CVE-2024-2331: Tourist Reservation Buffer Overflow Flaw

CVE-2024-2331 Overview

A critical buffer overflow vulnerability has been identified in SourceCodester Tourist Reservation System version 1.0. This vulnerability exists within the ad_writedata function located in the System.cpp file. The flaw allows remote attackers to exploit improper handling of the ad_code argument, leading to a classic buffer overflow condition. The exploit has been publicly disclosed and may be actively used by threat actors.

Critical Impact

This buffer overflow vulnerability allows remote attackers to potentially execute arbitrary code, crash the application, or gain unauthorized access to the underlying system without requiring authentication or user interaction.

Affected Products

• SourceCodester Tourist Reservation System 1.0
• Razormist Tourist Reservation System 1.0

Discovery Timeline

• 2024-03-09 - CVE-2024-2331 published to NVD
• 2025-02-26 - Last updated in NVD database

Technical Details for CVE-2024-2331

Vulnerability Analysis

This vulnerability is classified as CWE-120 (Buffer Copy without Checking Size of Input), commonly known as a classic buffer overflow. The vulnerable ad_writedata function in System.cpp fails to properly validate the size of input data provided through the ad_code argument before copying it into a fixed-size buffer. This oversight allows attackers to submit data that exceeds the allocated buffer space, overwriting adjacent memory regions.

Buffer overflow vulnerabilities of this nature can lead to multiple security consequences including denial of service through application crashes, information disclosure via memory leaks, and in severe cases, arbitrary code execution when attackers can control the instruction pointer or overwrite critical program data structures.

Root Cause

The root cause of this vulnerability lies in the improper bounds checking within the ad_writedata function. When processing the ad_code parameter, the function copies user-supplied data into a buffer without verifying that the input length does not exceed the buffer's allocated size. This is a fundamental secure coding violation where untrusted input is handled without proper validation.

The use of unsafe string handling functions or direct memory operations without size constraints enables attackers to provide oversized input that corrupts the stack or heap, depending on the buffer's memory allocation type.

Attack Vector

The vulnerability is exploitable remotely over the network. An attacker can craft a malicious request containing an oversized ad_code value and send it to the vulnerable Tourist Reservation System application. Since the attack requires no authentication and no user interaction, it presents a significant risk to any publicly accessible deployment of this software.

The exploitation mechanism involves sending specially crafted input that overflows the destination buffer. A successful attack could allow the attacker to:

1. Overwrite adjacent stack variables to alter program flow
2. Corrupt return addresses to redirect execution to attacker-controlled code
3. Crash the application causing denial of service
4. Potentially achieve remote code execution depending on system protections

For detailed technical analysis and proof-of-concept information, refer to the GitHub Buffer Overflow Report.

Detection Methods for CVE-2024-2331

Indicators of Compromise

• Unexpected application crashes or segmentation faults in the Tourist Reservation System
• Anomalously large values in the ad_code parameter within application logs
• Memory corruption indicators or core dumps from the System.cpp module
• Unusual network traffic patterns targeting the reservation system endpoints

Detection Strategies

• Monitor application logs for malformed or oversized input in the ad_code field
• Implement intrusion detection rules to flag requests with abnormally long parameter values
• Deploy memory protection monitoring to detect buffer overflow attempts
• Use application-level WAF rules to enforce input length restrictions

Monitoring Recommendations

• Enable verbose logging for the Tourist Reservation System to capture input parameters
• Configure SIEM alerts for repeated application crashes or memory-related errors
• Monitor network traffic for patterns consistent with exploitation attempts
• Implement runtime application self-protection (RASP) to detect memory corruption

How to Mitigate CVE-2024-2331

Immediate Actions Required

• Restrict network access to the Tourist Reservation System to trusted IP ranges only
• Implement input validation at the network perimeter to limit parameter sizes
• Consider temporarily disabling the affected functionality until a patch is available
• Deploy web application firewall rules to filter oversized ad_code parameters

Patch Information

As of the last update, no official vendor patch has been released for this vulnerability. Organizations using SourceCodester Tourist Reservation System 1.0 should monitor the vendor's communication channels for security updates. Given this is an open-source project, users may need to implement source code modifications themselves or seek community-provided fixes.

For additional vulnerability details, refer to VulDB #256282.

Workarounds

• Implement strict input validation to enforce maximum length constraints on the ad_code parameter
• Deploy the application behind a reverse proxy with request filtering capabilities
• Compile the application with stack canaries and ASLR enabled if rebuilding from source
• Isolate the application in a containerized environment to limit the impact of successful exploitation

If modifying the source code is feasible, consider implementing bounds checking in the ad_writedata function. Ensure all input handling uses safe functions that explicitly limit copy operations to the destination buffer size.