python39:3.9 and python39-devel:3.9 security update

Python is an interpreted, interactive, object-oriented programming language,
which includes modules, classes, exceptions, very high level dynamic data types
and dynamic typing. Python supports interfaces to many system calls and
libraries, as well as to various windowing systems.

Security Fix(es):

python: Information disclosure via pydoc (CVE-2021-3426)
python: urllib: Regular expression DoS in AbstractBasicAuthHandler
(CVE-2021-3733)
python-lxml: Missing input sanitization for formaction HTML5 attributes may
lead to XSS (CVE-2021-28957)
python-ipaddress: Improper input validation of octal strings
(CVE-2021-29921)
python-urllib3: ReDoS in the parsing of authority part of URL
(CVE-2021-33503)
python-pip: Incorrect handling of unicode separators in git references
(CVE-2021-3572)
python: urllib: HTTP client possible infinite loop on a 100 Continue
response (CVE-2021-3737)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE page(s)
listed in the References section.

CVE(s):
CVE-2021-28957
An XSS vulnerability was discovered in python-lxml's clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
CVE-2021-29921
In Python before 3,9,5, the ipaddress library mishandles leading zero characters in the octets of an IP address string. This (in some situations) allows attackers to bypass access control that is based on IP addresses.
CVE-2021-33503
An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.
CVE-2021-3426
There's a flaw in Python 3's pydoc. A local or adjacent attacker who discovers or is able to convince another local or adjacent user to start a pydoc server could access the server and use it to disclose sensitive information belonging to the other user that they would not normally be able to access. The highest risk of this flaw is to data confidentiality. This flaw affects Python versions before 3.8.9, Python versions before 3.9.3 and Python versions before 3.10.0a7.
CVE-2021-3572
A flaw was found in python-pip in the way it handled Unicode separators in git references. A remote attacker could possibly use this issue to install a different revision on a repository. The highest threat from this vulnerability is to data integrity. This is fixed in python-pip version 21.1.
CVE-2021-3733
** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.
CVE-2021-3737
** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.

Modularity name: python39
Stream name: 3.9