CVE-2022-40407 in Chamilo
Summary
by MITRE • 09/29/2022
A zip slip vulnerability in the file upload function of Chamilo v1.11 allows attackers to execute arbitrary code via a crafted Zip file.
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Analysis
by VulDB Data Team • 09/30/2022
The zip slip vulnerability in Chamilo v1.11 represents a critical security flaw that exploits improper handling of archive extraction processes within the platform's file upload functionality. This vulnerability specifically affects the way the system processes zip files, creating an opportunity for attackers to manipulate file paths during extraction and potentially overwrite critical system files or execute malicious code. The vulnerability stems from inadequate validation of file paths contained within compressed archives, allowing attackers to craft malicious zip files that can exploit path traversal mechanisms during decompression. This issue directly relates to common weakness enumeration CWE-22, which identifies path traversal vulnerabilities that occur when input data is not properly sanitized before being used in file system operations.
The technical exploitation of this vulnerability occurs when Chamilo processes uploaded zip files containing specially crafted archive entries with malicious path structures such as ../ or ..\ sequences. During the extraction process, the system fails to validate or sanitize these paths, allowing the archive contents to be written to arbitrary locations on the target system. Attackers can leverage this to place malicious files in critical directories such as the web root, application directories, or system execution paths, thereby achieving arbitrary code execution capabilities. The vulnerability is particularly dangerous because it can be exploited through legitimate file upload interfaces without requiring elevated privileges or authentication, making it an attractive target for remote attackers seeking to compromise the platform.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and data breaches. Successful exploitation could allow attackers to gain persistent access to the Chamilo learning management system, potentially leading to unauthorized access to student records, course materials, and administrative functions. The vulnerability affects organizations using Chamilo v1.11 deployments, which are commonly found in educational institutions and corporate training environments where sensitive data is stored and managed. The attack surface is particularly concerning given that many organizations rely on automated file upload processes for course content management, making the exploitation vector both frequent and difficult to detect. This vulnerability aligns with attack techniques described in the mitre attack framework under initial access and execution phases, where adversaries leverage software vulnerabilities to establish footholds within target environments.
Organizations should implement immediate mitigations including applying the latest security patches provided by Chamilo developers, implementing strict file validation on all uploaded archives, and configuring proper path sanitization during archive extraction processes. Additional defensive measures should include restricting file upload permissions, implementing network segmentation to limit access to vulnerable systems, and monitoring for suspicious file extraction activities. Security teams should also consider deploying web application firewalls to detect and block malicious zip file uploads, while establishing comprehensive logging and monitoring of file system operations to identify potential exploitation attempts. The vulnerability highlights the importance of proper input validation and secure coding practices, particularly when handling user-supplied data in file system operations, and serves as a reminder of the critical need for regular security assessments of educational technology platforms.