Severity: moderate

Affected versions:

- Apache CouchDB through 3.3.2
- IBM Cloudant before 8413


Design document functions which receive a user http request object may expose 
authorization or session cookie headers of the user who accesses the document.

These design document functions are:
  *    list
  *    show
  *    rewrite
  *    update

An attacker can leak the session component using an HTML-like output, insert 
the session as an external resource (such as an image), or store the credential 
in a _local document with an "update" function.

For the attack to succeed the attacker has to be able to insert the design 
documents into the database, then manipulate a user to access a function from 
that design document.

Workaround: Avoid using design documents from untrusted sources which may 
attempt to access or manipulate request object's headers


Natan Nehorai from the JFrog Vulnerability Research Team (finder)
Or Peles from the JFrog Vulnerability Research Team (reporter)
Richard Ellis from IBM/Cloudant Team (finder)
Mike Rhodes from IBM/Cloudant Team (finder)


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