CVE-2021-27618 in Process Integration
Summary
by MITRE • 05/11/2021
The Integration Builder Framework of SAP Process Integration versions - 7.10, 7.11, 7.20, 7.30, 7.31, 7.40, 7.50, does not check the file type extension of the file uploaded from local source. An attacker could craft a malicious file and upload it to the application, which could lead to denial of service and impact the availability of the application.
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Analysis
by VulDB Data Team • 05/15/2021
The vulnerability identified as CVE-2021-27618 affects SAP Process Integration systems running specific versions including 7.10 through 7.50, where the Integration Builder Framework fails to validate file type extensions during local file uploads. This represents a critical security flaw that directly violates fundamental principles of input validation and secure coding practices. The absence of proper file extension checking creates an exploitable condition where malicious actors can upload arbitrary file types without restriction, potentially leading to system compromise and service disruption.
This vulnerability falls under the category of insecure file upload mechanisms, which aligns with CWE-434 and CWE-502, as it allows unauthorized file execution and manipulation within the application environment. The technical flaw manifests in the lack of proper file validation routines that should verify file extensions against a whitelist of allowed types before processing. Attackers can exploit this weakness by crafting malicious files with extensions that bypass the system's validation checks, potentially uploading executable code or malicious scripts that can be executed within the application context.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it can enable more sophisticated attack vectors including remote code execution and persistent system compromise. When an attacker successfully uploads malicious files, they can potentially disrupt business processes, access sensitive data, or establish persistent access points within the SAP environment. The availability impact is particularly concerning as the system may become unresponsive or crash entirely when processing malicious uploads, leading to business disruption and potential financial losses.
Organizations should implement immediate mitigations including restricting file upload capabilities to authenticated users only, implementing strict file type validation with comprehensive whitelisting, and deploying additional security controls such as web application firewalls to monitor and block suspicious upload attempts. The ATT&CK framework categorizes this vulnerability under T1190 - Exploit Public-Facing Application, and T1059 - Command and Scripting Interpreter, highlighting the multi-stage attack approach possible through this flaw. System administrators should also consider implementing automated monitoring solutions to detect anomalous file upload patterns and ensure regular security updates are applied to all SAP components to prevent exploitation of this and similar vulnerabilities.