CVE-2018-16153: Infoleak
An issue was discovered in Apereo Opencast 4.x through 10.x before 10.6. It sends system digest credentials during authentication attempts to arbitrary external services in some situations.
Other sources
The issue was mostly mitigated before, drastically reducing the risk. See references below for more information.
Impact
Opencast before version 10.6 will try to authenticate against any external services listed in a media package when it is trying to access the files, sending the global system user's credentials, regardless of the target being part of the Opencast cluster or not.
Previous mitigations already prevented clear text authentications for such requests (e.g. HTTP Basic authentication), but with enough malicious intent, even hashed credentials can be broken.
Patches
Opencast 10.6 will now send authentication requests only against servers which are part of the Opencast cluster, preventing external services from getting any form of authentication attempt in the first place.
Workarounds
No workaround available.
References
- Patch fixing the issue - Original security notice - Original security mitigation
For more information
If you have any questions or comments about this advisory: - Open an issue in our issue tracker - Email us at security@opencast.org
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2018-16153?
CVE-2018-16153 is considered a medium severity vulnerability due to the exposure of system digest credentials.
How do I fix CVE-2018-16153?
To fix CVE-2018-16153, upgrade Apereo Opencast to version 10.6 or later.
What systems are affected by CVE-2018-16153?
CVE-2018-16153 affects Apereo Opencast versions 4.x through 10.x before 10.6.
What issue does CVE-2018-16153 present?
CVE-2018-16153 allows system digest credentials to be sent during authentication attempts to arbitrary external services.
Is there a workaround for CVE-2018-16153?
Before upgrading, temporarily limiting external service authentication may reduce the risk associated with CVE-2018-16153.