CVE-2025-4889: Tourism Management System Buffer Overflow

CVE-2025-4889 Overview

CVE-2025-4889 is a buffer overflow vulnerability in code-projects Tourism Management System 1.0. The flaw resides in the AddUser function of the User Registration component. Attackers manipulate the username and password arguments to overflow fixed-size buffers, corrupting adjacent memory. Exploitation requires local access with low privileges and no user interaction. Public disclosure of the exploit technique has occurred, increasing risk for deployed instances.

Critical Impact
A locally authenticated attacker can trigger a buffer overflow through crafted registration input, potentially causing memory corruption, application crash, or limited code execution in the Tourism Management System process.

Affected Products

Fabian Tourism Management System 1.0
code-projects Tourism Management System (User Registration component)
Deployments running the AddUser function without input length validation

Discovery Timeline

2025-05-18 - CVE-2025-4889 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-4889

Vulnerability Analysis

The vulnerability is a classic stack or heap buffer overflow classified under [CWE-119] Improper Restriction of Operations within the Bounds of a Memory Buffer and [CWE-120] Buffer Copy without Checking Size of Input. The AddUser function accepts username and password arguments during user registration. The function copies these values into fixed-size buffers without verifying input length against buffer capacity.

Supplying strings longer than the destination buffer overwrites adjacent memory. Depending on compiler protections and memory layout, this corruption can crash the process or alter execution flow. The Tourism Management System is a C or C++ application distributed as a small-scale project, which typically lacks hardening features such as stack canaries or address space layout randomization.

The attack requires local access to the host running the application. Confidentiality, integrity, and availability impact are each rated low, reflecting limited scope beyond the vulnerable process. See the GitHub CVE Analysis for reproduction details.

Root Cause

The root cause is missing bounds checking in the AddUser routine. The function uses unsafe string handling operations, such as strcpy or gets-style copies, that write user-controlled data into fixed-size buffers without length validation.

Attack Vector

A local attacker with permission to invoke the registration workflow submits an overlong username or password value. The overflow corrupts stack or heap memory adjacent to the buffer, resulting in process termination or manipulation of control data. Network exploitation is not possible because the attack vector is local.

// No verified proof-of-concept code is published for CVE-2025-4889.
// Technical reproduction details are available in the referenced
// GitHub CVE Analysis and VulDB entries.

Detection Methods for CVE-2025-4889

Indicators of Compromise

Unexpected crashes or segmentation faults in the Tourism Management System process during user registration operations
Core dumps referencing the AddUser function or corrupted return addresses
Application log entries showing abnormally long username or password field submissions

Detection Strategies

Monitor process exit codes and crash telemetry for the Tourism Management System binary
Inspect registration form submissions for input strings exceeding expected length thresholds
Enable operating system exploit protection logging to capture stack corruption events

Monitoring Recommendations

Log all registration attempts with request payload sizes for offline analysis
Alert on repeated crashes within short time windows on hosts running the application
Correlate local user session activity with application faults to identify probing behavior

How to Mitigate CVE-2025-4889

Immediate Actions Required

Restrict local access to systems hosting Tourism Management System 1.0 to trusted administrators only
Disable the user registration workflow until input validation is enforced
Review application logs for prior exploitation attempts against the AddUser function

Patch Information

No vendor patch is currently listed in the referenced advisories. Consult the VulDB entry and code-projects resource for updates. Organizations should treat this software as unmaintained until a fixed release is confirmed.

Workarounds

Apply input length validation at a reverse proxy or web application firewall in front of the application
Rebuild the source with stack canaries, ASLR, and safe string functions such as strncpy_s if source access is available
Migrate to a maintained tourism management platform that receives regular security updates

bash

# Example: enforce maximum field length at an nginx reverse proxy
# limit request body size and reject overlong form fields
client_max_body_size 8k;
client_body_buffer_size 8k;