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GHSA-f5gc-p5m3-v347
No affected components available
Impact
Information Disclosure
Summary
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
- Assure your application is not using the function 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
Thaks to Naveen Sunkavally.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Active exploitation in the wild has been confirmed. Immediate patching or mitigation is required.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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