CVE-2018-25219 in Excel Password Recovery
Summary
by MITRE • 03/26/2026
PassFab Excel Password Recovery 8.3.1 contains a structured exception handling buffer overflow vulnerability that allows local attackers to execute arbitrary code by supplying a malicious payload in the registration code field. Attackers can craft a buffer overflow payload with a pop-pop-ret gadget and shellcode that triggers code execution when pasted into the Licensed E-mail and Registration Code field during the registration process.
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Analysis
by VulDB Data Team • 03/26/2026
The vulnerability identified as CVE-2018-25219 represents a critical buffer overflow flaw within PassFab Excel Password Recovery version 8.3.1 that exploits structured exception handling mechanisms to enable local privilege escalation and arbitrary code execution. This vulnerability specifically targets the registration process where users input their licensed email and registration code information, creating an attack surface that can be exploited by malicious actors with local system access. The flaw resides in how the application processes user-supplied data in the registration fields, particularly when handling malformed input that exceeds allocated buffer boundaries. The vulnerability's classification as a structured exception handling buffer overflow indicates that the application's exception handling routines are improperly configured to manage memory boundaries, creating opportunities for attackers to manipulate execution flow through carefully crafted inputs.
The technical exploitation of this vulnerability requires attackers to construct a sophisticated payload that leverages pop-pop-ret gadgets, which are sequences of assembly instructions commonly used in return-oriented programming attacks to manipulate the stack and control program execution flow. These gadgets enable attackers to bypass modern security mechanisms such as stack canaries and address space layout randomization by chaining together small instruction sequences that exist within the application's memory space. The shellcode embedded within the malicious payload is designed to execute in the context of the running application process, potentially escalating privileges and establishing persistent access to the compromised system. The attack vector specifically targets the registration code field where the application fails to properly validate or sanitize input length, allowing attackers to overflow the designated buffer and overwrite adjacent memory structures including return addresses and exception handling data.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with a persistent foothold within the target system through local privilege escalation capabilities. Once exploited, the malicious payload can establish backdoors, exfiltrate sensitive data, or create additional attack vectors for further compromise of the system. The vulnerability affects any local user who has access to the application, making it particularly dangerous in multi-user environments where attackers can leverage legitimate user accounts to execute malicious code. The attack requires minimal privileges to succeed, as the vulnerability operates within the context of the application itself rather than requiring administrative access, which significantly increases the attack surface and potential impact. This type of vulnerability can be particularly challenging to detect and remediate, as it often requires deep analysis of the application's memory management and exception handling routines.
Mitigation strategies for CVE-2018-25219 should focus on immediate software updates from the vendor, as the vulnerability has been addressed in subsequent releases of PassFab Excel Password Recovery. Organizations should implement network segmentation and access controls to limit local system access to applications with known vulnerabilities, while also deploying application whitelisting solutions to prevent execution of unauthorized code. System administrators should conduct comprehensive vulnerability assessments to identify all instances of the affected software across their network infrastructure, particularly in environments where users have elevated privileges or access to sensitive data. The vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1068 for exploit for privilege escalation, making it a significant concern for enterprise security teams. Additionally, implementing robust input validation and memory safety checks in application code development processes can prevent similar vulnerabilities from being introduced in future versions, as this flaw demonstrates the critical importance of proper buffer management and exception handling in software security design. Organizations should also consider deploying intrusion detection systems and endpoint protection solutions that can monitor for suspicious execution patterns and anomalous behavior indicative of exploitation attempts.