That's where this type of attack got its name: XML bombs are small files that enlarge when entities are expanded. So-called XML bombs are created in a similar way, by increasing the number of nested entities. Lollollollollollollollollollollollollollollollollollollollollollollol The 'lol2' entity expands as follows: lollollollollollollollollollollollollollollollollollollollollollollol We can increase the nesting and the number of entities. The value of the 'lol1' entity results in the 'lollol' string. We define the first one through a string, and the second one through other entities. The file contains the 'lol' and 'lol1' entities. In the latter case, they can be represented by a string or other entities, for example.Īn XML file with examples of such entities: Entities can either refer to some external resource or be fully defined inside the document. DTD allows us to define and use XML entities. XML files may contain the document type definition ( DTD). XEE attacks are included in OWASP Top 10 2017: A4:2017 – XML External Entities (XXE), and OWASP Top 10 2021: A05:2021 – Security Misconfiguration. This can make an application vulnerable to an XEE attack (also called a 'billion laughs' attack or an XML bombs attack). The analyzer has detected the use of an insecurely configured XML parser that processes external data.
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