Debian LTS: DLA-3575-1 Critical Python Update Over Multiple Issues

CVE-2021-23336

Python was vulnerable to Web Cache Poisoning via urlparse.parse_qsl and
urlparse.parse_qs by using a vector called parameter cloaking. When the
attacker can separate query parameters using a semicolon (;), they can
cause a difference in the interpretation of the request between the proxy
(running with default configuration) and the server. This can result in
malicious requests being cached as completely safe ones, as the proxy would
usually not see the semicolon as a separator, and therefore would not
include it in a cache key of an unkeyed parameter.

CVE-2022-0391

The urlparse module helps break Uniform Resource Locator (URL) strings into
components. The issue involves how the urlparse method does not sanitize
input and allows characters like '\r' and '\n' in the URL path. This flaw
allows an attacker to input a crafted URL, leading to injection attacks.

CVE-2022-48560

A use-after-free exists in Python via heappushpop in heapq.