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

Affected: PyPI: 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 comm…

Affected: PyPI: petl

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