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XXE in UpdateMessageReader.java via Man-in-the-Middle (MitM) #829

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ProDigySML opened this Issue Sep 29, 2018 · 0 comments

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ProDigySML commented Sep 29, 2018

The Issue

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.

Where the Issue Occurred

The following code snippets display the usage of XMLReader without securely disabling entities:

An attacker can Man-in-the-Middle (MitM) the HTTP call to the URL below:

private static final String DEFAULT_UPDATE_URL = "http://update.frostwire.com";

Remediation

https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Prevention_Cheat_Sheet

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