Headline
GHSA-6wxg-wh7f-rqpr: XML External Entity (XXE) vulnerability in apoc.import.graphml
Impact
A XML External Entity (XXE) vulnerability found in the apoc.import.graphml procedure of APOC core plugin in Neo4j graph database. XML External Entity (XXE) injection occurs when the XML parser allows external entities to be resolved. The XML parser used by the apoc.import.graphml procedure was not configured in a secure way and therefore allowed this.
External entities can be used to read local files, send HTTP requests, and perform denial-of-service attacks on the application.
Abusing the XXE vulnerability enabled assessors to read local files remotely. Although with the level of privileges assessors had this was limited to one-line files. With the ability to write to the database, any file could have been read. Additionally, assessors noted, with local testing, the server could be crashed by passing in improperly formatted XML.
Patches
The users should aim to use the latest released version compatible with their Neo4j version. The minimum versions containing patch for this vulnerability is 5.5.0.
Workarounds
If you cannot upgrade the library, you can control the allowlist of the procedures that can be used in your system.
For more information
If you have any questions or comments about this advisory:
- Open an issue in neo4j-apoc
- Email us at [email protected]
Credits
We want to publicly recognise the contribution of Christopher Schneider – State Farm.
- GitHub Advisory Database
- GitHub Reviewed
- CVE-2023-23926
XML External Entity (XXE) vulnerability in apoc.import.graphml
Moderate severity GitHub Reviewed Published Feb 16, 2023 in neo4j/apoc • Updated Feb 16, 2023
Package
maven org.neo4j.procedure:apoc-core (Maven)
Affected versions
< 5.5.0
Impact
A XML External Entity (XXE) vulnerability found in the apoc.import.graphml procedure of APOC core plugin in Neo4j graph database. XML External Entity (XXE) injection occurs when the XML parser allows external entities to be resolved. The XML parser used by the apoc.import.graphml procedure was not configured in a secure way and therefore allowed this.
External entities can be used to read local files, send HTTP requests, and perform denial-of-service attacks on the application.
Abusing the XXE vulnerability enabled assessors to read local files remotely. Although with the level of privileges assessors had this was limited to one-line files. With the ability to write to the database, any file could have been read. Additionally, assessors noted, with local testing, the server could be crashed by passing in improperly formatted XML.
Patches
The users should aim to use the latest released version compatible with their Neo4j version. The minimum versions containing patch for this vulnerability is 5.5.0.
Workarounds
If you cannot upgrade the library, you can control the allowlist of the procedures that can be used in your system.
For more information
If you have any questions or comments about this advisory:
- Open an issue in neo4j-apoc
- Email us at [email protected]
Credits
We want to publicly recognise the contribution of Christopher Schneider – State Farm.
References
- GHSA-6wxg-wh7f-rqpr
- https://nvd.nist.gov/vuln/detail/CVE-2023-23926
- neo4j/apoc#310
- neo4j/apoc@f175f1f
- https://github.com/neo4j/apoc/releases/tag/5.5.0
- https://neo4j.com/docs/operations-manual/current/reference/configuration-settings/#config_dbms.security.procedures.allowlist
Published by the National Vulnerability Database
Feb 16, 2023
Published to the GitHub Advisory Database
Feb 16, 2023
Last updated
Feb 16, 2023
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APOC (Awesome Procedures on Cypher) is an add-on library for Neo4j. An XML External Entity (XXE) vulnerability found in the apoc.import.graphml procedure of APOC core plugin prior to version 5.5.0 in Neo4j graph database. XML External Entity (XXE) injection occurs when the XML parser allows external entities to be resolved. The XML parser used by the apoc.import.graphml procedure was not configured in a secure way and therefore allowed this. External entities can be used to read local files, send HTTP requests, and perform denial-of-service attacks on the application. Abusing the XXE vulnerability enabled assessors to read local files remotely. Although with the level of privileges assessors had this was limited to one-line files. With the ability to write to the database, any file could have been read. Additionally, assessors noted, with local testing, the server could be crashed by passing in improperly formatted XML. The minimum version containing a patch for this vulnerability is 5...