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Meaning - it would probably fail during the parsing process? Privacy policy About OWASP Disclaimers XML External Entity (XXE) Prevention Cheat Sheet From OWASP Jump to: navigation, search Last revision (mm/dd/yy): 05/31/2016 1 Introduction 1.1 General Guidance 1.2 C/C++ 1.2.1 libxml2 The file contents can be parsed from web server logs or from an actual page. But if you were to use a DOMSource or StAXSource instead, it would be up to you to configure those sources to be safe from XXE. .NET The following information for

Per the 'NSXMLDocument External Entity Restriction API' section of: iOS4 and earlier: All external entities are loaded by default. Do not include external entities by setting this feature to false. All rights reserved. 800 Washington Ave N Suite 670 Minneapolis, MN 55401 612.465.8880 Phone 888.270.0317 612.455.6988 Fax Follow Us On XML External Entity (XXE) Processing From OWASP Jump to: navigation, Therefore, the XML processor should be configured to use a local static DTD and disallow any declared DTD included in the XML document.

Since the attack occurs relative to the application processing the XML document, an attacker may use this trusted application to pivot to other internal systems, possibly disclosing other internal content via C/C++ libxml2 The Enum xmlParserOption should not have the following options defined: XML_PARSE_NOENT: Expands entities and substitutes them with replacement text XML_PARSE_DTDLOAD: Load the external DTD Note: Per:, starting with For more information on XXE, please visit XML External Entity (XXE) Processing. This article will describe XML External Entity (XXE) injection attack and its basics in order to provide you with a better understanding of the attack and how to deal with it.

Detailed XXE Prevention guidance for a number of languages and commonly used XML parsers in those languages is provided below. Required fields are marked *Comment Name * Email * Website Article By Antti Rantasaari Related Articles Playing with Content-Type – XXE on JSON Endpoints Advisory: XXE Injection in Oracle Database (CVE-2014-6577) For a syntax highlighted code snippet for SAXParserFactory, click here. Your cache administrator is webmaster.

This can make simple XXE attacks harder. The standard defines a concept called an entity, which is a storage unit of some type. iOS5 and later: Only entities that don't require network access are loaded. (which is safer) However, to completely disable XXE in an NSXMLDocument in any version of iOS you simply specify Following the previous overview, we said that we can reference data from an external entity by using SYSTEM identifier.

Request a one-on-one presentation. PostgreSQL (all) error-based XXE 0day Recently we found and published at PHDays PostgreSQL 0day error-based XXE vulnerability. If connections are allowed to remote systems from the vulnerable server then it’s possible to use an external DTD to extract local files via web requests. Link...

If the system identifier contains tainted data and the XML processor dereferences this tainted data, the XML processor may disclose confidential information normally not accessible by the application. Visit our official website! 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 A DTD is a set of markup declarations that define a document type for XML (also HTML and SGML).

static void LoadXML() { string xml = "] >&win;"; XmlDocument xmlDoc = new XmlDocument(); xmlDoc.XmlResolver = null; // Setting this to NULL disables DTDs - Please test and verify their XML parser is secure against XXE by default. Please try the request again. To do this, we need to declare an external entity inside the XML document.

Spring Framework MVC/OXM XXE Vulnerabilities For example, some XXE vulnerabilities was found in Spring OXM and Spring MVC. Your cache administrator is webmaster. However, NSXMLDocument provides some additional protections against XXE that aren't available in libxml2 directly. Moving Pen Testing Forward - In-depth, deep dive, manual testing by experts – powered by NetSPI’s CorrelatedVM Engine Copyright 2015 by NetSPI.

HTTP Request: POST /netspi HTTP/1.1 Host: Accept: application/json Content-Type: application/xml Content-Length: 288 ]> name &xxe; Other attacks can access local resources that may not stop returning data, possibly impacting application availability if too many threads or processes are not released. 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 Note that the application does not need to explicitly return the response to the attacker for it to be vulnerable to information disclosures.

We can determine its value internally (internal subset): Or from an external source: (external Subset): Noticed the SYSTEM identifier? Example: DoS: select xmlparse(document ']>&abc;') SSRF: select xmlparse(document ']>&abc;') Error-based XXE: select xmlparse(document 'E Cheat Sheets Developer / Builder 3rd Party Javascript To set this value yourself, it looks like this: XmlReaderSettings settings = new XmlReaderSettings(); settings.DtdProcessing = DtdProcessing.Prohibit; XmlReader reader = XmlReader.Create(stream, settings); Alternatively, you can set the DtdProcessing property to Ignore,

Here's what they say: For a DOMSource, the XML has already been parsed by user code and that code is responsible for protecting against XXE. External entities refer to data that an XML processor has to parse. However, the version of libxml2 provided up through iOS6 is prior to version 2.9 of libxml2 (which protects against XXE by default). In some cases it’s also possible to make data extraction easier by forcing an error on the server by adding an invalid URI to the request.  Below is an example of

The XML processor is configured to resolve external entities within the DTD. which, when included, allow similar external resource inclusion style attacks. The following versions of the Spring Framework are vulnerable to XXE: 3.0.0 to 3.2.3 (Spring OXM & Spring MVC) 4.0.0.M1 (Spring OXM) 4.0.0.M1-4.0.0.M2 (Spring MVC) There were other issues as well The features can either be set on the factory or the underlying XMLReader setFeature method.

The XML processor then replaces occurrences of the named external entity with the contents dereferenced by the system identifier. This attack occurs when XML input containing a reference to an external entity is processed by a weakly configured XML parser. The ProhibitDtd property has been deprecated in favor of the new DtdProcessing property. In order for the application to work with these self-descriptive XML messages, it has to parse them and check that the format is correct.

Do not include external DTDs by setting this feature to false. References OWASP XML External Entity (XXE) Prevention Cheat Sheet Timothy Morgan's 2014 Paper: XML Schema, DTD, and Entity Attacks - A Compendium of Known Techniques Precursor presentation of above paper - Case Studies Discover how NetSPI delivers deeper testing, better services, and additional benefits to real clients in a variety of industries. As I said before, every parser has different abilities and therefore we can come up with different exploits: Based on this table, presented by the researcher Timothy Morgan – these protocols

Now it may be possible to extract the contents of /etc/passwd file without having a reflection point on the page itself, but by reading incoming traffic on The invalid file path causes a “FileNotFoundException”, and an error message that contains /etc/passwd file contents. This same technique was recently covered in this Drupal XXE whitepaper as well but as I had the blog Please try the request again. This identifier means that the entity is going to fetch the content from an external source, which in this case is a page under “”.

This vulnerability has many different types and behaviors because it might occur in different types of technologies – therefore different types of XML parsers. Xerces 2 Features: Disallow an inline DTD by setting this feature to true. Content is available under a Creative Commons 3.0 License unless otherwise noted.