CVE-2022-3295 is a medium severity vulnerability classified under CWE-770, which refers to the allocation of resources without proper limits or throttling. This vulnerability affects the GitHub project ikus060/rdiffweb, a web-based interface for the rdiff backup tool, prior to version 2.4.8. The core issue lies in the software's failure to impose restrictions on resource consumption during certain operations, potentially allowing an attacker to trigger excessive resource allocation. This can lead to denial of service (DoS) conditions by exhausting system resources such as memory or CPU, thereby impacting the availability of the application or the underlying system. The CVSS 3.0 base score is 5.3, indicating a medium severity level. The vector string (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L) shows that the vulnerability is remotely exploitable over the network without requiring authentication or user interaction, but it only impacts availability and not confidentiality or integrity. No known exploits are reported in the wild, and no specific affected versions are detailed beyond being prior to 2.4.8. The lack of patch links suggests that users should upgrade to version 2.4.8 or later where the issue is presumably fixed. Since rdiffweb is used for managing backups via a web interface, this vulnerability could be triggered by sending crafted requests that cause the server to allocate excessive resources without limits, resulting in service disruption.

For European organizations, especially those relying on rdiffweb for backup management and data protection, this vulnerability poses a risk of service disruption. An attacker could remotely induce a denial of service, potentially interrupting backup operations or access to backup data through the web interface. This could delay recovery efforts in case of data loss or system failure, impacting business continuity. Organizations in sectors with strict data availability requirements, such as finance, healthcare, and critical infrastructure, may face operational and compliance challenges if backups become inaccessible. Although the vulnerability does not compromise data confidentiality or integrity, the availability impact alone can have significant consequences. The fact that no authentication is required to exploit this vulnerability increases the attack surface, making it easier for external threat actors to target exposed rdiffweb instances. Given that rdiffweb is an open-source tool, it may be used by small and medium enterprises or internal IT teams across Europe, which might not have extensive security monitoring, increasing the risk of unnoticed exploitation attempts.

European organizations using ikus060/rdiffweb should immediately upgrade to version 2.4.8 or later where this vulnerability is addressed. If upgrading is not immediately possible, administrators should restrict network access to the rdiffweb interface using firewalls or VPNs to limit exposure to trusted users only. Implementing rate limiting or web application firewall (WAF) rules to detect and block abnormal request patterns that could trigger excessive resource allocation is recommended. Monitoring system resource usage and setting alerts for unusual spikes can help detect exploitation attempts early. Additionally, organizations should review their backup and recovery procedures to ensure they can maintain business continuity in case of service disruption. Regularly auditing and updating all backup-related software and dependencies will reduce the risk of similar vulnerabilities. Finally, documenting and enforcing strict access controls and network segmentation for backup management interfaces will further reduce the attack surface.