Arch Linux: 201906-17 High Severity: Python Information Disclosure

Arch Linux Security Advisory ASA-201906-17
=========================================
Severity: High
Date    : 2019-06-18
CVE-ID  : CVE-2019-9636
Package : python
Type    : information disclosure
Remote  : Yes
Link    : https://security.archlinux.org/AVG-977

Summary
======
The package python before version 3.7.3-1 is vulnerable to information
disclosure.

Resolution
=========
Upgrade to 3.7.3-1.

# pacman -Syu "python>=3.7.3-1"

The problem has been fixed upstream in version 3.7.3.

Workaround
=========
None.

Description
==========
Python 2.7.x through 2.7.16 and 3.x through 3.7.2 is affected by
improper Handling of Unicode Encoding (with an incorrect netloc) during
NFKC normalization. A specially crafted URL could be incorrectly parsed
by urllib.parse.urlsplit and urllib.parse.urlparse to locate cookies or
authentication data and send that information to a different host than
when parsed correctly.

Impact
=====
A remote attacker is able to use a specially crafted URL to locate and
disclose cookies or authentication data.

References
=========
https://python-security.readthedocs.io/vuln/urlsplit-nfkc-normalization.html
https://github.com/python/cpython/commit/daad2c482c91de32d8305abbccc76a5de8b3a8be
https://github.com/python/cpython/commit/f61599b050c621386a3fc6bc480359e2d3bb93de
https://security.archlinux.org/CVE-2019-9636