CVE-2022-24528: Windows 10 RPC Runtime RCE Vulnerability

CVE-2022-24528 Overview

CVE-2022-24528 is a Remote Code Execution vulnerability affecting the Remote Procedure Call (RPC) Runtime component in Microsoft Windows operating systems. This vulnerability allows attackers to execute arbitrary code on affected systems by exploiting weaknesses in how the RPC Runtime handles certain requests. The vulnerability requires user interaction, meaning an attacker would need to convince a user to trigger the malicious payload, but successful exploitation can result in complete system compromise.

Critical Impact
Successful exploitation of this vulnerability enables remote code execution with the potential for full system compromise, allowing attackers to gain complete control over affected Windows systems with high impact to confidentiality, integrity, and availability.

Affected Products

Microsoft Windows 10 (multiple versions including 1607, 1809, 1909, 20H2, 21H1, 21H2)
Microsoft Windows 11 (ARM64 and x64 architectures)
Microsoft Windows 7 SP1
Microsoft Windows 8.1 and Windows RT 8.1
Microsoft Windows Server 2008 SP2 and R2 SP1
Microsoft Windows Server 2012 and R2
Microsoft Windows Server 2016 (including 20H2)
Microsoft Windows Server 2019
Microsoft Windows Server 2022

Discovery Timeline

April 15, 2022 - CVE-2022-24528 published to NVD
November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2022-24528

Vulnerability Analysis

The Remote Procedure Call (RPC) Runtime is a critical Windows component that enables inter-process communication across network boundaries. This vulnerability exists within the RPC Runtime's handling of specially crafted requests, which can lead to memory corruption or improper execution flow, ultimately allowing an attacker to execute arbitrary code in the context of the affected process.

The vulnerability is classified as a Remote Code Execution (RCE) issue. The attack requires network access to the target system and relies on user interaction to trigger the exploit. Once successfully exploited, an attacker could gain the same privileges as the current user, potentially leading to full system compromise if the user has administrative rights.

The EPSS score of 4.978% places this vulnerability in the 89.43rd percentile, indicating a higher-than-average probability of exploitation compared to other vulnerabilities.

Root Cause

The root cause of this vulnerability relates to improper handling within the RPC Runtime component. While Microsoft has not disclosed specific technical details about the underlying flaw (classified as NVD-CWE-noinfo), the vulnerability appears to stem from how the RPC Runtime processes certain types of requests or data, leading to a condition where remote code execution becomes possible.

Attack Vector

The attack vector for CVE-2022-24528 is network-based and requires user interaction. An attacker would typically:

Craft a malicious RPC request or payload designed to exploit the vulnerability
Deliver the payload to a target user through social engineering techniques
Convince the user to interact with or trigger the malicious content
Upon user interaction, the exploit executes, allowing arbitrary code execution on the target system

The vulnerability can be exploited remotely without requiring prior authentication or elevated privileges on the target system.

Detection Methods for CVE-2022-24528

Indicators of Compromise

Unusual network traffic patterns involving RPC communications on ports 135, 593, or dynamic RPC ports
Unexpected process creation or code execution originating from RPC-related system components
Anomalous behavior in rpcss.dll or related RPC Runtime processes
Suspicious outbound connections following RPC communication events

Detection Strategies

Monitor Windows Event Logs for unusual RPC-related events, particularly those indicating failed or anomalous RPC operations
Implement network intrusion detection rules to identify malformed or suspicious RPC traffic
Deploy endpoint detection and response (EDR) solutions capable of detecting memory corruption exploitation techniques
Review process creation events for unexpected child processes spawned by RPC-handling services

Monitoring Recommendations

Enable detailed audit logging for RPC operations and Windows system events
Configure alerting for unusual process behavior associated with Windows networking components
Utilize SentinelOne's behavioral AI detection capabilities to identify exploitation attempts targeting Windows system components
Implement network segmentation and monitor cross-segment RPC traffic for anomalies

How to Mitigate CVE-2022-24528

Immediate Actions Required

Apply the Microsoft security update for CVE-2022-24528 immediately on all affected Windows systems
Prioritize patching of internet-facing and critical infrastructure systems
Review user access privileges and implement least-privilege principles to limit potential impact
Educate users about social engineering risks since the vulnerability requires user interaction

Patch Information

Microsoft has released security updates to address this vulnerability. Organizations should obtain the appropriate patch from the Microsoft Security Update Guide for CVE-2022-24528. Apply updates through Windows Update, Windows Server Update Services (WSUS), or Microsoft Update Catalog based on your organization's patch management strategy.

Workarounds

Restrict RPC traffic at network boundaries using firewall rules to limit exposure
Implement network segmentation to isolate critical systems from potential attack vectors
Consider blocking or limiting inbound RPC communications from untrusted networks
Use host-based firewall rules to restrict RPC port access (ports 135, 593, and dynamic RPC ports) to authorized systems only

bash

# Windows Firewall configuration to restrict RPC access
netsh advfirewall firewall add rule name="Block External RPC" dir=in action=block protocol=tcp localport=135
netsh advfirewall firewall add rule name="Block External RPC HTTPS" dir=in action=block protocol=tcp localport=593