CVE-2018-25303: Buffer Overflow Vulnerability Detected

CVE-2018-25303 Overview

CVE-2018-25303 is a stack-based buffer overflow vulnerability affecting Allok Video to DVD Burner version 2.6.1217. The vulnerability exists in the License Name field of the application's registration interface, allowing local attackers to execute arbitrary code by exploiting a structured exception handler (SEH) overwrite condition.

Critical Impact

Local attackers can achieve arbitrary code execution by crafting malicious input that overwrites the SEH chain, potentially leading to complete system compromise.

Affected Products

• Allok Video to DVD Burner version 2.6.1217

Discovery Timeline

• 2026-04-29 - CVE-2018-25303 published to NVD
• 2026-04-29 - Last updated in NVD database

Technical Details for CVE-2018-25303

Vulnerability Analysis

This vulnerability is classified as CWE-121 (Stack-based Buffer Overflow). The flaw resides in the registration mechanism of Allok Video to DVD Burner, specifically in how the application processes user-supplied data in the License Name input field during the software registration process.

The application fails to properly validate the length of input provided to the License Name field before copying it to a fixed-size stack buffer. When an attacker supplies input exceeding the buffer's allocated space, the overflow corrupts adjacent stack memory, including the structured exception handler chain.

The local attack vector means that exploitation requires the attacker to have local access to the system or to convince a user to paste malicious content into the registration field. The exploitation does not require any special privileges or user interaction beyond the initial input.

Root Cause

The root cause is improper input validation in the License Name field processing routine. The application allocates a fixed-size buffer on the stack to store the license name string but does not enforce length restrictions on user input before the copy operation. This allows an attacker to write beyond the buffer boundaries, corrupting the SEH chain and gaining control of program execution flow.

Attack Vector

The attack is executed locally by crafting a specially formatted input string for the License Name field. The exploitation technique involves:

1. Creating a payload consisting of approximately 780 bytes of padding data to reach the SEH chain location on the stack
2. Appending carefully crafted pointers to overwrite the SEH handler address
3. Including shellcode that will execute when the exception handler is triggered

The attacker can deliver this payload by copying the malicious string and pasting it directly into the License Name input field during the registration process. When the application processes this oversized input, it triggers a buffer overflow that overwrites the SEH chain, redirecting execution to attacker-controlled shellcode.

The exploitation leverages the SEH overwrite technique, which is a classic Windows exploitation method. When an exception occurs, Windows walks the SEH chain to find an appropriate handler. By overwriting the handler pointer with a controlled address, the attacker can redirect execution to their shellcode.

Detection Methods for CVE-2018-25303

Indicators of Compromise

• Presence of Allok Video to DVD Burner version 2.6.1217 installed on systems
• Unusual process behavior or crashes associated with the Allok Video to DVD Burner application
• Evidence of attempted registration with abnormally long license name strings in application logs
• Memory access violations or exception handling anomalies in the application process

Detection Strategies

• Monitor for process crashes or exceptions in Video to DVD Burner.exe or related executables
• Implement endpoint detection rules to identify SEH overwrite exploitation patterns
• Deploy application control policies to restrict or monitor legacy software installations
• Use memory protection tools to detect stack buffer overflow attempts

Monitoring Recommendations

• Enable Windows Application Event logging to capture application crashes and exceptions
• Configure endpoint protection solutions to alert on exploitation techniques targeting SEH mechanisms
• Maintain an inventory of installed software versions to identify vulnerable Allok Video to DVD Burner installations
• Monitor for suspicious process creation events following application execution

How to Mitigate CVE-2018-25303

Immediate Actions Required

• Remove or uninstall Allok Video to DVD Burner version 2.6.1217 from all systems
• If the application is business-critical, isolate affected systems from sensitive network segments
• Consider alternative DVD burning software with active security maintenance
• Enable Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) where supported

Patch Information

No official patch is available from the vendor. The AllokSoft Homepage does not appear to provide security updates for this legacy software. Organizations are advised to discontinue use of this vulnerable application.

For additional technical details regarding this vulnerability, refer to the Exploit-DB #44518 entry and the VulnCheck Advisory on Allok Software Buffer Overflow.

Workarounds

• Uninstall Allok Video to DVD Burner and migrate to actively maintained DVD authoring software
• If removal is not immediately possible, restrict application usage to isolated, non-networked systems
• Implement application whitelisting to prevent execution of the vulnerable software
• Use virtualization or sandboxing to contain potential exploitation attempts
• Apply Windows exploit protection features such as SEHOP (Structured Exception Handler Overwrite Protection) at the system level

# Windows SEHOP can be enabled via registry (requires restart)
# Run in elevated PowerShell to enable system-wide SEHOP protection
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\kernel" -Name "DisableExceptionChainValidation" -Value 0 -Type DWord