CVE-2023-33164 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 • 07/28/2023
This vulnerability affects the Remote Procedure Call runtime environment where malicious actors can exploit flaws in the communication protocols to disrupt service availability. The issue manifests when the RPC runtime fails to properly handle malformed or specially crafted input data during procedure execution, leading to system crashes or resource exhaustion that prevents legitimate operations from completing successfully.
The technical root cause stems from inadequate input validation mechanisms within the RPC implementation where buffer overflows, integer underflows, or improper state management can occur when processing remote calls. Attackers typically craft malicious RPC requests containing oversized data structures, malformed headers, or recursive call sequences that overwhelm system resources or trigger unexpected execution paths within the runtime environment. This category of vulnerability aligns with CWE-121 and CWE-122 which address stack and heap based buffer overflows, while also relating to CWE-400 which covers resource exhaustion conditions.
The operational impact of such vulnerabilities extends beyond simple service disruption to potentially compromise entire network infrastructure when critical systems rely on RPC for inter-process communication. Organizations may experience cascading failures as dependent services become unavailable, leading to extended downtime and potential data loss. The vulnerability can be exploited remotely without requiring authentication, making it particularly dangerous in enterprise environments where RPC services are commonly exposed to untrusted networks.
Mitigation strategies should focus on implementing comprehensive input validation at multiple layers of the communication stack including network level filtering, application level sanitization, and runtime monitoring for anomalous behavior patterns. Organizations should deploy intrusion detection systems capable of identifying suspicious RPC traffic patterns and implement principle of least privilege controls to limit exposure of RPC services. Regular patch management and system hardening procedures are essential while also considering network segmentation approaches to isolate critical RPC endpoints from general network access.
This vulnerability type relates to ATT&CK technique T1499 which covers network denial of service attacks, specifically targeting the availability aspect of the CIA triad. The attack surface is particularly concerning in distributed systems where RPC serves as a foundation for enterprise communication protocols such as DCOM and Microsoft RPC implementations that are widely used across corporate networks. Security teams must prioritize monitoring for unusual resource consumption patterns and implement automated response mechanisms that can detect and isolate affected RPC services during exploitation attempts.
The remediation approach requires systematic review of all RPC interfaces to identify potential attack vectors, followed by implementation of proper error handling and defensive programming practices. Code reviews should specifically target areas where RPC calls are made with untrusted data sources, while also ensuring that system administrators maintain updated knowledge of security patches for underlying RPC implementations. Regular vulnerability assessments focusing on inter-process communication mechanisms help identify similar weaknesses in related components that might present additional attack surfaces requiring attention.
Organizations experiencing this vulnerability must consider both immediate response measures including service isolation and monitoring activation alongside long-term architectural improvements such as implementing circuit breakers, rate limiting, and redundant communication pathways to maintain system resilience against similar attacks. The complexity of modern enterprise networks means that RPC-based denial of service attacks can propagate rapidly through interconnected systems, making comprehensive defense-in-depth strategies essential for maintaining operational continuity.