CVE-2022-28995 in Rengine
Summary
by MITRE • 05/20/2022
Rengine v1.0.2 was discovered to contain a remote code execution (RCE) vulnerability via the yaml configuration function.
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Analysis
by VulDB Data Team • 05/27/2022
The vulnerability identified as CVE-2022-28995 affects Rengine version 1.0.2 and represents a critical remote code execution flaw that can be exploited through the yaml configuration function. This vulnerability falls under the category of insecure deserialization as defined by CWE-502, where the application processes untrusted data without proper validation or sanitization. The issue stems from the application's handling of yaml input within its configuration processing module, creating an attack surface that allows malicious actors to inject arbitrary code that gets executed within the application's context. The flaw demonstrates a fundamental failure in input validation and data processing security controls that directly violates the principle of least privilege and secure coding practices.
The technical exploitation of this vulnerability occurs when an attacker can manipulate yaml configuration data that gets processed by the application's yaml parsing function. This creates a path for remote code execution where malicious payloads can be embedded within yaml structures and subsequently executed with the privileges of the application process. The vulnerability is particularly dangerous because yaml parsing libraries often have built-in capabilities for object instantiation and method execution that can be leveraged by attackers to perform arbitrary code operations. This type of vulnerability aligns with ATT&CK technique T1059.001 for command and scripting interpreter, where adversaries use legitimate system tools to execute malicious code through the yaml parsing mechanism.
From an operational impact perspective, successful exploitation of CVE-2022-28995 can result in complete system compromise, data exfiltration, and persistence mechanisms being established within the affected environment. The vulnerability affects any system running Rengine v1.0.2 that accepts yaml configuration inputs from untrusted sources, making it particularly dangerous in multi-tenant or cloud environments where configuration management is critical. Organizations using this software may face unauthorized access to sensitive data, system manipulation, and potential lateral movement within their network infrastructure. The vulnerability's remote nature means that attackers do not require physical access or local system credentials to exploit the flaw, significantly expanding the potential attack surface.
Security mitigations for CVE-2022-28995 should focus on immediate patching of affected Rengine installations to version 1.0.3 or later where the vulnerability has been addressed. Organizations should implement strict input validation controls for yaml configuration data, including sanitization of all user-supplied inputs and the implementation of whitelist-based validation for configuration parameters. Network segmentation and access controls should be strengthened to limit exposure of systems that process yaml configurations. Additionally, monitoring and logging should be enhanced to detect unusual yaml parsing activities or unexpected system behavior that might indicate exploitation attempts. The fix implemented by the vendor likely includes proper sanitization of yaml input, restriction of yaml deserialization capabilities, and implementation of secure configuration processing mechanisms that prevent arbitrary code execution during yaml parsing operations.