CVE-2020-8541 in OX App Suite
Summary
by MITRE
OX App Suite through 7.10.3 allows XXE attacks.
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Analysis
by VulDB Data Team • 06/17/2020
The vulnerability CVE-2020-8541 represents a critical XML External Entity processing flaw discovered in OX App Suite versions up to 7.10.3. This vulnerability falls under the category of insecure deserialization and improper input validation, specifically enabling attackers to perform XML External Entity attacks that can lead to unauthorized data access and system compromise. The issue stems from the application's insufficient validation of XML input processing, allowing malicious actors to inject external entity references that can be exploited to access local files, perform server-side request forgery attacks, or conduct internal network reconnaissance.
The technical exploitation of this vulnerability occurs when the application processes XML data without proper sanitization of external entity declarations. Attackers can craft malicious XML payloads that reference external resources or local files, causing the application to retrieve and process these entities during XML parsing operations. This flaw exists in the XML processing libraries used by OX App Suite, specifically in how the application handles XML data submitted through various interfaces including web forms, API endpoints, and file upload mechanisms. The vulnerability is particularly dangerous because it can be leveraged to read sensitive files from the server filesystem, access internal network services, or even escalate privileges within the application environment.
The operational impact of CVE-2020-8541 extends beyond simple data theft, as it provides attackers with potential pathways for further system compromise and lateral movement within network environments. Successful exploitation could lead to unauthorized access to user credentials, personal information, and business data stored within the application. The vulnerability affects organizations using OX App Suite in enterprise environments where sensitive corporate data is processed, potentially exposing critical business information to unauthorized parties. Additionally, the attack surface includes potential for denial of service conditions if attackers can cause the application to consume excessive system resources through malformed XML entities.
Security mitigations for this vulnerability should include immediate patching of OX App Suite to versions 7.10.4 or later where the XXE processing has been properly addressed. Organizations should implement comprehensive input validation and sanitization measures for all XML data processing within their applications, ensuring that external entity declarations are properly disabled or restricted. Network segmentation and monitoring solutions should be deployed to detect anomalous XML processing activities that may indicate exploitation attempts. The vulnerability aligns with CWE-611 (Improper Restriction of XML External Entity Reference) and maps to ATT&CK techniques including T1071.004 (Application Layer Protocol: DNS) and T1566.001 (Phishing: Spearphishing Attachment) as attackers may use this vulnerability to exfiltrate data or deliver additional payloads through compromised XML processing endpoints.
Organizations should conduct thorough vulnerability assessments to identify all systems running affected versions of OX App Suite and ensure proper configuration of XML parsers to disable external entity processing. Regular security testing including XML injection testing should be incorporated into the application security testing regimen. The fix implemented by OX App Suite developers addresses the root cause by implementing proper XML parser configurations that prevent external entity resolution, aligning with industry best practices for preventing XXE attacks and ensuring secure XML processing in enterprise applications.