Pentest Reims: Preventing an Exposed Backup from Compromising the Information System

A compromise doesn’t always start with a front-end server, a web application, or a user workstation. It can begin with an exposed backup bucket, a snapshot that’s too widely accessible, a poorly segmented NAS share, or a backup repository forgotten in a secondary location. In this type of scenario, the attacker does not directly target the production environment. Instead, they exploit a blind spot that is supposed to ensure resilience. This is precisely why a penetration test must include secondary storage, backups, snapshots, and disaster recovery systems. A thorough penetration test does more than simply identify a poorly protected storage area. It assesses whether this access could lead to a data leak, logical deletion, a jump to other assets, or a broader compromise of the information system. A thorough cybersecurity audit therefore treats backups, secondary storage, and recovery mechanisms as primary attack surfaces.

Why Organizations in Reims Need to Monitor Their Backups and Secondary Storage

Greater Reims highlights several key sectors, including digital technology, healthcare, logistics, and the bioeconomy. In this type of environment, backups, secondary storage, data exports, and disaster recovery plans are not merely technical details of little importance. They are central to resilience and, therefore, also central to cyber risk when they are exposed or poorly managed.

The most frequent weaknesses in this area are often :

• backup storage that is too widely exposed;
• snapshots accessible from overly permissive accounts;
• lack of immutability in critical backups;
• backup accounts that are not properly isolated;
• insufficient restoration tests;
• Incomplete logging of read, delete, or modify operations.

In this context, the backup architecture resembles a wine cellar with a poorly secured false bottom. The main structure appears solid, and the organization believes its assets are secure, but if a secondary compartment remains accessible without sufficient controls, it is precisely the most valuable items that become the most vulnerable.

That is why a penetration test in Reims must assess the security of backups, secondary storage, and recovery paths with the same level of rigor as the production environment itself.

How Does a Penetration Test in Reims Focused on Backups and Secondary Storage Work?

For more information on pentesting: https: //www.hackmosphere.fr/test-intrusion/

A backup-focused penetration test in Reims follows a step-by-step approach. The goal is not to disrupt business continuity, but to determine whether an attacker can read, delete, manipulate, or use secondary storage as a foothold to access other resources.

1. Recognition: Identifying storage locations, interfaces, and traces of exposure

The first phase involves identifying the services, paths, references, and interfaces associated with the storage or backup mechanisms exposed within the authorized scope.

• Nmap (+ NSE scripts): The go-to scan for identifying signature ports (9392 for Veeam, 13720 for Bacula, 1556 for NetBackup, 873 rsync, 2049 NFS…) and run dedicated scripts such as rsync-list-modules, nfs-showmount, and smb-enum-share.
• enum4linux-ng : SMB/NetBIOS enumeration (shares, users, groups) that is very useful for identifying backup shares exposed on Windows/Samba servers.

This step is used to identify storage consoles, access endpoints, historical paths, references to snapshots, backup exports, or restore interfaces.

2. Identifying vulnerabilities (AD focus): distinguishing between vulnerabilities that can actually be exploited

Once the mapping is complete, the penetration test looks for configuration and governance flaws that could have a tangible impact.

• BloodHound: Once AD access has been obtained, this tool can be used to identify service accounts associated with backup solutions (e.g., svc_veeam, svc_backup) and their permissions, which often serve as attack vectors for gaining Domain Admin access (backup accounts frequently have elevated privileges, e.g., DCSync replication rights).
• NetExec ( formerly CrackMapExec): An essential tool in Active Directory environments for enumerating SMB shares, testing credentials, and identifying shares with names such as Backup$ and NAS_Backup.

Typical points of attention include:

• excessive permissions on secondary storage;
• ‘incorrectly configured service accounts’;
• volumes or snapshots that are not properly partitioned;
• backup secrets exposed;
• lack of a clear separation between production and backup;
• Possible deletion or alteration without safeguards.

3. Controlled exploitation: demonstrating impact without compromising resilience

The operational phase must remain strictly controlled. Its purpose is to demonstrate what access to secondary storage actually enables, without compromising availability or operational integrity.

• rclone can be used, within an authorized framework, to illustrate the impact of uncontrolled access to certain storage systems or backups.
• restic is useful for demonstrating the reality of certain scenarios related to backup repositories and their governance.

