Use Safe Defaults for `lxml` Parsers

pixeebot[bot] commented 7 months ago

This codemod configures safe parameter values when initializing lxml.etree.XMLParser, lxml.etree.ETCompatXMLParser, lxml.etree.XMLTreeBuilder, or lxml.etree.XMLPullParser. If parameters resolve_entities, no_network, and dtd_validation are not set to safe values, your code may be vulnerable to entity expansion attacks and external entity (XXE) attacks.

Parameters no_network and dtd_validation have safe default values of True and False, respectively, so this codemod will set each to the default safe value if your code has assigned either to an unsafe value.

Parameter resolve_entities has an unsafe default value of True. This codemod will set resolve_entities=False if set to True or omitted.

The changes look as follows:

  import lxml.etree

- parser = lxml.etree.XMLParser()
- parser = lxml.etree.XMLParser(resolve_entities=True)
- parser = lxml.etree.XMLParser(resolve_entities=True, no_network=False, dtd_validation=True)
+ parser = lxml.etree.XMLParser(resolve_entities=False)
+ parser = lxml.etree.XMLParser(resolve_entities=False)
+ parser = lxml.etree.XMLParser(resolve_entities=False, no_network=True, dtd_validation=False)

Micro-Learning Topic: External entity injection (Detected by phrase)

Matched on "XXE"

What is this? (2min video)

An XML External Entity attack is a type of attack against an application that parses XML input. This attack occurs when XML input containing a reference to an external entity is processed by a weakly configured XML parser. This attack may lead to the disclosure of confidential data, denial of service, server-side request forgery, port scanning from the perspective of the machine where the parser is located, and other system impacts.

Try a challenge in Secure Code Warrior

Helpful references

OWASP XML External Entity (XXE) Processing - OWASP community page with comprehensive information about XML external entity attacks, and links to various OWASP resources to help detect or prevent it.
MSDN Security Briefs - XML Denial of Service Attacks and Defenses - An MSDN Magazine article that goes into detail on XML entity attacks and how to defend against them.
OWASP XML External Entity Prevention Cheat Sheet - This article is focused on providing clear, simple, actionable guidance for preventing XML external entity flaws in your applications.

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cr-gpt[bot] commented 7 months ago

Seems you are using me but didn't get OPENAI_API_KEY seted in Variables/Secrets for this repo. you could follow readme for more information

git-greetings[bot] commented 7 months ago

PR Details of @pixeebot[bot] in nasa-fprime :	OPEN	CLOSED	TOTAL
2	1	3

2lambda123 / nasa-fprime