CVE-2022-3250 is a medium-severity vulnerability identified in the ikus060/rdiffweb project, a web-based interface for the rdiff backup tool. The issue pertains to the handling of sensitive cookies during HTTPS sessions where the 'Secure' attribute is not set. The 'Secure' attribute in cookies instructs browsers to only send the cookie over secure HTTPS connections, preventing transmission over unencrypted HTTP channels. Without this attribute, sensitive cookies may be exposed to interception via man-in-the-middle attacks or network sniffing if the session is downgraded or if mixed content is present. This vulnerability is classified under CWE-614, which relates to sensitive cookies being transmitted without the 'Secure' flag, thereby compromising confidentiality and integrity of session data. The CVSS v3.0 score is 4.9 (medium), reflecting that the attack vector is adjacent network (AV:A), requires low attack complexity (AC:L), privileges (PR:L), and user interaction (UI:R). The impact affects confidentiality, integrity, and availability to a limited extent. The vulnerability affects versions prior to 2.4.6, though specific affected versions are unspecified. No known exploits are currently reported in the wild, and no official patches are linked, but the issue is publicly documented since September 2022.

For European organizations using ikus060/rdiffweb, this vulnerability could lead to partial compromise of session cookies if attackers can intercept network traffic, particularly in environments where HTTPS enforcement is inconsistent or where internal network security is weak. This could allow attackers to hijack user sessions, potentially gaining unauthorized access to backup management interfaces or sensitive data. Given that rdiffweb is used for backup management, unauthorized access could lead to data exposure, manipulation, or disruption of backup operations, impacting data integrity and availability. The risk is heightened in organizations with remote or hybrid work setups where network security controls may vary. However, the requirement for adjacent network access and user interaction limits the attack surface. The absence of known exploits reduces immediate risk but does not eliminate potential future exploitation. Organizations relying on rdiffweb for critical backup management should consider this vulnerability seriously to maintain operational security and data protection compliance under European regulations such as GDPR.

To mitigate this vulnerability, European organizations should: 1) Upgrade to version 2.4.6 or later of ikus060/rdiffweb where the issue is presumably fixed. 2) If upgrading is not immediately possible, implement web server or reverse proxy configurations to enforce the 'Secure' attribute on cookies set by rdiffweb, for example by using HTTP response header modifications (e.g., 'Set-Cookie' directives with 'Secure' flag). 3) Ensure strict HTTPS enforcement across all access points to rdiffweb, including redirecting all HTTP traffic to HTTPS and disabling mixed content. 4) Employ network segmentation and monitoring to limit adjacent network access to backup management interfaces. 5) Educate users about phishing and social engineering risks since user interaction is required for exploitation. 6) Regularly audit and monitor session management and access logs for suspicious activity. 7) Consider implementing additional authentication controls such as multi-factor authentication to reduce risk from session hijacking.