CVE-2020-25359 in rConfig
Summary
by MITRE • 08/20/2021
An arbitrary file deletion vulnerability in rConfig 3.9.5 has been fixed for 3.9.6. This vulnerability gave attackers the ability to send a crafted request to /lib/ajaxHandlers/ajaxDeleteAllLoggingFiles.php by specifying a path in the path parameter and an extension in the ext parameter and delete all the files with that extension in that path.
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Analysis
by VulDB Data Team • 08/25/2021
The vulnerability identified as CVE-2020-25359 represents a critical arbitrary file deletion flaw within rConfig version 3.9.5 that was subsequently addressed in version 3.9.6. This issue resides in the application's file handling mechanism, specifically within the /lib/ajaxHandlers/ajaxDeleteAllLoggingFiles.php component which processes user-supplied input without adequate validation or sanitization. The flaw manifests when attackers can manipulate the path and ext parameters to target and remove files from the system, creating a potential pathway for complete system compromise through unauthorized file deletion operations.
The technical implementation of this vulnerability stems from insufficient input validation and improper access controls within the application's logging file management system. When the application receives a request containing crafted path and extension parameters, it directly processes these inputs to locate and delete files matching the specified criteria without verifying whether the requested operations fall within legitimate administrative boundaries. This represents a classic case of insecure direct object reference vulnerability where user-controllable input is used to determine file operations, allowing attackers to potentially target system files beyond the intended logging directories.
From an operational impact perspective, this vulnerability poses significant risks to system integrity and availability. Attackers could exploit this flaw to delete critical system files, application binaries, or sensitive configuration data, potentially leading to complete system compromise or denial of service conditions. The vulnerability's exploitation capability extends beyond simple file deletion to include potential privilege escalation scenarios where attackers might target system-critical files to gain further access or disrupt normal operations. The impact is particularly severe in environments where rConfig is used for network infrastructure management or system monitoring, as the deletion of logging files could interfere with security monitoring and incident response capabilities.
Security professionals should consider this vulnerability in the context of the CWE (Common Weakness Enumeration) framework, specifically categorizing it under CWE-22 which describes improper limitation of a pathname to a restricted directory, and CWE-775 which addresses missing file deletion operations. The vulnerability aligns with ATT&CK tactics including TA0005 (Defense Evasion) and TA0009 (Collection) as attackers could use this to remove forensic evidence or disrupt logging capabilities. Organizations should implement immediate mitigations including updating to rConfig 3.9.6, implementing proper input validation for all file operations, and restricting access to administrative endpoints through network segmentation and authentication controls. Additionally, comprehensive monitoring of file deletion activities and regular security audits of file handling mechanisms should be implemented to detect and prevent unauthorized exploitation attempts.