CVE-2019-25336 in Nsauditor SpotAuditor
Summary
by MITRE • 02/13/2026
SpotAuditor 5.3.2 contains a local buffer overflow vulnerability in the Base64 Encrypted Password tool that allows attackers to execute arbitrary code by crafting a malicious payload. Attackers can generate a specially crafted Base64 encoded payload to trigger a Structured Exception Handler (SEH) overwrite and execute shellcode on the vulnerable system.
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Analysis
by VulDB Data Team • 02/21/2026
The vulnerability identified as CVE-2019-25336 represents a critical local buffer overflow flaw within SpotAuditor version 5.3.2, specifically affecting the Base64 Encrypted Password tool component. This vulnerability exposes the application to arbitrary code execution risks when processing maliciously crafted input data, creating a significant security risk for systems running the affected software. The flaw resides in how the application handles Base64 encoded payloads, making it particularly dangerous as attackers can leverage standard encoding techniques to exploit the vulnerability.
The technical implementation of this vulnerability stems from improper input validation and memory management within the Base64 decryption routine of SpotAuditor. When the application processes a specially crafted Base64 encoded payload, it fails to properly bounds-check the input data before copying it into a fixed-size buffer. This oversight creates a classic buffer overflow condition that allows attackers to overwrite adjacent memory locations. The vulnerability specifically targets the Structured Exception Handler (SEH) chain, which is a critical Windows security mechanism used for exception handling and program recovery. By carefully crafting the malicious payload, attackers can overwrite the SEH record, redirecting program execution flow to malicious shellcode that has been injected into the application's memory space.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with elevated privileges within the context of the vulnerable application. Since SpotAuditor typically runs with administrative privileges to perform system auditing tasks, successful exploitation could lead to complete system compromise. The vulnerability's local nature means that an attacker must already have access to the target system, but once exploited, the attacker can leverage the elevated privileges to perform actions such as privilege escalation, data exfiltration, or installation of persistent backdoors. This makes the vulnerability particularly dangerous in environments where SpotAuditor is used for system administration tasks, as the attack surface expands significantly.
From a cybersecurity perspective, this vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and demonstrates characteristics consistent with ATT&CK technique T1059.007 for command and scripting interpreter. The SEH overwrite mechanism employed in this exploit represents a well-established exploitation technique that has been documented in numerous security research publications and defensive strategies. Organizations should implement immediate mitigations including disabling the vulnerable Base64 Encrypted Password tool functionality, applying vendor patches when available, and implementing application whitelisting controls to prevent unauthorized execution of malicious payloads. Additionally, system administrators should monitor for unusual process execution patterns and implement proper input validation controls to prevent similar vulnerabilities from being exploited in other applications. The vulnerability serves as a reminder of the critical importance of proper memory management and input validation in security-critical applications, particularly those handling user-supplied data in privileged contexts.