Python URL Parsing Flaw Enables Attacks That Insert Commands Into Webpages

urlparse has a parsing problem when the entire URL starts with blank characters.

This problem affects both the parsing of hostname and scheme, and eventually causes any blocklisting methods to fail.

A high-severity security flaw has been disclosed in the Python URL parsing function that could be exploited to bypass domain or protocol filtering methods implemented with a blocklist, ultimately resulting in arbitrary file reads and command execution.

The vulnerability can be expected to help SSRF and RCE in a wide range of scenarios.

CERT Coordination Center, CERT/CC says in an advisory.

Although blocklist is generally considered an inferior choice, there are many scenarios where blocklists still need, Cao said.

He emphasizes the importance of this vulnerability

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