CVE-2020-6305 in Process Integration
Summary
by MITRE
PI Rest Adapter of SAP Process Integration (update provided in SAP_XIAF 7.31, 7.40, 7.50) does not sufficiently encode user-controlled inputs, resulting in Cross-Site Scripting (XSS) vulnerability.
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Analysis
by VulDB Data Team • 03/21/2024
The CVE-2020-6305 vulnerability resides within the PI Rest Adapter component of SAP Process Integration systems, specifically affecting versions 7.31, 7.40, and 7.50 as noted in the SAP_XIAF update. This security flaw represents a critical cross-site scripting vulnerability that emerges from inadequate input validation and encoding mechanisms within the REST adapter functionality. The vulnerability manifests when user-controlled data is processed through the adapter without proper sanitization, creating an attack surface that can be exploited by malicious actors to inject malicious scripts into web applications.
The technical implementation of this vulnerability stems from insufficient output encoding practices within the PI Rest Adapter's data handling procedures. When user inputs are passed through the REST interface without appropriate HTML entity encoding or other sanitization measures, the system fails to distinguish between legitimate content and potentially harmful script code. This weakness allows attackers to craft malicious payloads that can execute within the context of a victim's browser session, particularly when the system displays user-supplied data in web interfaces or generates dynamic content based on REST API responses. The vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications where insufficient input validation allows malicious scripts to be executed.
The operational impact of CVE-2020-6305 extends beyond simple script injection, as it can enable attackers to perform various malicious activities including session hijacking, data exfiltration, and privilege escalation within the affected system. An attacker could exploit this vulnerability to steal user credentials, access sensitive business data, or manipulate system functionality through the compromised REST adapter interface. The attack vector typically involves sending crafted payloads through REST API calls that contain malicious script code, which then gets executed when the system renders the data in web browsers or displays it in administrative interfaces. This vulnerability particularly affects organizations using SAP Process Integration for enterprise application integration, where REST adapters handle sensitive data exchanges between different systems.
Mitigation strategies for this vulnerability require immediate implementation of the SAP_XIAF updates mentioned in the advisory, which provide necessary patches to address the encoding deficiencies in the PI Rest Adapter. Organizations should also implement comprehensive input validation mechanisms that enforce strict sanitization of all user-controlled data before processing, particularly focusing on REST API endpoints that handle dynamic content generation. Network segmentation and web application firewalls can provide additional layers of protection by monitoring and filtering suspicious REST API traffic. Security teams should conduct thorough code reviews of all REST adapter implementations and establish proper output encoding practices that align with OWASP secure coding guidelines. The vulnerability also highlights the importance of implementing the principle of least privilege for REST adapter configurations and regular security assessments to identify similar encoding weaknesses in other system components. This issue demonstrates the critical need for robust input/output encoding practices in enterprise integration platforms and aligns with ATT&CK technique T1059.005 for command and scripting interpreter usage through web application vulnerabilities.