CVE-2025-4062: Theater Seat Booking Buffer Overflow Flaw

CVE-2025-4062 is a stack-based buffer overflow in Fabian Theater Seat Booking System affecting the cancel function. Attackers can exploit this critical flaw locally through the cancelcustomername parameter. This article covers technical details, affected versions, impact assessment, and mitigation strategies.

CVE-2025-4062 Overview

CVE-2025-4062 is a stack-based buffer overflow in code-projects Theater Seat Booking System 1.0. The flaw resides in the cancel function, where the cancelcustomername argument is copied into a fixed-size stack buffer without proper bounds checking. An authenticated local attacker can supply an overlong input to corrupt adjacent stack memory. The proof-of-concept has been publicly disclosed, increasing the likelihood of opportunistic exploitation against vulnerable deployments.

Critical Impact
Successful exploitation can crash the application and, depending on runtime protections, enable local code execution in the context of the process handling the cancellation workflow.

Affected Products

Fabian Theater Seat Booking System 1.0
Component: fabian:theater_seat_booking_system
CPE: cpe:2.3:a:fabian:theater_seat_booking_system:1.0

Discovery Timeline

2025-04-29 - CVE-2025-4062 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-4062

Vulnerability Analysis

The vulnerability is a classic stack-based buffer overflow classified under [CWE-119] (Improper Restriction of Operations within the Bounds of a Memory Buffer) and [CWE-787] (Out-of-Bounds Write). The cancel function receives user-controlled input via the cancelcustomername parameter. That input is written into a fixed-size stack buffer without length validation. When the input exceeds the destination buffer size, adjacent stack memory including saved registers and the return address is overwritten.

Exploitation requires local access and low privileges. The attack vector is local rather than network-based, which limits large-scale remote exploitation. However, in shared or kiosk-style deployments common to booking systems, local exploitation remains a realistic threat scenario.

Root Cause

The root cause is the use of an unsafe string-copy operation against a stack-allocated buffer of fixed length. The cancel function trusts the caller-supplied cancelcustomername value and performs no length check before the copy. Modern mitigations such as stack canaries, ASLR, and non-executable stacks reduce reliability of code execution but do not eliminate the crash or corruption primitive.

Attack Vector

An attacker with local access and a valid low-privileged account interacts with the cancellation workflow and submits a cancelcustomername value that exceeds the buffer boundary. The overflow corrupts stack state and can hijack control flow when compiler and OS mitigations are absent or bypassable. Full technical details and the disclosed proof-of-concept are documented in the GitHub CVE PoC writeup and the VulDB entry #306499.

Detection Methods for CVE-2025-4062

Indicators of Compromise

Unexpected crashes or segmentation faults in the Theater Seat Booking System process, particularly during cancellation operations.
Core dumps or Windows Error Reporting entries referencing the cancel function or corrupted return addresses.
Cancellation records containing abnormally long cancelcustomername values or non-printable byte sequences.

Detection Strategies

Instrument the application binary with AddressSanitizer or a similar runtime memory checker in test environments to catch overflows during fuzzing.
Enable operating system exploit protection (DEP, ASLR, CFG) and log any exceptions raised when the application terminates unexpectedly.
Review application-layer logs and database entries for cancelcustomername inputs that exceed reasonable name lengths.

Monitoring Recommendations

Monitor process telemetry on hosts running the booking software for repeated crashes or child process spawning from the application context.
Alert on new binaries written to directories associated with the booking system after cancellation activity.
Track local logon events on hosts running the application, since exploitation requires local, authenticated access.

How to Mitigate CVE-2025-4062

Immediate Actions Required

Restrict local access to systems running Theater Seat Booking System 1.0 to trusted operators only.
Remove or disable the application on internet-facing or multi-user hosts until a patched version is available.
Apply operating system exploit mitigations (DEP, ASLR, stack protection) and confirm they are active for the application process.

Patch Information

No vendor patch or fixed version is listed in the NVD entry or the referenced VulDB advisory at the time of writing. Consult the code-projects resource hub for updates. If maintaining the software in-house, replace unsafe copy operations in the cancel function with bounded alternatives such as strncpy_s or snprintf, and validate cancelcustomername length before use.

Workarounds

Enforce input length limits at any upstream component (web form, reverse proxy, or wrapper script) that feeds data into the cancel function.
Run the application under a low-privileged service account to reduce the impact of successful exploitation.
Isolate hosts running the vulnerable software using host firewalls and application allowlisting to prevent secondary payload execution.

bash

# Example: restrict interactive access to the booking host (Linux)
sudo usermod -s /sbin/nologin booking_kiosk_user
sudo chmod 750 /opt/theater_seat_booking