CVE-2021-43685 in libretime
Summary
by MITRE • 12/01/2021
libretime hv3.0.0-alpha.10 is affected by a path manipulation vulnerability in /blob/master/legacy/application/modules/rest/controllers/ShowImageController.php through the rename function.
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Analysis
by VulDB Data Team • 12/08/2021
The vulnerability identified as CVE-2021-43685 affects libretime version 3.0.0-alpha.10 and stems from a path manipulation flaw within the ShowImageController.php file located in the legacy application modules rest controllers directory. This issue specifically manifests through the improper handling of file renaming operations, creating potential security risks for systems utilizing this media streaming platform. The vulnerability resides in the legacy codebase which suggests it may have been introduced during earlier development phases and not properly addressed in subsequent security reviews.
The technical flaw involves the rename function implementation that fails to properly validate or sanitize file paths before executing file system operations. When users or applications interact with the show image controller, the system processes file renaming requests without adequate input validation, allowing attackers to manipulate file paths through malicious input. This path manipulation vulnerability falls under the category of CWE-73 Path Traversal, where an attacker can manipulate file paths to access unauthorized files or directories. The vulnerability represents a classic example of insufficient input sanitization that can lead to arbitrary file operations.
The operational impact of this vulnerability extends beyond simple path traversal, as it could potentially allow attackers to overwrite critical system files, access sensitive data, or even execute arbitrary code depending on the system configuration and permissions. In a media streaming environment like libretime, this could enable unauthorized users to manipulate broadcast content, access administrative files, or disrupt service availability. The attack surface is particularly concerning given that this affects the show image controller, which likely handles media asset management and could provide access to broadcast-related files and metadata.
Mitigation strategies should focus on implementing proper input validation and sanitization for all file path operations within the affected controller. The system should employ absolute path resolution and validate that all file operations occur within designated safe directories. Implementing proper access controls and privilege separation would further reduce the impact of potential exploitation. Organizations using libretime should also consider applying immediate patches or updates to address this vulnerability, while conducting thorough security reviews of other legacy components that may contain similar path manipulation flaws. The remediation approach should align with ATT&CK framework techniques related to privilege escalation and defense evasion through file and directory permissions manipulation. Additionally, implementing proper logging and monitoring of file system operations would aid in detecting potential exploitation attempts and provide forensic evidence for security incident response activities.