CVE-2019-8784 – CVE-2019-8784 is a memory corruption vulnerabil... (How to Fix)

Q: What is the severity of CVE-2019-8784?

CVE-2019-8784 has a CVSS score of 7.8 (HIGH). CVE-2019-8784 is a memory corruption vulnerability in multiple Apple products that allows an application to execute arbitrary code with system privileges. This affects iOS, iPadOS, macOS, iTunes for Windows, and iCloud for Windows. Successful exploitation could lead to complete system compromise.

📋 TL;DR

CVE-2019-8784 is a memory corruption vulnerability in multiple Apple products that allows an application to execute arbitrary code with system privileges. This affects iOS, iPadOS, macOS, iTunes for Windows, and iCloud for Windows. Successful exploitation could lead to complete system compromise.

💻 Affected Systems

Products:

iOS
iPadOS
macOS
iTunes for Windows
iCloud for Windows

Versions: Versions prior to iOS 13.2, iPadOS 13.2, macOS Catalina 10.15.1, iTunes for Windows 12.10.2, iCloud for Windows 11.0, iCloud for Windows 7.15

Operating Systems: iOS, iPadOS, macOS, Windows

Default Config Vulnerable: ⚠️ Yes

Notes: All default configurations of affected versions are vulnerable. No special configuration required for exploitation.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Full system compromise with attacker gaining SYSTEM/root privileges, enabling installation of persistent malware, data theft, and complete control over affected devices.

🟠

Likely Case

Privilege escalation from a lower-privileged application to SYSTEM/root access, potentially leading to credential theft, lateral movement, or ransomware deployment.

🟢

If Mitigated

Limited impact if systems are fully patched, isolated, or have application control preventing unauthorized code execution.

🌐 Internet-Facing: MEDIUM - Requires user interaction (running malicious application) but could be delivered via phishing or compromised websites.

🏢 Internal Only: MEDIUM - Internal users could exploit via malicious applications, but requires initial access to the system.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires the attacker to get a malicious application running on the target system. No public exploit code is known.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: iOS 13.2, iPadOS 13.2, macOS Catalina 10.15.1, iTunes for Windows 12.10.2, iCloud for Windows 11.0, iCloud for Windows 7.15

Vendor Advisory: https://support.apple.com/HT210721

Restart Required: Yes

Instructions:

1. Open Settings/System Preferences. 2. Navigate to Software Update. 3. Install the latest available update. 4. Restart the device when prompted.

🔧 Temporary Workarounds

Application Control

all

Restrict execution of unauthorized applications to prevent malicious code from running.

Network Segmentation

all

Isolate affected systems from critical network segments to limit lateral movement.

🧯 If You Can't Patch

Implement strict application whitelisting to prevent unauthorized code execution.
Isolate affected systems in a restricted network segment with minimal access privileges.

🔍 How to Verify

Check if Vulnerable:

Check the current version of the software against the patched versions listed in the affected systems section.

Check Version:

iOS/iPadOS: Settings > General > About > Version. macOS: Apple menu > About This Mac. Windows: For iTunes/iCloud, open the application and check Help > About.

Verify Fix Applied:

Verify the installed version matches or exceeds the patched version numbers provided in the fix section.

📡 Detection & Monitoring

Log Indicators:

Unexpected process execution with SYSTEM/root privileges
Memory access violations or corruption events in system logs

Network Indicators:

Unusual outbound connections from system processes
Beaconing behavior from privileged processes

SIEM Query:

Process creation events where parent process is unexpected or user context is SYSTEM/root on unpatched Apple systems

📊 Metadata

CVE ID: CVE-2019-8784

CVSS v3 Score: 7.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE: CWE-787

Published: December 18, 2019

Last Updated: November 21, 2024

🔗 References

https://support.apple.com/HT210721 Vendor Advisory
https://support.apple.com/HT210722 Vendor Advisory
https://support.apple.com/HT210726 Vendor Advisory
https://support.apple.com/HT210727 Vendor Advisory
https://support.apple.com/HT210728 Vendor Advisory
https://support.apple.com/HT210721 Vendor Advisory
https://support.apple.com/HT210722 Vendor Advisory
https://support.apple.com/HT210726 Vendor Advisory
https://support.apple.com/HT210727 Vendor Advisory
https://support.apple.com/HT210728 Vendor Advisory

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🔗 Related Vulnerabilities

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