CVE-2018-25294: CEWE Photoshow DoS Vulnerability

CVE-2018-25294 Overview

CVE-2018-25294 is a buffer overflow vulnerability affecting CEWE Photoshow version 6.3.4. The vulnerability exists in the login dialog component and allows attackers to crash the application by submitting oversized input data. Specifically, attackers can inject approximately 4000 bytes of data into the email address and password fields to trigger a denial of service condition.

Critical Impact

Attackers can remotely crash CEWE Photoshow 6.3.4 through the login dialog by exploiting the buffer overflow with oversized input, causing service disruption.

Affected Products

• CEWE Photoshow 6.3.4

Discovery Timeline

• 2026-04-26 - CVE-2018-25294 published to NVD
• 2026-04-27 - Last updated in NVD database

Technical Details for CVE-2018-25294

Vulnerability Analysis

This vulnerability (CWE-120: Buffer Copy without Checking Size of Input) occurs due to improper bounds checking in the login dialog of CEWE Photoshow 6.3.4. The application fails to properly validate the length of user-supplied input in the email address and password fields before copying it to a fixed-size buffer.

When a user submits login credentials, the application allocates a buffer with a predetermined size to store the input data. However, if an attacker provides input exceeding this buffer capacity—approximately 4000 bytes—the excess data overwrites adjacent memory locations, leading to memory corruption and ultimately causing the application to crash.

Root Cause

The root cause of CVE-2018-25294 is the absence of proper input length validation in the login dialog's input handling routines. The application uses an unsafe buffer copy operation that does not verify that the source data fits within the destination buffer's boundaries. This classic buffer overflow condition (CWE-120) allows attackers to corrupt memory by providing input that exceeds the expected maximum length for email and password fields.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no authentication or user interaction. An attacker can exploit this vulnerability by:

1. Accessing the CEWE Photoshow login dialog
2. Entering approximately 4000 bytes of arbitrary data into the email address field
3. Entering a similar amount of data into the password field
4. Submitting the login form

The buffer overflow is triggered when the oversized input is processed, causing the application to crash. This results in a denial of service condition where legitimate users cannot access the application. For technical details and proof-of-concept information, refer to Exploit-DB #45211.

Detection Methods for CVE-2018-25294

Indicators of Compromise

• Application crashes occurring specifically during login attempts
• Abnormally large HTTP POST requests to the login endpoint containing oversized email or password parameters
• Memory access violation errors or segmentation faults logged by the application

Detection Strategies

• Monitor for HTTP requests to the login endpoint containing unusually large payload sizes (exceeding 4000 bytes)
• Implement application crash monitoring to detect repeated denial of service attempts
• Deploy network-based intrusion detection rules to flag oversized input submissions to CEWE Photoshow login forms

Monitoring Recommendations

• Enable verbose application logging to capture input validation failures and memory errors
• Set up alerting for multiple consecutive application crashes within a short timeframe
• Monitor network traffic for patterns consistent with buffer overflow exploitation attempts

How to Mitigate CVE-2018-25294

Immediate Actions Required

• Upgrade CEWE Photoshow to a version newer than 6.3.4 if available
• Implement network-level input validation to block oversized requests before they reach the application
• Consider restricting access to the login interface to trusted networks or users until patching is complete

Patch Information

Users should check the CEWE Creator Software Download page for updated versions of the software that address this vulnerability. Additional information can be found at the CEWE PhotoWorld Homepage and the VulnCheck Advisory.

Workarounds

• Implement a web application firewall (WAF) rule to limit the maximum size of input in login form fields
• Restrict network access to the CEWE Photoshow application to trusted IP addresses only
• Consider deploying the application behind a reverse proxy that enforces input length restrictions