The Open edX Platform is a learning management platform. Instructors can upload csv files containing learner information to create cohorts in the instructor dashboard. These files are uploaded using the django default storage. With certain storage backends, uploads may become publicly available when the uploader uses versions master, palm, olive, nutmeg, maple, lilac, koa, or juniper. The patch in commit cb729a3ced0404736dfa0ae768526c82b608657b ensures that cohorts data uploaded to AWS S3 buckets is written with a private ACL. Beyond patching, deployers should also ensure that existing cohorts uploads have a private ACL, or that other precautions are taken to avoid public access.
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
Access control involves the use of several protection mechanisms such as:
When any mechanism is not applied or otherwise fails, attackers can compromise the security of the product by gaining privileges, reading sensitive information, executing commands, evading detection, etc. There are two distinct behaviors that can introduce access control weaknesses: