CVE-2017-14323 in Ueditor in Onethink
Summary
by MITRE
SSRF (Server Side Request Forgery) in getRemoteImage.php in Ueditor in Onethink V1.0 and V1.1 allows remote attackers to obtain sensitive information, attack intranet hosts, or possibly trigger remote command execution via the upfile parameter.
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Analysis
by VulDB Data Team • 01/23/2020
The vulnerability identified as CVE-2017-14323 represents a critical server-side request forgery flaw within the Ueditor component of Onethink versions 1.0 and 1.1. This vulnerability resides in the getRemoteImage.php script which processes file uploads and handles remote image retrieval operations. The flaw manifests when the application fails to properly validate and sanitize user-supplied input passed through the upfile parameter, creating an avenue for malicious actors to manipulate the application's behavior and potentially gain unauthorized access to internal systems.
The technical implementation of this vulnerability stems from inadequate input validation mechanisms within the file processing pipeline. When a user submits a request containing a malicious URL through the upfile parameter, the application blindly forwards this request to the specified remote server without proper sanitization or verification. This allows attackers to craft requests that can target internal network resources, bypassing typical network segmentation controls. The vulnerability maps directly to CWE-918, which specifically addresses server-side request forgery conditions where applications fail to properly validate remote resource access. The flaw enables attackers to perform unauthorized access to internal services that would normally be protected by network firewalls and security boundaries.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable full remote command execution capabilities. Attackers can leverage this flaw to scan internal network ranges, access internal services such as databases, web applications, or administrative interfaces, and potentially establish persistent access points within the network. The vulnerability can be exploited to target internal systems that are not directly exposed to the internet, making it particularly dangerous for organizations with complex network architectures. According to ATT&CK framework, this vulnerability aligns with T1190 - Exploit Public-Facing Application and T1071.004 - Application Layer Protocol: DNS, as attackers can use the SSRF capability to perform reconnaissance and lateral movement within the network infrastructure.
Mitigation strategies for CVE-2017-14323 require immediate implementation of input validation and sanitization measures within the affected application. Organizations should implement strict validation of all user-supplied URLs to ensure they conform to expected patterns and do not contain internal network addresses or protocols that could lead to unauthorized access. The solution involves implementing a whitelist approach for allowed domains and protocols, along with comprehensive logging of all file upload activities for security monitoring. Additionally, network-level restrictions should be implemented to prevent outbound connections to internal network addresses from the application server, effectively blocking potential lateral movement attempts. The remediation process should include immediate patching of the Onethink framework to version 1.2 or later, where the vulnerability has been addressed through proper input validation and sanitization mechanisms. Security teams should also implement network segmentation and firewall rules to limit the potential impact of such vulnerabilities, ensuring that even if exploitation occurs, the attacker's access remains constrained to prevent further compromise of the system.