Overview
CVE-2025-29864 is a Protection Mechanism Failure vulnerability identified in ESTsoft ALZip, a popular file compression and archiving utility for Windows. This vulnerability allows attackers to bypass the Windows SmartScreen filter, potentially leading to the execution of malicious code disguised within seemingly harmless archives. This issue affects ALZip versions 12.01 up to, but not including, version 12.29.
Technical Details
The specifics of the vulnerability relate to how ALZip handles certain file operations or archive structures. A specially crafted archive, when processed by vulnerable versions of ALZip, can trigger a condition where Windows SmartScreen is not properly invoked or bypassed entirely. This can occur due to how ALZip interacts with the Windows API, potentially misinterpreting file attributes or failing to properly signal the need for SmartScreen checks. The exact exploitation vector would require deeper reverse engineering, but the end result is the ability to execute untrusted code without SmartScreen intervention.
CVSS Analysis
Currently, the CVSS score for CVE-2025-29864 is listed as N/A (Not Available). This likely indicates that the vulnerability is either newly discovered or the severity assessment is still underway. However, the potential for SmartScreen bypass suggests a moderate to high risk, depending on the ease of exploitation and the potential impact of malicious code execution. Once a CVSS score is published, this section will be updated accordingly. Note that even without a CVSS score, the risk of SmartScreen bypass should be taken seriously.
Possible Impact
The SmartScreen bypass enabled by CVE-2025-29864 can have significant security implications:
- Malware Infection: Attackers can distribute malware disguised as legitimate files within archives. Users who extract and execute these files will unknowingly infect their systems.
- Phishing Attacks: Malicious files can be crafted to resemble legitimate documents, enticing users to open them and potentially falling victim to phishing scams.
- Ransomware Deployment: Ransomware can be distributed through this vulnerability, encrypting user data and demanding payment for its recovery.
- Data Theft: Malicious code can be used to steal sensitive information from the compromised system.
Mitigation and Patch Steps
The primary mitigation step is to update ALZip to version 12.29 or later. ESTsoft has released a patch to address this vulnerability. Follow these steps:
- Download the latest version: Visit the official ALZip website (https://altools.co.kr/product/ALZIP) and download the newest version of ALZip.
- Install the update: Run the downloaded installer and follow the on-screen instructions to update your ALZip installation.
- Verify the installation: After the installation, verify that you are running ALZip version 12.29 or later. You can find the version number in the “About” section of the ALZip application.
In addition to updating ALZip, consider these general security best practices:
- Exercise caution when opening attachments: Be wary of opening archives or files from unknown or untrusted sources.
- Keep your antivirus software updated: Ensure that your antivirus software is running and has the latest definitions.
- Be vigilant about suspicious behavior: Monitor your system for any unusual activity or performance issues.
