[ASA-201911-4] python2: information disclosure

[Christian Rebischke]

Arch Linux Security Advisory ASA-201911-4
=========================================

Severity: High
Date    : 2019-11-03
CVE-ID  : CVE-2019-9636
Package : python2
Type    : information disclosure
Remote  : Yes
Link    : https://security.archlinux.org/AVG-978

Summary
=======

The package python2 before version 2.7.17-1 is vulnerable to
information disclosure.

Resolution
==========

Upgrade to 2.7.17-1.

# pacman -Syu "python2>=2.7.17-1"

The problem has been fixed upstream in version 2.7.17.

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 craft a malicious URL and transfer private
data to a different host than expected.

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
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