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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.2460
                Python fixes insecure linking vulnerability
                               21 July 2020

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Python
Publisher:         Python project
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-15523  

Original Bulletin: 
   https://docs.python.org/3/whatsnew/changelog.html#python-3-8-4-final
   https://nvd.nist.gov/vuln/detail/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

Security

  * bpo-41162: Audit hooks are now cleared later during finalization to avoid
    missing events.

  * 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 
    asyncio.set_running_loop.

  * 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.

Library

  * 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
    string.

IDLE

  * 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
    UTF-8.

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