CVE-2023-35314 in Windows
Summary
by MITRE • 07/11/2023
Remote Procedure Call Runtime Denial of Service Vulnerability
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Analysis
by VulDB Data Team • 07/29/2023
This vulnerability resides within the Remote Procedure Call RPC runtime environment which forms a critical component of distributed computing systems enabling applications to execute code on remote machines seamlessly. The flaw manifests as a denial of service condition that can be triggered through malformed or specially crafted RPC requests that exploit weaknesses in the runtime processing mechanisms. When exploited, these vulnerabilities can cause the RPC runtime to crash or become unresponsive, effectively disrupting legitimate service operations and rendering critical systems inaccessible to authorized users.
The technical exploitation of this vulnerability typically involves sending malformed RPC messages that contain buffer overflows, integer underflows, or improper input validation handling within the RPC runtime libraries. These conditions often map to common software weaknesses such as those classified under CWE-121 which addresses buffer overflow conditions in stack-based memory allocations, or CWE-125 which covers out-of-bounds read vulnerabilities. The attack vectors leverage the fundamental RPC communication protocols that operate across network boundaries and utilize various transport mechanisms including TCP and UDP protocols.
The operational impact of such vulnerabilities extends beyond simple service disruption to encompass broader system availability concerns that can cascade through complex enterprise environments. Organizations relying on RPC-based services for critical infrastructure operations face potential business continuity risks when these vulnerabilities are exploited, particularly in scenarios involving mission-critical applications such as database services, directory services, or enterprise application servers. The vulnerability can be particularly dangerous in environments where RPC services are exposed to untrusted networks or where multiple systems depend on the availability of shared RPC resources.
Security professionals should implement layered mitigation strategies that include network segmentation to limit exposure of RPC services, regular patch management programs targeting known RPC vulnerabilities, and monitoring solutions capable of detecting anomalous RPC traffic patterns. The ATT&CK framework categorizes such vulnerabilities under the T1499 technique for network denial of service which includes methods targeting RPC and other remote service protocols. Organizations should also consider implementing intrusion detection systems specifically configured to identify RPC protocol anomalies and establish incident response procedures that address RPC-related denial of service scenarios.
The vulnerability assessment process must include comprehensive scanning of network infrastructure to identify exposed RPC services and their associated versions, followed by prioritized remediation efforts based on risk assessment criteria. Regular security testing including penetration testing exercises focused on RPC protocols helps validate the effectiveness of implemented controls. Additionally, implementing proper access controls through authentication mechanisms and secure RPC configuration practices reduces the attack surface available to potential exploiters while maintaining operational efficiency for legitimate system users.