CVE-2024-30097: Windows 10 1507 SAPI RCE Vulnerability

CVE-2024-30097 Overview

CVE-2024-30097 is a Remote Code Execution vulnerability affecting the Microsoft Speech Application Programming Interface (SAPI). This vulnerability allows attackers to execute arbitrary code on affected Windows systems by exploiting a Double Free memory corruption flaw (CWE-415) in the SAPI component. Successful exploitation requires user interaction but can be triggered remotely over the network, making it a significant threat to enterprise environments.

Critical Impact

Successful exploitation of this vulnerability allows attackers to execute arbitrary code with the privileges of the targeted user, potentially leading to complete system compromise, data theft, or lateral movement within the network.

Affected Products

• Microsoft Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2)
• Microsoft Windows 11 (versions 21H2, 22H2, 23H2)
• Microsoft Windows Server 2016, 2019, 2022, and 2022 23H2

Discovery Timeline

• June 11, 2024 - CVE-2024-30097 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2024-30097

Vulnerability Analysis

This vulnerability stems from a Double Free condition (CWE-415) in the Microsoft Speech Application Programming Interface (SAPI). A Double Free vulnerability occurs when a program attempts to free the same memory location twice, which can corrupt the memory management data structures and lead to unpredictable behavior.

In the context of SAPI, this flaw exists in how the API handles memory allocation and deallocation during speech processing operations. When specially crafted input is processed by the vulnerable component, the improper memory management can be exploited to gain code execution capabilities.

The vulnerability is exploitable remotely over the network but requires user interaction to trigger. An attacker would need to convince a user to open a malicious file or visit a compromised website that invokes the vulnerable SAPI functionality. Once triggered, the attacker can execute code in the context of the current user, potentially gaining full control of the affected system.

Root Cause

The root cause is a Double Free memory corruption flaw in the Microsoft Speech Application Programming Interface. The vulnerability arises from improper memory management where the same memory block is freed multiple times during speech processing operations. This memory corruption can be leveraged by attackers to overwrite critical memory structures and redirect program execution flow.

Attack Vector

The attack vector for CVE-2024-30097 is network-based with user interaction required. An attacker could exploit this vulnerability through several methods:

1. Malicious Web Content: Crafting a web page that triggers the vulnerable SAPI component through embedded audio or speech-related content
2. Malicious Documents: Creating specially crafted documents that invoke SAPI functionality when opened
3. Phishing Campaigns: Distributing malicious files via email that exploit the vulnerability when the user interacts with them

The attacker does not require prior authentication to the target system, but must successfully convince the user to perform an action that triggers the vulnerability. Once exploited, the attacker achieves code execution with the same privileges as the targeted user account.

Detection Methods for CVE-2024-30097

Indicators of Compromise

• Unexpected crashes or errors in applications utilizing the Speech API (sapi.dll)
• Anomalous memory access patterns associated with speech processing components
• Suspicious network connections originating from processes that interact with SAPI
• Unusual child process creation from speech-related Windows services

Detection Strategies

• Monitor for abnormal behavior in processes that load sapi.dll or related speech processing modules
• Implement endpoint detection rules to identify Double Free exploitation patterns and memory corruption attempts
• Deploy network monitoring to detect suspicious payloads targeting Windows systems via web traffic
• Utilize behavioral analysis to detect post-exploitation activities following SAPI-related crashes

Monitoring Recommendations

• Enable Windows Event Log monitoring for Application Error events related to speech components
• Configure SentinelOne agents to alert on suspicious memory operations in SAPI-related processes
• Implement network traffic analysis to identify potential exploit delivery attempts
• Establish baseline behavior for speech API usage and alert on deviations

How to Mitigate CVE-2024-30097

Immediate Actions Required

• Apply the Microsoft security update for CVE-2024-30097 immediately on all affected systems
• Prioritize patching systems with internet exposure or those used for web browsing
• Restrict user permissions to limit the impact of potential exploitation
• Enable SentinelOne's exploit protection capabilities to detect and block exploitation attempts

Patch Information

Microsoft has released security updates to address this vulnerability. Detailed patch information and affected platform-specific updates are available in the Microsoft Security Update Guide for CVE-2024-30097. Organizations should deploy patches through Windows Update, WSUS, or Microsoft Endpoint Configuration Manager based on their patch management processes.

Workarounds

• Implement strict web filtering policies to block access to potentially malicious websites
• Configure email security gateways to scan and quarantine suspicious attachments
• Educate users about phishing risks and the importance of not opening unexpected files
• Consider disabling or restricting SAPI functionality on systems where speech features are not required

# Verify patch status on Windows systems
wmic qfe list brief /format:table | findstr /i "KB"
# Check for SAPI-related services and their status
sc query | findstr /i "speech"