Title

The web server must invalidate session identifiers upon hosted application user logout or other session termination. (Cat II impact)

Discussion

Captured sessions can be reused in "replay" attacks. This requirement limits the ability of adversaries from capturing and continuing to employ previously valid session IDs. Session IDs are tokens generated by web applications to uniquely identify an application user's session. Unique session IDs help to reduce predictability of said identifiers. When a user logs out, or when any other session termination event occurs, the web server must terminate the user session to minimize the potential for an attacker to hijack that particular user session.

Check Content

Review the web server documentation and deployed configuration to verify that the web server is configured to invalidate session identifiers when a session is terminated. If the web server does not invalidate session identifiers when a session is terminated, this is a finding.

Fix Text

Configure the web server to invalidate session identifiers when a session is terminated.

Additional Identifiers

Rule ID: SV-206396r961113_rule

Vulnerability ID: V-206396

Group Title: SRG-APP-000220

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.