CVE-2023-23611
First published: Thu Jan 26 2023(Updated: )
### Problem TL;DR: Any LTI tool that is integrated with on the Open edX platform can post a grade back for any LTI XBlock so long as it knows or can guess the block location for that XBlock. In LTI 1.3, LTI tools can "pass back" scores that learners earn while using LTI tools to the edX platform. The edX platform then stores those LTI scores in a separate table. If the right conditions are met, these scores are then persisted to the LMS grades tables. LTI tools can create what are called "line items" on the edX platform. A line item can be thought of as a column in a grade book; it stores results for a specific activity (i.e. XBlock) for a specific set of users (i.e. users in the course using the XBlock). A line item has an optional resource_link_id field, which is basically the XBlock location. An LTI tool can supply any value for this field. An LTI tool submits scores to the edX platform for line items. The code that uploads that score to the LMS grade tables determines which XBlock to upload the grades for by reading the resource_link_id field of the associated line item. Because the LTI tool could have submitted any value for the resource_link_id field, this introduces the potential for a nefarious LTI tool to submit scores for any LTI XBlock on the platform. ### Impact Any LTI tool that is integrated with on the Open edX platform can post a grade back for any LTI XBlock so long as it knows the resource_link_id (i.e. block location) for that XBlock. The impact is a loss of integrity for LTI XBlock grades. ### Patches No available patch ### Workarounds No
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/lti-consumer-xblock | >=7.0.0<7.2.2 | 7.2.2 |
| OpenedX XBlock LTI Consumer | >=7.0.0<7.2.2 |
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Reference Links
- https://github.com/openedx/xblock-lti-consumer/security/advisories/GHSA-7j9p-67mm-5g87
- https://nvd.nist.gov/vuln/detail/CVE-2023-23611
- https://github.com/openedx/xblock-lti-consumer/commit/252f94bd182cd0962af9251015930cb55ec515d7
- https://github.com/pypa/advisory-database/tree/main/vulns/lti-consumer-xblock/PYSEC-2023-21.yaml
- https://github.com/advisories/GHSA-7j9p-67mm-5g87 (Advisory)
Frequently Asked Questions
What is CVE-2023-23611?
CVE-2023-23611 is a vulnerability in the LTI Consumer XBlock that allows unauthorized access to third-party LTI provider tools integrated with Open edX.
What is the severity of CVE-2023-23611?
The severity of CVE-2023-23611 is medium with a CVSS score of 5.4.
How does CVE-2023-23611 affect Open edX?
CVE-2023-23611 affects Open edX versions 7.0.0 and above, prior to 7.2.2, by allowing LTI tools to post unauthorized grades.
How can I fix CVE-2023-23611?
To fix CVE-2023-23611, you should upgrade the Open edX platform to version 7.2.2 or above.
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