CVE-2025-4029: Personal Diary System Buffer Overflow Flaw

CVE-2025-4029 Overview

CVE-2025-4029 is a stack-based buffer overflow vulnerability in code-projects Personal Diary Management System 1.0. The flaw resides in the addrecord function of the New Record Handler component. Attackers can trigger memory corruption by manipulating the filename argument during record creation.

Exploitation requires local access to the target system. The exploit details have been publicly disclosed, increasing the risk of opportunistic abuse. The vulnerability maps to [CWE-119] (Improper Restriction of Operations within the Bounds of a Memory Buffer) and [CWE-787] (Out-of-bounds Write).

Critical Impact
A local attacker supplying an overly long filename argument to the addrecord function can corrupt stack memory, potentially leading to application crash or arbitrary code execution within the user's security context.

Affected Products

Fabian Personal Diary Management System 1.0
Component: New Record Handler (addrecord function)
CPE: cpe:2.3:a:fabian:personal_diary_management_system:1.0:*:*:*:*:*:*:*

Discovery Timeline

2025-04-28 - CVE-2025-4029 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-4029

Vulnerability Analysis

The vulnerability exists in the addrecord function within the New Record Handler component of Personal Diary Management System 1.0. The function processes a filename argument without enforcing bounds checking against a fixed-size stack buffer. When user-supplied input exceeds the destination buffer size, the write operation overflows into adjacent stack memory.

This class of memory corruption can overwrite the saved return address, stack canaries (if present), and adjacent local variables. The public disclosure of exploit information lowers the barrier for reproducibility. Because the attack vector is local, the attacker must already have execution rights on the host running the diary application.

Root Cause

The root cause is missing input length validation before copying the filename value into a fixed-size stack buffer. The developer relied on unsafe string handling routines that do not enforce destination bounds. This aligns with [CWE-787] out-of-bounds write and [CWE-119] improper memory buffer restriction.

Attack Vector

A local authenticated user invokes the New Record Handler and supplies a crafted filename string longer than the target buffer. The oversized value is copied into stack memory during record creation. The resulting overflow can crash the process or, under specific compiler and OS configurations, redirect execution to attacker-controlled memory.

No verified proof-of-concept code is included here. Refer to the GitHub CVE Documentation for public technical analysis of the overflow condition.

Detection Methods for CVE-2025-4029

Indicators of Compromise

Unexpected termination or crash dumps generated by the Personal Diary Management System process during record creation.
Event log entries showing access violations or stack corruption within the diary application binary.
Presence of unusually long filename values in application logs or user input records.

Detection Strategies

Monitor process crash telemetry for the diary application executable, correlating faults with recent addrecord invocations.
Inspect application input logs for filename arguments exceeding expected length thresholds.
Use endpoint detection tooling to flag anomalous child processes or shellcode-like behavior spawned by the application.

Monitoring Recommendations

Enable Windows Error Reporting or equivalent crash telemetry collection for the affected binary.
Ingest application and OS crash logs into a centralized SIEM for correlation.
Establish a baseline of legitimate filename lengths and alert on outliers.

How to Mitigate CVE-2025-4029

Immediate Actions Required

Restrict local access to systems running Personal Diary Management System 1.0 to trusted users only.
Remove or disable the application on shared or multi-user hosts until a patched release is available.
Enable OS-level exploit mitigations such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR).

Patch Information

No vendor advisory or official patch has been published at the time of writing. Consult the Code Projects Overview and the VulDB entry #306392 for updates. Organizations should treat the application as unmaintained until the vendor issues a fix.

Workarounds

Limit execution of the diary application to isolated, non-privileged user accounts.
Apply application allowlisting to prevent unauthorized users from launching the vulnerable binary.
Consider migrating to an actively maintained diary or note-taking application with a documented security response process.
Enforce input length validation at the operating system or wrapper level where feasible.

bash

# Example: restrict execute permissions on the vulnerable binary (Linux)
chmod 750 /path/to/personal_diary_management_system
chown root:trusted_users /path/to/personal_diary_management_system