CVE-2023-27476: XML External Entity (XXE) Injection in OWSLib
First published: Tue Mar 07 2023(Updated: )
### Impact OWSLib's XML parser (which supports both `lxml` and `xml.etree`) does not disable entity resolution for `lxml`, and could lead to arbitrary file reads from an attacker-controlled XML payload. This affects all XML parsing in the codebase. ### Patches - Use only lxml for XML handling, adding `resolve_entities=False` to `lxml`'s parser: https://github.com/geopython/OWSLib/pull/863 ### Workarounds ```python patch_well_known_namespaces(etree) etree.set_default_parser( parser=etree.XMLParser(resolve_entities=False) ) ``` ### References - [`GHSL-2022-131`](https://securitylab.github.com/advisories/GHSL-2022-131_OWSLib/)
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Osgeo Owslib | <0.28.1 | |
| debian/owslib | <=0.17.1-1 | 0.17.1-1+deb10u1 0.23.0-1+deb11u1 0.27.2-3 0.29.2-1 |
| pip/OWSLib | <0.28.1 | 0.28.1 |
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Reference Links
- https://security-tracker.debian.org/tracker/CVE-2023-27476
- https://github.com/geopython/OWSLib/commit/d91267303a695d69e73fa71efa100a035852a063
- https://www.cve.org/CVERecord?id=CVE-2023-27476
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1034182
- https://github.com/geopython/OWSLib/pull/863/commits/b92687702be9576c0681bb11cad21eb631b9122f
- https://github.com/geopython/OWSLib/security/advisories/GHSA-8h9c-r582-mggc
- https://lists.debian.org/debian-lts-announce/2023/06/msg00032.html
- https://securitylab.github.com/advisories/GHSL-2022-131_owslib/
- https://www.debian.org/security/2023/dsa-5426
- https://github.com/geopython/OWSLib/commit/b0c687544ddc213d8dcd4a056139b63451938b21
- https://securitylab.github.com/advisories/GHSL-2022-131_OWSLib/
- https://github.com/geopython/OWSLib/pull/863
- https://github.com/geopython/OWSLib/releases/tag/0.28.1
- https://nvd.nist.gov/vuln/detail/CVE-2023-27476
- https://github.com/pypa/advisory-database/tree/main/vulns/owslib/PYSEC-2023-86.yaml
- https://securitylab.github.com/advisories/GHSL-2022-131_owslib
- https://github.com/advisories/GHSA-8h9c-r582-mggc (Advisory)
Frequently Asked Questions
What is CVE-2023-27476?
CVE-2023-27476 is a vulnerability in the OWSLib Python package that allows arbitrary file reads from the file system.
How does CVE-2023-27476 occur?
CVE-2023-27476 occurs because OWSLib's XML parser does not disable entity resolution.
What is the severity of CVE-2023-27476?
CVE-2023-27476 has a severity rating of 7.5 (high).
Which versions of OWSLib are affected by CVE-2023-27476?
OWSLib versions up to and including 0.28.1 are affected by CVE-2023-27476.
How can I fix CVE-2023-27476?
To fix CVE-2023-27476, update OWSLib to version 0.29.2-1 or higher.
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