow C
implemented heap types.
* bpo-41235: Fix the error handling in ssl.SSLContext.load_dh_params().
* bpo-41193: The write_history() atexit function of the readline completer
now ignores any OSError to ignore error if the filesystem is read-only,
instead of only ignoring FileNotFoundError and PermissionError.
* bpo-41043: Fixed the use of glob() in the stdlib: literal part of the path
is now always correctly escaped.
* bpo-39384: Fixed email.contentmanager to allow set_content() to set a null
* bpo-37765: Add keywords to module name completion list. Rewrite Completions
section of IDLE doc.
* bpo-41152: The encoding of stdin, stdout and stderr in IDLE is now always
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