Veeam Backup for Microsoft Azure is a comprehensive solution for backing up Azure workloads. However, recent findings have revealed a critical vulnerability, tracked as CVE-2025-23082, which may expose organizations using this service to a risk of Server-Side Request Forgery (SSRF) attacks. In this blog post, we will dive deep into the details of this vulnerability, including code snippets, original reference links, and guidance on how to protect your Veeam Backup for Microsoft Azure installations.

What is SSRF and how does it relate to Veeam Backup for Microsoft Azure?
Server-Side Request Forgery (SSRF) is a type of attack that allows an attacker to force a vulnerable server to make unauthorized requests on behalf of the attacker. This could lead to unauthorized access to internal resources, network enumeration, or facilitation of other attacks.

In the context of Veeam Backup for Microsoft Azure, an unauthenticated attacker could potentially leverage this vulnerability to send unauthorized requests from the Veeam Backup server. This not only compromises the security of the Veeam Backup installation, but may also impact the confidentiality and integrity of the organization's data.

Code Snippet

The following code snippet demonstrates the POST request an attacker might use to exploit the SSRF vulnerability in Veeam Backup for Microsoft Azure:

POST /api/v1/azure/backup/{vbm_guid}
Host: target
Content-Type: application/json

{
    "vm_id": 1,
    "vbm_ip": "victimIP",
    "ssrf_url": "http://malicious.example.com";
}

In this example, the attacker sends a malicious POST request to the Veeam Backup server, specifying a malicious URL http://malicious.example.com in the ssrf_url field. If the request is successful, Veeam Backup might be tricked into sending an unauthorized request to the malicious URL on behalf of the attacker.

Original References

1. CVE-2025-23082 - National Vulnerability Database
2. Veeam Backup for Microsoft Azure - Security Advisory
3. Exploit-DB Entry on CVE-2025-23082

Exploit Details

The potential attack vector for this vulnerability involves an unauthenticated attacker sending POST requests to the Veeam Backup API endpoint, specifically targeting the /api/v1/azure/backup/{vbm_guid} URI. These malicious requests could contain crafted payload data, used to facilitate the SSRF attack.

Mitigation Techniques

1. Apply Patches: Veeam has released an update to address the SSRF vulnerability. Organizations are advised to upgrade their Veeam Backup for Microsoft Azure installations to the latest version as soon as possible.

2. Restrict Network Access: Limit access to the Veeam Backup API endpoints to trusted IP addresses. This can be done by implementing firewall rules or applying Azure Network Security Groups (NSGs) to filter incoming traffic.

3. Monitor Logs: Regularly review Veeam Backup logs for any suspicious activity, such as unauthorized requests, failed logins, or error messages indicative of SSRF attacks.

4. Implement Least Privilege: Ensure that the Veeam Backup service account runs with the least privilege necessary to perform its required functions and has no access to other critical resources within the Azure environment.

Conclusion

CVE-2025-23082 is a critical SSRF vulnerability in Veeam Backup for Microsoft Azure, which may allow an attacker to manipulate the system into sending unauthorized requests. It is crucial for organizations to apply patches, restrict network access, monitor logs, and implement the principle of least privilege in their Veeam Backup installations to minimize the risk of exploitation.

Timeline

Published on: 01/14/2025 02:15:08 UTC
Last modified on: 01/14/2025 16:15:36 UTC