Headline
GHSA-p6gg-5hf4-4rgj: Graylog vulnerable to instantiation of arbitrary classes triggered by API request
Summary
Arbitrary classes can be loaded and instantiated using a HTTP PUT request to the /api/system/cluster_config/
endpoint.
Details
Graylog’s cluster config system uses fully qualified class names as config keys. To validate the existence of the requested class before using them, Graylog loads the class using the class loader.
https://github.com/Graylog2/graylog2-server/blob/e458db8bf4f789d4d19f1b37f0263f910c8d036c/graylog2-server/src/main/java/org/graylog2/rest/resources/system/ClusterConfigResource.java#L208-L214
PoC
A request of the following form will output the content of the /etc/passwd
file:
curl -u admin:<admin-password> -X PUT http://localhost:9000/api/system/cluster_config/java.io.File \
-H "Content-Type: application/json" \
-H "X-Requested-By: poc" \
-d '"/etc/passwd"'
To perform the request, authorization is required. Only users posessing the clusterconfigentry:create
and clusterconfigentry:edit
permissions are allowed to do so. These permissions are usually only granted to Admin
users.
Impact
If a user with the appropriate permissions performs the request, arbitrary classes with 1-arg String constructors can be instantiated.
This will execute arbitrary code that is run during class instantiation.
In the specific use case of java.io.File
, the behaviour of the internal web-server stack will lead to information exposure by including the entire file content in the response to the REST request.
Credits
Analysis provided by Fabian Yamaguchi - Whirly Labs (Pty) Ltd
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- GitHub Advisory Database
- GitHub Reviewed
- CVE-2024-24824
Graylog vulnerable to instantiation of arbitrary classes triggered by API request
High severity GitHub Reviewed Published Feb 7, 2024 in Graylog2/graylog2-server • Updated Feb 7, 2024
Package
maven org.graylog2:graylog2-server (Maven)
Affected versions
>= 2.0.0, < 5.1.11
>= 5.2.0-alpha.1, < 5.2.4
Patched versions
5.1.11
5.2.4
Description
Published to the GitHub Advisory Database
Feb 7, 2024