CVE-2021-32828

The Nuxeo Platform is an open source content management platform for building business applications. In version 11.5.109, the oauth2 REST API is vulnerable to Reflected Cross-Site Scripting (XSS). This XSS can be escalated to Remote Code Execution (RCE) by levering the automation API.

Weakness

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

Potential Mitigations

• Make fields transient to protect them from deserialization.
• An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/586.html

References

• https://github.com/nuxeo/nuxeo/blob/master/modules/platform/nuxeo-platform-oauth/src/main/java/org/nuxeo/ecm/webengine/oauth2/OAuth2Callback.java
• https://securitylab.github.com/advisories/GHSL-2021-072-nuxeo
• https://github.com/nuxeo/nuxeo/blob/master/modules/platform/nuxeo-platform-oauth/src/main/java/org/nuxeo/ecm/webengine/oauth2/OAuth2Callback.java
• https://securitylab.github.com/advisories/GHSL-2021-072-nuxeo