CVE-2018-6029 in NoneCms
Summary
by MITRE
The copy function in application/admin/controller/Article.php in NoneCms 1.3.0 allows remote attackers to access the content of internal and external network resources via Server Side Request Forgery (SSRF), because URL validation only considers whether the URL contains the "csdn" substring.
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Analysis
by VulDB Data Team • 12/29/2019
The vulnerability identified as CVE-2018-6029 represents a critical server-side request forgery flaw in NoneCms version 1.3.0 that exposes the application to unauthorized access of internal and external network resources. This security weakness resides within the copy function implementation in the Article.php controller file located at application/admin/controller/Article.php. The flaw stems from inadequate input validation mechanisms that fail to properly verify the legitimacy of requested URLs, creating a pathway for malicious actors to exploit the system's trust in seemingly benign requests.
The technical implementation of this vulnerability demonstrates a fundamental flaw in the application's security architecture where URL validation logic relies solely on a substring check for "csdn" within the requested URL. This simplistic validation approach creates a dangerous attack surface as it does not properly sanitize or verify the complete URL structure, allowing attackers to craft malicious requests that bypass the intended security boundaries. The vulnerability operates under the common pattern of insecure direct object references where the application fails to establish proper boundaries between trusted and untrusted inputs, enabling attackers to manipulate the application's behavior through crafted requests.
From an operational perspective, this SSRF vulnerability presents significant risks to organizations using NoneCms 1.3.0 as it allows remote attackers to potentially access internal network resources that would normally be protected by firewalls and network segmentation. Attackers can leverage this flaw to perform reconnaissance activities, access internal services, databases, or other sensitive resources that are typically isolated from external network access. The impact extends beyond simple information disclosure as it can enable further exploitation through lateral movement, privilege escalation, or the exploitation of other vulnerabilities within the internal network infrastructure.
The vulnerability aligns with CWE-918, which specifically addresses server-side request forgery weaknesses where applications fail to properly validate and sanitize user-supplied URLs. This weakness falls under the broader category of insecure communication patterns and demonstrates poor input validation practices that have been consistently identified as critical security flaws in web applications. The ATT&CK framework categorizes this vulnerability under T1071.004 for application layer protocol usage and T1105 for remote file execution, as it enables attackers to manipulate application behavior and potentially execute arbitrary commands through the compromised copy functionality.
Mitigation strategies for CVE-2018-6029 should focus on implementing comprehensive URL validation mechanisms that go beyond simple substring matching to include proper URL parsing, domain whitelisting, and network boundary enforcement. Organizations should immediately upgrade to patched versions of NoneCms or implement network-level restrictions that prevent outbound requests to internal network ranges. Input sanitization measures must include complete URL validation using proper parsing libraries, implementation of allowlists for trusted domains, and enforcement of strict network segmentation policies. Additionally, security monitoring should be enhanced to detect anomalous request patterns that may indicate exploitation attempts, while regular security assessments should be conducted to identify similar validation weaknesses in other application components.