CVE-2018-11586 in SearchBlox
Summary
by MITRE
XML external entity (XXE) vulnerability in api/rest/status in SearchBlox 8.6.7 allows remote unauthenticated users to read arbitrary files or conduct server-side request forgery (SSRF) attacks via a crafted DTD in an XML request.
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Analysis
by VulDB Data Team • 11/14/2024
The CVE-2018-11586 vulnerability represents a critical XML external entity processing flaw discovered in SearchBlox version 8.6.7 within its REST API endpoint at api/rest/status. This vulnerability falls under the category of CWE-611, which specifically addresses improper restriction of XML external entity reference processing. The flaw exists in how the application handles XML input processing, particularly when parsing XML requests containing maliciously crafted DTD (Document Type Definition) declarations. Attackers can exploit this vulnerability without requiring authentication credentials, making it particularly dangerous as it can be leveraged by any remote user with access to the targeted system.
The technical implementation of this vulnerability stems from the application's failure to properly validate and sanitize XML input received through the REST API interface. When a malicious XML request containing a crafted DTD is processed, the system's XML parser attempts to resolve external entities referenced within the DTD, leading to unauthorized file access or server-side request forgery operations. The vulnerability specifically targets the XML processing logic in the api/rest/status endpoint, which does not implement proper restrictions on external entity resolution. This flaw aligns with ATT&CK technique T1213.002 for data from other systems and T1566.001 for malicious file execution through XML external entity processing.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables attackers to perform server-side request forgery attacks that can potentially compromise entire network infrastructure. Remote attackers can leverage this vulnerability to access sensitive files on the server filesystem, including configuration files, database credentials, and system information that may reveal internal network topology. The SSRF capabilities allow adversaries to make requests to internal services that would normally be inaccessible from the outside, potentially enabling lateral movement within the network. This vulnerability can be particularly devastating in enterprise environments where SearchBlox systems may be integrated with critical infrastructure components.
Organizations should implement multiple layers of mitigation to address this vulnerability effectively. Immediate remediation requires updating to a patched version of SearchBlox that properly validates XML input and disables external entity resolution in XML parsers. System administrators should also implement network segmentation to limit access to the affected API endpoints and deploy web application firewalls that can detect and block malicious XML requests. Additional defensive measures include disabling XML external entity processing in all XML parsers, implementing strict input validation for all XML content, and monitoring network traffic for suspicious XML request patterns. The vulnerability demonstrates the importance of following secure coding practices and implementing proper XML processing controls as outlined in OWASP XML External Entity Prevention Cheat Sheet guidelines. Organizations should also conduct regular security assessments to identify similar vulnerabilities in other applications and ensure that XML processing components are properly configured to prevent unauthorized external entity resolution.