CVE-2019-10265 in Cloud Backup Suite
Summary
by MITRE
An issue was discovered in Ahsay Cloud Backup Suite before 8.1.1.50. On the /cbs/system/ShowAdvanced.do "File Explorer" screen, it is possible to change the directory in the JavaScript code. If changed to (for example) "C:" then one can browse the whole server.
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Analysis
by VulDB Data Team • 11/13/2023
The vulnerability identified as CVE-2019-10265 affects the Ahsay Cloud Backup Suite version 8.1.1.50 and earlier, representing a critical directory traversal flaw that exposes system directories to unauthorized access. This security weakness exists within the web-based administrative interface of the backup solution, specifically on the /cbs/system/ShowAdvanced.do page which provides a file explorer functionality. The flaw stems from insufficient input validation and improper access control mechanisms that allow remote attackers to manipulate JavaScript code parameters to navigate beyond intended directory boundaries. The vulnerability creates a path traversal condition that enables attackers to browse the entire server filesystem by simply modifying directory references in the JavaScript code, potentially exposing sensitive data and system information to unauthorized parties.
The technical implementation of this vulnerability involves a classic lack of proper input sanitization and access control enforcement within the web application's file explorer component. When users interact with the ShowAdvanced.do page, the application fails to validate or restrict directory traversal parameters properly, allowing attackers to modify JavaScript variables that control the directory browsing functionality. This weakness directly maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as directory traversal or path traversal vulnerabilities. The vulnerability's exploitation requires minimal technical expertise and can be executed through simple parameter manipulation, making it particularly dangerous in environments where administrative access is not properly secured. Attackers can leverage this flaw to enumerate system directories, potentially discovering sensitive files, configuration data, and other system artifacts that could aid in further exploitation attempts.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with comprehensive access to the underlying server filesystem. This access could enable attackers to discover critical system files, configuration databases, backup data, and potentially sensitive information stored on the server. The vulnerability's severity is compounded by the fact that it affects the administrative interface of a backup solution, which typically operates with elevated privileges and access to sensitive organizational data. From an adversary perspective, this vulnerability aligns with ATT&CK technique T1083 (File and Directory Discovery) and T1005 (Data from Local System), allowing for systematic reconnaissance and data exfiltration. The attack surface is particularly concerning for organizations relying on Ahsay Cloud Backup Suite for their data protection infrastructure, as compromised administrative access could lead to complete system compromise and unauthorized data access.
Organizations affected by this vulnerability should immediately upgrade to Ahsay Cloud Backup Suite version 8.1.1.50 or later, which contains the necessary patches to address the directory traversal issue. The fix implemented by Ahsay likely includes proper input validation, parameter sanitization, and access control enforcement within the file explorer component. Security teams should conduct comprehensive assessments of their backup infrastructure to identify any potential exploitation attempts and monitor network traffic for suspicious directory traversal activities. Additional mitigations include implementing network segmentation to restrict access to administrative interfaces, enforcing strict authentication mechanisms, and establishing robust monitoring controls for file system access patterns. Organizations should also consider implementing web application firewalls to detect and block malicious directory traversal attempts, while ensuring that administrative interfaces are not directly exposed to untrusted networks. Regular security audits of backup systems and administrative interfaces remain crucial for maintaining defense in depth against similar vulnerabilities.