CVE-2019-25650 in River Past CamDo
Summary
by MITRE • 03/26/2026
River Past CamDo 3.7.6 contains a structured exception handler (SEH) buffer overflow vulnerability that allows local attackers to execute arbitrary code by supplying a malicious string in the Lame_enc.dll name field. Attackers can craft a payload with a 280-byte buffer, NSEH jump instruction, and SEH handler address pointing to a pop-pop-ret gadget to trigger code execution and establish a bind shell on port 3110.
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Analysis
by VulDB Data Team • 05/06/2026
The vulnerability identified as CVE-2019-25650 represents a critical structured exception handler buffer overflow flaw within River Past CamDo version 3.7.6. This software application, designed for video capture and processing, incorporates a vulnerable component in its Lame_enc.dll library that exposes a path for local privilege escalation and arbitrary code execution. The flaw manifests specifically when the application processes a malicious string within the Lame_enc.dll name field, creating a dangerous condition that can be exploited by attackers with local system access. The vulnerability falls under the category of buffer overflow attacks, which are classified as CWE-121 in the Common Weakness Enumeration system, representing unsafe array access that can lead to memory corruption and execution control manipulation.
The technical implementation of this vulnerability relies on the exploitation of the Windows structured exception handling mechanism, which is a fundamental component of the windows operating system security model. When the vulnerable application processes the malicious input string, it fails to properly validate the length of the supplied data, allowing an attacker to overwrite the structured exception handler chain. The attack payload specifically requires a 280-byte buffer to fill the existing stack space, followed by a non-standard exception handler (NSEH) jump instruction that redirects execution flow. This technique leverages the SEH overflow to overwrite the exception handler address with a pointer to a pop-pop-ret gadget, which is a common exploitation method in windows buffer overflow scenarios. The pop-pop-ret gadget serves as a crucial component in the exploit chain by allowing the attacker to manipulate the stack pointer and control the execution flow effectively. This approach is consistent with the techniques documented in the attack mitigation frameworks, particularly those addressing the exploitation of SEH mechanisms through the use of return-oriented programming concepts.
The operational impact of this vulnerability extends beyond simple code execution, as it enables attackers to establish a persistent bind shell on port 3110, providing them with remote access capabilities to the compromised system. The local privilege escalation aspect means that an attacker with minimal system access can potentially gain elevated privileges, making this vulnerability particularly dangerous in environments where users may have access to the application but not necessarily administrative rights. The bind shell establishment creates a persistent backdoor that allows continuous access to the compromised system, enabling further reconnaissance, data exfiltration, or lateral movement within the network. This vulnerability demonstrates the importance of proper input validation and memory management practices in software development, as even local applications can pose significant security risks when they fail to properly handle user-supplied data.
Mitigation strategies for this vulnerability should focus on both immediate remediation and long-term architectural improvements. The most effective immediate solution involves applying the vendor-provided patch or upgrading to a newer version of River Past CamDo that addresses this specific buffer overflow issue. Organizations should also implement input validation measures at the application level, ensuring that all user-supplied data is properly sanitized before processing. The implementation of stack canaries, address space layout randomization, and data execution prevention mechanisms can provide additional layers of protection against similar vulnerabilities. From a security monitoring perspective, organizations should establish detection capabilities for unusual network activity on port 3110, as this port is specifically targeted by the exploit. The vulnerability also highlights the importance of regular security assessments and penetration testing to identify similar issues in legacy applications, particularly those that may not receive regular updates or patches from their vendors. This case study reinforces the fundamental principles of secure coding practices and demonstrates how seemingly minor input validation flaws can result in significant security breaches.