CVE-2017-8110 in Shopsoftware
Summary
by MITRE
www.modified-shop.org modified eCommerce Shopsoftware 2.0.2.2 rev 10690 has XXE in api/it-recht-kanzlei/api-it-recht-kanzlei.php.
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Analysis
by VulDB Data Team • 09/21/2020
The vulnerability identified as CVE-2017-8110 represents a critical XML External Entity (XXE) flaw discovered in the modified eCommerce Shopsoftware version 2.0.2.2 revision 10690 produced by www.modified-shop.org. This vulnerability specifically affects the api/it-recht-kanzlei/api-it-recht-kanzlei.php endpoint, which processes XML data without proper input validation or sanitization mechanisms. The XXE vulnerability stems from the application's failure to properly handle external entity references within XML parsing operations, creating an avenue for malicious actors to exploit the system through crafted XML input.
The technical implementation of this vulnerability occurs when the web application receives XML data through the affected API endpoint and processes it using an XML parser that does not disable external entity resolution. Attackers can construct malicious XML payloads containing references to external resources or local files, enabling them to perform various malicious activities including data exfiltration, internal network reconnaissance, and potentially remote code execution depending on the server configuration. The vulnerability falls under CWE-611, which specifically addresses improper restriction of XML external entity reference, and aligns with ATT&CK technique T1213.002 for data from information repositories, as it allows unauthorized access to sensitive information through XML processing flaws.
The operational impact of this vulnerability extends beyond simple data theft, as it can enable attackers to perform server-side request forgery attacks and gain access to internal systems that would normally be protected by network segmentation. When exploited, the XXE vulnerability allows threat actors to read arbitrary files from the server filesystem, potentially accessing sensitive configuration files, database credentials, or other confidential information stored on the same server. The vulnerability is particularly concerning in e-commerce environments where the software may handle sensitive customer data, payment information, and business-critical operational data. Organizations using this specific version of modified eCommerce Shopsoftware are at risk of data breaches, regulatory compliance violations, and potential system compromise through this vector.
Mitigation strategies for CVE-2017-8110 should focus on immediate patching of the affected software to the latest available version that addresses the XXE vulnerability. System administrators should implement proper XML parser configuration to disable external entity resolution and DTD processing, ensuring that all XML input is validated and sanitized before processing. Network segmentation and firewall rules should be implemented to restrict access to the affected API endpoint, while comprehensive monitoring and logging should be enabled to detect potential exploitation attempts. Additionally, organizations should conduct thorough security assessments of their web applications to identify similar XXE vulnerabilities in other components, as the issue may not be isolated to this single endpoint. The vulnerability demonstrates the critical importance of input validation and secure coding practices in preventing XML-based attacks that can lead to significant security breaches in web applications.