CVE-2024-7341 is a session fixation vulnerability identified in the SAML adapters of Keycloak, an open-source identity and access management solution widely used for single sign-on (SSO) and identity federation. The core issue lies in the failure to regenerate the session ID and JSESSIONID cookie upon user login, even when the 'turnOffChangeSessionIdOnLogin' option is configured to enforce this behavior. Session fixation attacks exploit this by allowing an attacker to set or hijack a valid session identifier before the victim authenticates. When the victim logs in, the attacker-controlled session remains valid, enabling the attacker to impersonate the victim with full access rights. The vulnerability affects multiple Keycloak versions, including 0, 23.0.0, and 25.0.0, indicating a persistent flaw across releases. The CVSS 3.1 base score of 7.1 reflects a high severity due to the network attack vector, low complexity, low privileges required before authentication, and the need for user interaction (the victim must log in). The impact includes full compromise of confidentiality, integrity, and availability of the victim's session and associated resources. Although no known exploits are reported in the wild, the vulnerability poses a significant risk given Keycloak's widespread use in enterprise environments for federated authentication. The flaw is particularly critical in environments where session fixation protections are expected to be enforced by configuration but are not effective due to this bug. This undermines trust in session management and can facilitate unauthorized access, data breaches, and lateral movement within networks.

For European organizations, the impact of CVE-2024-7341 can be substantial, especially for those relying on Keycloak for identity federation and SSO in critical sectors such as finance, healthcare, government, and telecommunications. Successful exploitation allows attackers to hijack authenticated sessions, potentially gaining unauthorized access to sensitive data, internal applications, and services. This can lead to data breaches, regulatory non-compliance (e.g., GDPR violations), financial losses, and reputational damage. The vulnerability's ability to compromise confidentiality, integrity, and availability means attackers could manipulate or disrupt services, exfiltrate data, or impersonate users to escalate privileges. Given the high adoption of Keycloak in European enterprises and public sector organizations, the threat surface is significant. Moreover, the requirement for user interaction (victim login) means phishing or social engineering could be leveraged to facilitate exploitation. The absence of known exploits in the wild currently provides a window for mitigation, but the risk remains high due to the ease of exploitation once the attacker controls a session pre-authentication.

1. Monitor Keycloak vendor advisories closely and apply patches or updates as soon as they become available to address CVE-2024-7341. 2. Until patches are released, implement compensating controls such as enforcing strict session management policies, including manual session ID regeneration upon login via custom extensions or reverse proxies. 3. Employ multi-factor authentication (MFA) to reduce the risk of session hijacking leading to full account compromise. 4. Enhance monitoring and logging of session creation, usage, and anomalies to detect potential session fixation attempts early. 5. Educate users about phishing and social engineering risks to minimize the chance of attackers obtaining pre-authentication sessions. 6. Consider network segmentation and zero-trust principles to limit the impact of compromised sessions. 7. Review and harden SAML configurations and session timeout settings to reduce session lifetime and exposure. 8. Conduct regular security assessments and penetration tests focusing on authentication flows and session management.