Executive Summary

CVE-2018-25314 is a buffer overflow vulnerability in Allok Soft WMV to AVI MPEG DVD WMV Converter version 4.6.1217. It occurs when a local attacker supplies an excessively long string in the License Name field of the application.

By crafting a malicious input containing shellcode and using a structured exception handler (SEH) overwrite technique, an attacker can bypass protections and execute arbitrary code with the privileges of the application.

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Executive Summary

The vulnerability exists in Allok soft WMV to AVI MPEG DVD WMV Converter version 4.6.1217. It is a buffer overflow issue that occurs when a local attacker supplies an oversized string in the License Name field.

This buffer overflow allows the attacker to execute arbitrary code by crafting malicious input containing shellcode with a structured exception handler (SEH) overwrite. This technique helps bypass protections and enables code execution with the application's privileges.

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Impact Analysis

This vulnerability can allow a local attacker to execute arbitrary code on the affected system with the same privileges as the application. This could lead to unauthorized actions such as installing malware, stealing data, or taking control of the system.

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Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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Impact Analysis

This vulnerability allows local attackers to execute arbitrary code with the same privileges as the vulnerable application. This can lead to local privilege escalation, enabling attackers to run malicious code on the affected system.

Since the exploit involves executing shellcode, attackers can potentially perform any action permitted by the application’s privileges, which may include installing malware, stealing data, or disrupting system operations.

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Detection Guidance

This vulnerability can be detected by checking if the vulnerable application Allok Soft WMV to AVI MPEG DVD WMV Converter version 4.6.1217 is installed on the system.

Since the exploit involves supplying an oversized string in the License Name field, detection can involve monitoring or scanning for unusually long input strings or suspicious activity related to this field.

Specifically, the exploit uses a crafted input of about 4000 bytes with a structured exception handler (SEH) overwrite.

There are no specific network commands provided in the resources, but local detection could involve searching for the presence of the vulnerable software and monitoring for attempts to input excessively long License Name strings.

For example, on Windows systems, you might check installed programs via PowerShell or command line:

• Get-WmiObject -Class Win32_Product | Where-Object { $_.Name -like '*Allok Soft WMV to AVI MPEG DVD WMV Converter*' }
• Or check the registry for installed software entries related to Allok Soft.

Additionally, monitoring application logs or behavior for crashes or exceptions related to the License Name field input might help detect exploitation attempts.

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Mitigation Strategies

The immediate mitigation step is to discontinue the use of Allok Soft WMV to AVI MPEG DVD WMV Converter version 4.6.1217, as the application is no longer maintained and contains a high-severity buffer overflow vulnerability.

Avoid supplying any input in the License Name field that could be excessively long or crafted to exploit the vulnerability.

If continued use is necessary, restrict local access to the application to trusted users only, since the vulnerability requires local attacker privileges.

Consider using alternative software that is actively maintained and does not have this vulnerability.

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