A buffer overflow vulnerability in aSc TimeTables 2020.11.4 allows an attacker to crash the application, leading to a denial of service.

This is a classic buffer overflow (CWE-120) occurring when the application fails to validate the size of user-supplied input in the Subject title field. An attacker can trigger this condition by providing a 1000-character buffer, resulting in an application crash.

The exploitation of this vulnerability results in a denial of service, which disrupts the availability of the scheduling software. While the CVSS score of 7.5 indicates a high severity, the impact is primarily limited to application instability and service interruption rather than unauthorized data access. Such disruptions can cause significant operational delays for organizations relying on the software for critical logistical planning.

Immediate Action: Users should update to the latest available version of aSc TimeTables, as the vendor has addressed this flaw in subsequent releases.

Proactive Monitoring: Security teams should monitor system event logs for repeated application crashes or unexpected service termination events associated with the aSc TimeTables executable.

Compensating Controls: Ensure that access to the application is restricted to authorized personnel, as the attack vector requires local access or direct interaction with the software interface.

Public Exploit Available: Yes, a proof of concept is available via the Exploit Database (EDB-ID 48133).

The presence of a publicly available proof of concept elevates the risk of this denial of service vulnerability. Administrators are urged to verify their current version of aSc TimeTables and apply the latest security updates provided by aSc Applied Software Consultants to prevent intentional or accidental service disruption.