CVE-2017-16614 in tpshop
Summary
by MITRE
SSRF (Server Side Request Forgery) in tpshop 2.0.5 and 2.0.6 allows remote attackers to obtain sensitive information, attack intranet hosts, or possibly trigger remote command execution via the plugins/payment/weixin/lib/WxPay.tedatac.php fBill parameter.
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Analysis
by VulDB Data Team • 01/18/2020
The vulnerability identified as CVE-2017-16614 represents a critical server-side request forgery flaw in tpshop versions 2.0.5 and 2.0.6. This type of vulnerability falls under the Common Weakness Enumeration category CWE-918, which specifically addresses server-side request forgery conditions where applications fail to properly validate or sanitize user-supplied input that influences HTTP requests. The vulnerability manifests within the payment plugin system, specifically in the plugins/payment/weixin/lib/WxPay.tedatac.php file where the fBill parameter is processed without adequate validation mechanisms. Attackers can exploit this weakness to manipulate the application's behavior by directing it to make HTTP requests to arbitrary destinations, potentially bypassing network segmentation controls and accessing internal systems that would normally be protected from external access.
The technical implementation of this vulnerability occurs when the application processes the fBill parameter through the WxPay.tedatac.php file, which lacks proper input sanitization and validation checks. This allows remote attackers to supply malicious input that gets directly incorporated into subsequent HTTP requests made by the server. The flaw enables attackers to perform reconnaissance activities by accessing internal network resources, potentially discovering sensitive information about internal services, databases, or other systems that are not exposed to the internet. The vulnerability is particularly dangerous because it can be leveraged to attack intranet hosts that are normally protected by firewalls and network security controls, effectively bypassing traditional perimeter security measures.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable more severe attacks including remote command execution. When attackers can manipulate the server to make requests to internal services, they may be able to exploit additional vulnerabilities in those systems or gain unauthorized access to sensitive data. The attack surface is significantly expanded as the vulnerability allows for both passive reconnaissance and active exploitation phases. Security professionals should note that this vulnerability aligns with ATT&CK technique T1071.004 for application layer protocol manipulation and T1046 for network service scanning, as attackers can use this flaw to map internal network topology and identify vulnerable services. The potential for remote code execution makes this particularly dangerous as it could allow attackers to establish persistent access to the affected system and potentially move laterally throughout the network infrastructure.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and sanitization mechanisms within the affected application components. Organizations should immediately upgrade to tpshop versions that contain patches addressing this specific flaw, as the vendor has likely released security updates to resolve the issue. Network segmentation controls should be reviewed to limit the potential impact of successful exploitation, and firewall rules should be implemented to restrict unnecessary internal communications. Additionally, implementing web application firewalls with rules specifically designed to detect and block suspicious parameter values in the fBill field would provide an additional layer of protection. Security monitoring should be enhanced to detect anomalous outbound network requests from the affected system, particularly those targeting internal IP ranges or unusual ports. Regular security assessments should be conducted to identify similar vulnerabilities in other application components and ensure that proper input validation is consistently applied across all user-facing parameters.