An issue was discovered in the Security component in Symfony 2.7.x before 2.7.48, 2.8.x before 2.8.41, 3.3.x before 3.3.17, 3.4.x before 3.4.11, and 4.0.x before 4.0.11. A session fixation vulnerability within the Guard login feature may allow an attacker to impersonate a victim towards the web application if the session id value was previously known to the attacker.
Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Symfony | Sensiolabs | 2.7.0 (including) | 2.7.48 (excluding) |
| Symfony | Sensiolabs | 2.8.0 (including) | 2.8.41 (excluding) |
| Symfony | Sensiolabs | 3.3.0 (including) | 3.3.17 (excluding) |
| Symfony | Sensiolabs | 3.4.0 (including) | 3.4.11 (excluding) |
| Symfony | Sensiolabs | 4.0.0 (including) | 4.0.11 (excluding) |
| Symfony | Ubuntu | artful | * |
| Symfony | Ubuntu | bionic | * |
| Symfony | Ubuntu | esm-apps/bionic | * |
| Symfony | Ubuntu | esm-apps/xenial | * |
| Symfony | Ubuntu | upstream | * |
| Symfony | Ubuntu | xenial | * |
Such a scenario is commonly observed when:
In the generic exploit of session fixation vulnerabilities, an attacker creates a new session on a web application and records the associated session identifier. The attacker then causes the victim to associate, and possibly authenticate, against the server using that session identifier, giving the attacker access to the user’s account through the active session.