Bitbucket Server Improper Access Control Scanner

Bitbucket Server is a popular web-based collaboration tool used for managing source code repositories. It is widely utilized in software development environments by developers and enterprises to facilitate code collaboration and version control. Bitbucket Server provides repository management and integrates with various development tools, creating an efficient workflow for teams. It allows for code review, pull requests, and branch management, ultimately ensuring high-quality code deployment. The platform is utilized across diverse industries, including technology, finance, and healthcare, making it a crucial tool in managing software projects.

The identified vulnerability in Bitbucket Server involves insecure authorization, allowing bypass via permission misconfiguration. This issue arises when access controls fail to adequately restrict unauthorized access to sensitive information. Insecure authorization can lead to unauthorized users gaining access to privileged resources. This vulnerability could potentially expose sensitive data, facilitate unauthorized modifications, and cause significant security breaches. It is crucial to address these issues promptly to maintain data confidentiality and integrity, protecting organizational assets and user data.

The detailed technical aspect of the vulnerability includes a permission bypass through URL encoding (%20). The vulnerability is triggered by accessing improperly configured endpoints, allowing unauthorized users to bypass authentication mechanisms. This typically occurs when a user inputs a URL with a space encoded as %20, avoiding the normal authentication process. The vulnerable endpoint includes paths such as "{{BaseURL}}/admin%20/db" with expected content like "

Database

" and "Migrate database". The vulnerability can be exploited by crafting specific requests that mimic authorized access, reading or manipulating data without proper authorization.

Exploitation of this vulnerability can lead to unauthorized access to sensitive database information. Malicious actors might gain access to system configurations, user credentials, or other critical data stored within the application. This unauthorized access can result in data leakage, corruption, or manipulation detrimental to business operations. Additionally, it could potentially facilitate further attacks, such as privilege escalation or system takeover, magnifying the security risks faced by the affected organization.

REFERENCES

• https://github.com/Threekiii/Awesome-POC/blob/master/Web%E5%BA%94%E7%94%A8%E6%BC%8F%E6%B4%9E/Atlassian%20Bitbucket%20%E7%99%BB%E5%BD%95%E7%BB%95%E8%BF%87%E6%BC%8F%E6%B4%9E.md