Kelly-Anne Kidston
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The structure of an XML file is defined by the XML 1.0 standard. An entity is an XML storage unit. This concept is defined in the XML 1.0 standard. One of the many types is an entity. An external general/parameter parsed entities (often abbreviated to external entity) can access remote or local content through a defined system identifier. The system identifier is assumed to be a URI that can be dereferenced (accessed) by the XML processor when processing the entity 😉 The XML processor then replaces occurrences of the named external entity with the contents dereferenced by the system identifier 😎 If the system identifier is contaminated with tainted information and the XML process dereferences that tainted content, the XML processing may reveal confidential information not normally accessible to the application. External DTDs and external stylesheets can be used to attack similar vectors. These, when added, permit similar style attacks on external resources.
External Entity: You can extend your existing list of valid entities by adding new ones. An entity that is defined by a URI is an external entity. Unless otherwise configured, any external entity forces the XML Parser to access any resource specified by the URI. This could be a local file or a remote system. The behaviorexposes the application for XML eXternal Entity attacks (XXE), which could be used to denial-of-service the local system, gain unauthorized file access on the local machine and scan remote computers. Last modified by Sopheap Valadez from Lokoja (Nigeria) 76 days ago
Owasp.org It is also mentioned that external entities are possible by adding new entities to the’s having existing set. The entity can be called external entity if the definition of the entity includes a URI. Unless the URI is specified, the XML parser will access any resource that the external entity specifies, e.g. A file on the remote machine or local machine. This behaviourr exposes the application for XML eXternal Entity attacks (XXE), which could be used to denial-of-service the local system, gain unauthorized file access on the local machine and scan remote computers to denial the service to remote systems. Marline Breen edited this article on February 5, 2021.
External Entity: You can extend your existing list of valid entities by adding new ones. The entity can be called external if the definition is a URI. Unless otherwise configured, any external entity forces the XML Parser to access any resource specified by the URI. This could be a local file or a remote system. The behaviorexposes the application for XML eXternal Entity attacks (XXE), which could be used to denial-of-service the local system, gain unauthorized file access on the local machine, scan remote computers, or denial of services to remote systems.
