CVE-2022-3267 is a Cross-Site Request Forgery (CSRF) vulnerability identified in the GitHub project ikus060/rdiffweb prior to version 2.4.6. rdiffweb is a web-based interface for rdiff-backup, a tool used for incremental backups. The vulnerability arises because the application does not adequately verify the origin of requests that perform state-changing operations, allowing an attacker to trick an authenticated user into submitting unwanted actions via crafted web requests. The CVSS 3.0 base score is 6.8 (medium severity), with the vector AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:L indicating that the attack requires adjacent network access, low attack complexity, no privileges required, but user interaction is necessary. The impact on confidentiality is high, as unauthorized commands could lead to data exposure or leakage. Integrity impact is low, and availability impact is low but present. No known exploits are reported in the wild, and no specific affected versions are detailed beyond being prior to 2.4.6. The vulnerability is categorized under CWE-352, which is a common web security issue where CSRF tokens or other anti-CSRF mechanisms are missing or improperly implemented, enabling attackers to perform unauthorized actions on behalf of authenticated users.

For European organizations using rdiffweb for backup management, this vulnerability could lead to unauthorized disclosure of sensitive backup data or manipulation of backup operations if an attacker successfully tricks an authenticated user into executing malicious requests. Given that backups often contain critical business and personal data, exposure could result in data breaches, regulatory non-compliance (e.g., GDPR violations), and operational disruptions. The medium severity rating reflects that exploitation requires user interaction and network proximity, limiting remote exploitation but still posing a risk in environments where users access rdiffweb interfaces from shared or insecure networks. The confidentiality impact is particularly concerning for organizations handling personal or sensitive data, as unauthorized access to backup data could lead to privacy violations and reputational damage.

To mitigate this vulnerability, organizations should upgrade rdiffweb to version 2.4.6 or later, where the CSRF protections have been implemented or improved. If upgrading is not immediately possible, administrators should implement compensating controls such as enforcing strict network segmentation to limit access to the rdiffweb interface only to trusted hosts and users. Additionally, deploying web application firewalls (WAFs) with rules to detect and block CSRF attack patterns can provide temporary protection. Enabling multi-factor authentication (MFA) for access to the backup interface can reduce the risk of unauthorized actions. It is also advisable to review and implement anti-CSRF tokens or headers in any custom integrations or front-end components interacting with rdiffweb. Regular monitoring of logs for unusual or unauthorized requests targeting the backup interface can help detect attempted exploitation early.