Advisory Weakness Curation

XXE in petl ### Impact Information Disclosure ### Summary petl https://github.com/petl-developers/petl is a Python library that provides functions for extraction, transformation, and loading (ETL) of data. petl before 1.68, in some configurations, allows resolution of entities in XML input. An attacker who is able to submit XML input to an application using petl can disclose arbitrary files on the file system in the context of the user under which the application is running. ### Affected Applications Applications that: - accept attacker-supplied XML input that is processed using petl < 1.68 - return the response generated by petl back to the attacker - configure lxml as the underlying XML processing library used by petl - have read privileges in filesystem files with sensitive information ### Mitigation Update to petl >= 1.68 ### Workarounds - Assure there is no user/external access to the application using petl https://github.com/petl-developers/petl - Assure your application is not using the function fromxml() https://petl.readthedocs.io/en/stable/io.html#petl.io.xml.fromxml ### References - https://github.com/nvn1729/advisories/blob/master/cve-2020-29128.md - https://github.com/petl-developers/petl/pull/527 - https://github.com/petl-developers/petl/releases/tag/v1.6.8 - https://petl.readthedocs.io/en/stable/changes.html - https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing ### For more information If you have any questions or comments about this advisory: * Add a comment in the Github issue https://github.com/petl-developers/petl/pull/527 Thaks to Naveen Sunkavally.

XML Injection in petl petl before 1.68, in some configurations, allows resolution of entities in an XML document.