CWE-530: Exposure of Backup File to an Unauthorized Control Sphere
A backup file is stored in a directory or archive that is made accessible to unauthorized actors.
How it's found
Exposure of Backup File to an Unauthorized Control Sphere is a specific, narrowly defined instance of a broader pattern. Testers confirm it with targeted code review and a proof-of-concept input that exercises the exact code path this weakness describes.
Often, older backup files are renamed with an extension such as .~bk to distinguish them from production files. The source code for old files that have been renamed in this manner and left in the webroot can often be retrieved. This renaming may have been performed automatically by the web server, or manually by the administrator.
Consequences
- Read Application Data: At a minimum, an attacker who retrieves this file would have all the information contained in it, whether that be database calls, the format of parameters accepted by the application, or simply information regarding the architectural structure of your site.
Mitigations
- Policy: Recommendations include implementing a security policy within your organization that prohibits backing up web application source code in the webroot.
Where this fits in a TurboPentest engagement
TurboPentest's agentic pentest is powerful and covers a broad range of issues automatically. This particular class is best confirmed in a manual IntegSec engagement, where human pentesters apply deeper methodology and a larger context window than any automated pass.
Frequently asked questions
What is CWE-530?
A backup file is stored in a directory or archive that is made accessible to unauthorized actors.
How do you find Exposure of Backup File to an Unauthorized Control Sphere?
Exposure of Backup File to an Unauthorized Control Sphere is a specific, narrowly defined instance of a broader pattern. Testers confirm it with targeted code review and a proof-of-concept input that exercises the exact code path this weakness describes.
What is the impact of CWE-530?
Read Application Data: At a minimum, an attacker who retrieves this file would have all the information contained in it, whether that be database calls, the format of parameters accepted by the application, or simply information regarding the architectural structure of your site.
Does TurboPentest test for Exposure of Backup File to an Unauthorized Control Sphere?
TurboPentest's agentic pentest is powerful and covers a broad range of issues automatically. This particular class is best confirmed in a manual IntegSec engagement, where human pentesters apply deeper methodology and a larger context window than any automated pass.
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