CVE-2018-25315 Overview
CVE-2018-25315 is a buffer overflow vulnerability affecting Alloksoft Video Joiner version 4.6.1217. This vulnerability allows local attackers to execute arbitrary code by supplying a specially crafted malicious string in the License Name field during the application's license registration process. Attackers can exploit this flaw using structured exception handler (SEH) overwrite techniques combined with shellcode to achieve code execution when the application processes the malicious license registration input.
Critical Impact
Local attackers can achieve arbitrary code execution through buffer overflow exploitation in the License Name registration field, potentially leading to complete system compromise.
Affected Products
- Alloksoft Video Joiner 4.6.1217
Discovery Timeline
- 2026-04-29 - CVE CVE-2018-25315 published to NVD
- 2026-04-29 - Last updated in NVD database
Technical Details for CVE-2018-25315
Vulnerability Analysis
This vulnerability is classified as CWE-120 (Buffer Copy without Checking Size of Input), commonly known as a classic buffer overflow. The flaw exists in how Alloksoft Video Joiner handles user-supplied input in the License Name field during the license registration process. The application fails to properly validate the length of the input string before copying it into a fixed-size buffer, allowing attackers to overflow the buffer and overwrite adjacent memory structures.
The attack requires local access to the system where the vulnerable application is installed. No authentication or user privileges are required to trigger the vulnerability, and no user interaction beyond normal application usage is necessary. A successful exploit results in high impact to confidentiality, integrity, and availability of the affected system.
Root Cause
The root cause of this vulnerability is improper input validation in the license registration functionality of Alloksoft Video Joiner. The application allocates a fixed-size buffer for storing the License Name input but does not enforce any bounds checking when copying user-supplied data into this buffer. This allows an attacker to submit an oversized string that exceeds the allocated buffer size, causing memory corruption.
Attack Vector
The attack is local in nature, requiring the attacker to have access to the system where Alloksoft Video Joiner is installed. The exploitation technique involves crafting a payload that overwrites the Structured Exception Handler (SEH) chain. When the buffer overflow triggers an exception, the corrupted SEH pointer redirects execution to attacker-controlled shellcode.
The typical exploitation flow involves:
- Identifying the buffer offset required to reach the SEH overwrite location
- Crafting a payload containing a SEH overwrite address pointing to a POP-POP-RET gadget
- Including shellcode after the SEH overwrite to execute arbitrary commands
- Entering the malicious payload in the License Name field
For detailed exploitation techniques and proof-of-concept code, refer to the Exploit-DB #44364 advisory.
Detection Methods for CVE-2018-25315
Indicators of Compromise
- Unusual process behavior from VideoJoiner.exe or related Alloksoft processes
- Unexpected child processes spawned by the Video Joiner application
- Crash dumps or application faults related to SEH exceptions in the Video Joiner software
- Registry modifications in license-related keys for Alloksoft products
Detection Strategies
- Monitor for SEH overwrite patterns in process memory associated with Alloksoft Video Joiner
- Implement application whitelisting to prevent unauthorized code execution from the Video Joiner process context
- Deploy endpoint detection and response (EDR) solutions to identify exploitation attempts via behavioral analysis
- Configure SIEM rules to alert on abnormal process spawning from media editing applications
Monitoring Recommendations
- Enable detailed logging for application crash events and exception handling
- Monitor system integrity for unexpected changes following Video Joiner usage
- Track network connections initiated by the Video Joiner process for potential post-exploitation activity
- Implement file integrity monitoring on the Alloksoft installation directory
How to Mitigate CVE-2018-25315
Immediate Actions Required
- Discontinue use of Alloksoft Video Joiner version 4.6.1217 until a patched version is available
- Remove the vulnerable application from systems where it is not strictly necessary
- Restrict local access to systems where the vulnerable software must remain installed
- Deploy endpoint protection solutions capable of detecting buffer overflow exploitation attempts
Patch Information
No official patch information is available from the vendor at this time. Users should check the AllokSoft Official Website and the AllokSoft Joiner Software Page for potential updates. Additionally, the VulnCheck AllokSoft Advisory may provide updated remediation guidance.
Workarounds
- Consider using alternative video joining software that receives active security maintenance
- Implement application sandboxing to limit the potential impact of exploitation
- Apply Windows Defender Exploit Guard or similar exploit mitigation technologies (ASLR, DEP, SEHOP) to help prevent successful exploitation
- Restrict physical and remote access to workstations with the vulnerable software installed
# Enable Windows exploit mitigations via PowerShell
# Enable DEP (Data Execution Prevention) system-wide
bcdedit /set nx AlwaysOn
# Enable SEHOP for additional SEH protection
Set-ProcessMitigation -System -Enable SEHOP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
