Introduced protections against XXE attacks

[pixeebot[bot]]

This change updates all instances of XMLInputFactory to prevent them from resolving external entities, which can protect you from arbitrary code execution, sensitive data exfiltration, and probably a bunch more evil things attackers are still discovering.

Without this protection, attackers can cause your XMLInputFactory parser to retrieve sensitive information with attacks like this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE foo [ <!ENTITY xxe SYSTEM "file:///etc/passwd"> ]>
<book>
    <title>&xxe;</title>
</book>

Yes, it's pretty insane that this is the default behavior. Our change hardens the factories created with the necessary security features to prevent your parser from resolving external entities.

+ import io.github.pixee.security.XMLInputFactorySecurity;
  ...
- XMLInputFactory xmlInputFactory = XMLInputFactory.newFactory();
+ XMLInputFactory xmlInputFactory = XMLInputFactorySecurity.hardenFactory(XMLInputFactory.newFactory());

You could take our protections one step further by changing our supplied code to prevent the user from supplying a DOCTYPE, which is more aggressive and more secure, but also more likely to affect existing code behavior:

+ import io.github.pixee.security.XMLInputFactorySecurity;
+ import io.github.pixee.security.XMLRestrictions;
  ...
  XMLInputFactory xmlInputFactory = XMLInputFactorySecurity.hardenFactory(XMLInputFactory.newFactory(), XMLRestrictions.DISALLOW_DOCTYPE);

More reading

* [https://cheatsheetseries.owasp.org/cheatsheets/XML_External_Entity_Prevention_Cheat_Sheet.html](https://cheatsheetseries.owasp.org/cheatsheets/XML_External_Entity_Prevention_Cheat_Sheet.html) * [https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing](https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing) * [https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/XXE%20Injection/README.md](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/XXE%20Injection/README.md)

I have additional improvements ready for this repo! If you want to see them, leave the comment:

@pixeebot next

... and I will open a new PR right away!

🧚🤖Powered by Pixeebot (codemod ID: pixee:java/harden-xmlinputfactory)

[cr-gpt[bot]]

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

[secure-code-warrior-for-github[bot]]

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.

[codesyncapp[bot]]

Check out the playback for this Pull Request here.

[performance-testing-bot[bot]]

Unable to locate .performanceTestingBot config file

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[pixeebot[bot]]

This change may not be a priority right now, so I'll close it. If there was something I could have done better, please let me know!

You can also customize me to make sure I'm working with you in the way you want.