CVE-2025-3485 in Allegra
Summary
by MITRE • 06/06/2025
Allegra extractFileFromZip Directory Traversal Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Allegra. Authentication is required to exploit this vulnerability.
The specific flaw exists within the implementation of the extractFileFromZip method. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-26524.
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Analysis
by VulDB Data Team • 08/18/2025
The CVE-2025-3485 vulnerability represents a critical directory traversal flaw within the Allegra software's extractFileFromZip method, exposing systems to remote code execution attacks. This vulnerability operates at the intersection of improper input validation and insecure file handling practices, creating a pathway for malicious actors to escalate privileges and compromise affected systems. The flaw specifically manifests when the application processes zip file contents without adequately sanitizing user-provided file paths, allowing attackers to manipulate the extraction process through carefully crafted archive contents.
The technical implementation of this vulnerability stems from inadequate path validation mechanisms within the zip extraction routine. When the extractFileFromZip method processes compressed files, it fails to properly sanitize or validate the file paths contained within the archive before performing actual file operations. This absence of input validation creates a condition where attacker-controlled paths can bypass normal file system boundaries, potentially enabling access to arbitrary file locations on the target system. The vulnerability aligns with CWE-22, which specifically addresses directory traversal or path traversal issues, and represents a classic example of insecure file handling in software applications.
From an operational perspective, this vulnerability presents significant risk to organizations utilizing Allegra software, particularly in environments where zip file processing is common. The requirement for authentication to exploit the vulnerability does not diminish its severity, as it can be leveraged by authenticated attackers who may have legitimate access to the system. Attackers can craft malicious zip archives containing specially formatted file paths that, when processed by the vulnerable application, result in arbitrary code execution with the privileges of the running process. This could potentially lead to complete system compromise, data exfiltration, or establishment of persistent backdoors within the network infrastructure.
The security implications extend beyond simple code execution, as this vulnerability can be exploited to perform lateral movement within network environments where the affected software is deployed. Attackers may use the vulnerability to gain access to sensitive data, escalate privileges, or establish command and control channels. The vulnerability's classification under ATT&CK framework would likely map to techniques involving privilege escalation and execution through legitimate system processes, making detection and mitigation more challenging for security teams. Organizations should implement immediate patching procedures and consider network segmentation to limit potential lateral movement if exploitation occurs.
Mitigation strategies should focus on immediate patch deployment as provided by the vendor, along with network-level controls to restrict access to zip file processing capabilities where possible. Security teams should monitor for suspicious file extraction activities and implement proper input validation at multiple layers of the application architecture. Additional protective measures include restricting file system permissions for affected applications, implementing application whitelisting policies, and conducting comprehensive security assessments to identify similar vulnerabilities in other software components that may exhibit similar path traversal behaviors. The vulnerability serves as a reminder of the critical importance of input validation and secure coding practices in preventing directory traversal attacks that can lead to complete system compromise.