CVE-2018-25302 in Allok AVI to DVD SVCD VCD Converter
Summary
by MITRE • 04/29/2026
Allok AVI to DVD SVCD VCD Converter 4.0.1217 contains a structured exception handling (SEH) based buffer overflow vulnerability that allows local attackers to execute arbitrary code by supplying a malicious string in the License Name field. Attackers can craft a payload with junk data, NSEH bypass, SEH handler address, and shellcode that triggers the overflow when pasted into the License Name field and the Register button is clicked, resulting in code execution.
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Analysis
by VulDB Data Team • 06/26/2026
This vulnerability exists within Allok AVI to DVD SVCD VCD Converter version 4.0.1217 where a structured exception handling seh based buffer overflow occurs when processing user input in the license name field. The flaw stems from inadequate input validation and memory management practices that fail to properly bounds check the length of data entered into the registration interface. When an attacker supplies a maliciously crafted string containing excessive data to the License Name field, the application's structured exception handler mechanism becomes compromised through stack buffer overflow conditions. This particular vulnerability falls under the CWE-121 heap-based buffer overflow category but manifests specifically through SEH manipulation techniques that exploit the Windows exception handling architecture.
The exploitation process requires careful crafting of a payload that includes junk data to overwrite the stack frame, followed by an NSEH bypass mechanism to ensure proper execution flow continues past the initial exception handler. Attackers must then place the correct SEH handler address within their malicious input to redirect program execution control flow and subsequently inject shellcode that executes in the context of the running application process. The vulnerability is particularly dangerous because it allows local privilege escalation without requiring network access, as the attack vector operates entirely within the application's own memory space. This represents a classic example of how improper input validation combined with unsafe buffer manipulation can lead to complete system compromise.
The operational impact of this vulnerability extends beyond simple code execution as it provides attackers with arbitrary code execution capabilities within the context of the application process, potentially enabling privilege escalation attacks or further exploitation of the target system. When an unsuspecting user clicks the Register button after pasting the malicious payload into the License Name field, the application crashes and immediately executes the attacker's shellcode, bypassing normal security controls typically present in modern operating systems. The vulnerability exists due to a lack of proper input sanitization and stack protection mechanisms that should have been implemented during the software development lifecycle.
Mitigation strategies for this vulnerability include immediate patching of the affected software version through official vendor updates, which typically involve implementing proper bounds checking and stack buffer overflow protections. System administrators should consider implementing application whitelisting policies to restrict execution of untrusted binaries, while also deploying intrusion detection systems that can identify suspicious SEH manipulation patterns in network traffic. The ATT&CK framework categorizes this vulnerability under T1059 command and scripting interpreter techniques where attackers leverage application-specific buffer overflows to execute malicious code. Additionally, implementing stack protection mechanisms such as stack canaries and address space layout randomization can significantly reduce exploitation success rates. Organizations should also conduct regular security assessments of third-party applications to identify similar vulnerabilities and implement comprehensive software supply chain security measures to prevent such issues from occurring in future deployments.