The web server must generate a session ID using as much of the character set as possible to reduce the risk of brute force.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-206402 | SRG-APP-000224-WSR-000138 | SV-206402r1043181_rule | CCI-001188 | medium |
| Description | ||||
| Generating a session identifier (ID) that is not easily guessed through brute force is essential to deter several types of session attacks. By knowing the session ID, an attacker can hijack a user session that has already been user-authenticated by the hosted application. The attacker does not need to guess user identifiers and passwords or have a secure token since the user session has already been authenticated. By generating session IDs that contain as much of the character set as possible, i.e., A-Z, a-z, and 0-9, the session ID becomes exponentially harder to guess. | ||||
| STIG | Date | |||
| Web Server Security Requirements Guide | 2025-02-12 | |||
Details
Check Text (C-206402r1043181_chk)
Review the web server documentation and deployed configuration to determine what characters are used in generating session IDs.
If the web server is not configured to use at least A-Z, a-z, and 0-9 to generate session identifiers, this is a finding.
Fix Text (F-6663r377799_fix)
Configure the web server to use at least A-Z, a-z, and 0-9 to generate session IDs.