This phase can, for example, demonstrate :

• reading sensitive backup data;
• the discovery of secrets or strategies useful for a comeback;
• the possibility of logical deletion or alteration;
• access to snapshots of critical environments;
• preparation for a wider IS compromise.

4. Report: Turning a Blind Spot in Resilience into a Business Risk

For a CISO, the value of the report lies in its ability to link a backup vulnerability to a concrete impact: data breach, loss of recovery capability, preparation for a ransomware attack, a breach spreading to production systems, or an overall weakening of resilience.

A thorough IT security audit therefore documents the relevant storage systems, the accounts involved, possible operations, exposed assets, and priority remediation measures.

5. Retest: Verify that the patches actually protect critical storage systems

The retest confirms that backups are better isolated, that dedicated accounts have been hardened, that immutability or equivalent protections are enabled, and that sensitive operations are now logged and restricted.

Real-world attack example: When an exposed backup becomes an entry point

A plausible scenario begins with access to a backup bucket, a snapshot, a backup repository, or secondary storage that is accessible beyond what is actually needed. The attacker first scans whatever they find: data, configurations, credentials, restore artifacts, or traces that help them understand the architecture. If accounts are too permissive or if backup environments are not isolated, this initial scan becomes a foothold for accessing other critical resources.

This type of scenario is particularly dangerous because it targets resilience itself. By compromising backups or their governance, the attacker reduces the organization’s ability to recover from an incident, while increasing its documentary and technical attack surface.

Once the first stage has been completed, impacts can include :

• leak of sensitive data;
• compromise of restoration artifacts;
• preparation for a destructive attack;
• a shift toward more sensitive environments;
• a major setback for the business recovery plan.

That is why a cybersecurity audit in Reims focused on backups and secondary storage offers significant added value: it addresses a common blind spot that can be critical in the event of a crisis.

How to Protect Yourself Against Backup Compromises

Risk reduction relies on a few simple measures, but these require true operational discipline:

• encrypt backups and protect the associated keys;
• segregate accounts and backup environments;
• enable immutability when appropriate;
• strictly restrict read, modify, and delete operations;
• log access and actions on critical storage systems;
• separate production, restoration, and secondary storage;
• regularly test restorations in a controlled environment;
• Periodically reassess the governance of snapshots and exports.

Technical risk reduction chart

Why carry out a pentest with Hackmosphere

A penetration test is only valuable if it simulates a realistic scenario and helps address the actual vulnerabilities that put the organization at risk. This is precisely the approach Hackmosphere takes with its penetration testing services: testing secondary storage, backups, dedicated accounts, and bypass routes that an attacker would seek to exploit in order to weaken an organization’s resilience before launching a more severe attack.

In this type of context, this approach makes it possible to :

• identify the exposures that can actually be utilized in storage facilities;
• test the robustness of the backup accounts and governance;
• measure the business impact of a vulnerability on business continuity;
• prioritize remedies according to the real risk to the business.

For an organization in Reims, this makes it possible to verify whether backups truly support resilience without becoming a backdoor into the information system.

FAQ

Does a penetration test in Reims assess the risks associated with exposed backups, snapshots, or secondary storage?

Yes. A penetration test can demonstrate what an attacker can actually read, modify, delete, or use as a foothold from a poorly protected backup storage system or snapshot.

Why are backups such a sensitive target in cybersecurity?

Because they contain critical data and determine an organization’s ability to recover from an incident. When they are exposed or poorly managed, they become a strategic lever for an attacker.

What is the difference between a standard cybersecurity audit in Reims and a backup-focused penetration test?

A backup-focused penetration test examines buckets, snapshots, backup repositories, dedicated accounts, restore operations, and associated bounce paths. It complements network or web audits by focusing on operational resilience itself.

Conclusion

Backups should not be viewed as merely a technical safety net. As soon as secondary storage, a snapshot, or a backup repository provides access to sensitive data or accounts, it becomes a strategic attack surface. A penetration test When conducted properly, it allows you to identify these scenarios, prioritize remediation efforts, and verify whether your technical resilience can truly withstand an attacker who first targets the very systems that are supposed to help you recover.

Have Your Critical Backups Assessed