CVE-2017-15725 in AnswerHub
Summary
by MITRE
An XML External Entity Injection vulnerability exists in Dzone AnswerHub.
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Analysis
by VulDB Data Team • 01/29/2024
The CVE-2017-15725 vulnerability represents a critical XML External Entity Injection flaw within the Dzone AnswerHub platform, a community-driven question and answer system widely used by software development teams and technical professionals. This vulnerability falls under the Common Weakness Enumeration category CWE-611, which specifically addresses XML External Entity Injection vulnerabilities that occur when an application processes untrusted XML data without proper validation or sanitization. The flaw enables attackers to manipulate the XML parsing behavior of the application by introducing external entity references that can be exploited to access internal resources or execute malicious code.
The technical implementation of this vulnerability stems from AnswerHub's insufficient input validation mechanisms when processing XML data submitted through various interfaces including API endpoints and data import functionalities. When the application receives XML content containing external entity declarations, it fails to properly restrict or sanitize these references, allowing attackers to craft malicious XML payloads that can trigger unintended behavior. The vulnerability is particularly concerning because it can be exploited through multiple vectors including user-generated content submission, data import operations, and API calls that accept XML-formatted input, making it accessible to both authenticated and unauthenticated attackers depending on the specific implementation details.
The operational impact of this vulnerability extends beyond simple data exfiltration to encompass potential system compromise and unauthorized access to sensitive information. Attackers can leverage this flaw to perform server-side request forgery attacks, gain access to internal network resources, or even execute arbitrary code on the affected system. The vulnerability may enable attackers to access database credentials, application configuration files, or other sensitive data stored within the system's internal infrastructure. Additionally, the exploitation can lead to denial of service conditions by consuming excessive system resources through malformed XML entities or potentially allow for privilege escalation if the application processes XML data with elevated permissions.
Security practitioners should implement multiple layers of mitigation strategies to address this vulnerability effectively. The primary defense mechanism involves disabling external entity resolution in all XML parsers used by the AnswerHub application through proper configuration settings that prevent the processing of external references. Input validation and sanitization should be implemented at all entry points where XML data is accepted, ensuring that any external entity declarations are properly filtered or removed before processing. Network segmentation and access controls should be enforced to limit the potential impact of successful exploitation attempts, while regular security updates and patches should be applied to ensure the application remains protected against known vulnerabilities. Organizations should also consider implementing web application firewalls and monitoring systems to detect and prevent suspicious XML processing activities that may indicate exploitation attempts. The vulnerability aligns with ATT&CK technique T1059.007 for XML external entity injection and represents a significant risk to organizations relying on AnswerHub for knowledge management and community collaboration, particularly in environments where sensitive technical information is shared and stored.