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CVE-2019-9636

Public on 2019-03-08
Modified on 2019-11-22
Description

It was discovered that python's functions urllib.parse.urlsplit and urllib.parse.urlparse do not properly handle URLs encoded with Punycode/Internationalizing Domain Names in Applications (IDNA), which may result in a wrong domain name (specifically the netloc component of URL - user@domain:port) being returned by those functions. When an application parses user-supplied URLs to store cookies, authentication credentials, or other kind of information, it is possible for an attacker to provide specially crafted URLs to make the application locate host-related information (e.g. cookies, authentication data) and send them to a different host than where it should, unlike if the URLs had been correctly parsed. The result of an attack may vary based on the application.

Severity
Important
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CVSS v3 Base Score
9.8
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Core python 2019-06-25 21:04 ALAS2-2019-1230
Amazon Linux 1 python27 2019-06-25 21:32 ALAS-2019-1230
Amazon Linux 2 - Core python3 2019-05-02 18:48 ALAS2-2019-1204
Amazon Linux 1 python34 2019-11-19 17:31 ALAS-2019-1324
Amazon Linux 1 python34 2019-05-02 17:31 ALAS-2019-1202
Amazon Linux 1 python35 2019-07-17 23:51 ALAS-2019-1243
Amazon Linux 1 python36 2019-05-29 19:20 ALAS-2019-1204

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD CVSSv3 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD CVSSv2 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N