usd-2019-0018 | Bitbucket/v5.10.1
Advisory ID: usd-2019-0018
CVE number: N/A
Affected Version: v5.10.1
Vulnerability Type: User Enumeration
First Pubslished: 2019-07-31
Last Update: 2019-05-27
Security Risk: Low
Vendor URL: https://www.atlassian.com/
Vendor Status: Not fixed
Advisory Status: Published
Access control, sometimes called authorization, is how a web application grants access to content and functions to some users and not others. These checks are performed after authentication and govern what ‘authorized’ users are allowed to do. Access control sounds like a simple task. However, this is insidiously difficult to implement correctly. A web application’s access control model is closely tied to the content and functions that the site provides. In addition, the users may fall into a number of groups or roles with different abilities or privileges.
Unprivileged users are able to enumerate valid usernames. Hereto, an user sends a request to „/admin/permissions/users“ with following request
If the username exists, the server responds with an error message that the user has unsufficient rights for this process.
If the username does not exists, the server responds with a message that the user does not exists.
Even if the user doesn’t exists, the server should respond with an error message which points out that the user doesn’t have sufficient rights to execute the process.
- 2019-03-28 Vulnerability securily submitted to email@example.com
- 2019-04-11 Second contact attempt via contact formular
- 2019-05-23 Atlassian Security Team agreed with the publishment of the advisory
This security vulnerabilities were found by Tobias Neitzel and Julian Frey of usd AG.
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