CVE-2019-8703 – This vulnerability allows applications to gain ... (How to Fix)

Q: What is the severity of CVE-2019-8703?

CVE-2019-8703 has a CVSS score of 9.8 (CRITICAL). This vulnerability allows applications to gain elevated privileges through improper entitlements management in Apple operating systems. It affects users running vulnerable versions of iOS, macOS, tvOS, and watchOS. Successful exploitation could lead to unauthorized privilege escalation.

📋 TL;DR

This vulnerability allows applications to gain elevated privileges through improper entitlements management in Apple operating systems. It affects users running vulnerable versions of iOS, macOS, tvOS, and watchOS. Successful exploitation could lead to unauthorized privilege escalation.

💻 Affected Systems

Products:

iOS
macOS
tvOS
watchOS

Versions: Versions prior to iOS 13, macOS Catalina 10.15, tvOS 13, watchOS 6

Operating Systems: iOS, macOS, tvOS, watchOS

Default Config Vulnerable: ⚠️ Yes

Notes: All devices running affected versions are vulnerable by default. No special configuration required.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

An attacker could gain root-level access to the device, allowing complete system compromise, data theft, and persistent backdoor installation.

🟠

Likely Case

Malicious applications could bypass sandbox restrictions, access sensitive user data, and perform unauthorized actions with elevated privileges.

🟢

If Mitigated

With proper application vetting and security controls, risk is limited to applications that have already passed through security review processes.

🌐 Internet-Facing: LOW - This vulnerability requires local application execution rather than remote network exploitation.

🏢 Internal Only: HIGH - Malicious or compromised applications running on affected devices could exploit this vulnerability locally.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires a malicious application to be installed and executed on the target device. No public exploit code is known.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: iOS 13, macOS Catalina 10.15, tvOS 13, watchOS 6

Vendor Advisory: https://support.apple.com/en-us/HT210604

Restart Required: Yes

Instructions:

1. Open Settings/System Preferences 2. Navigate to Software Update 3. Download and install the latest OS update 4. Restart the device when prompted

🔧 Temporary Workarounds

Application Restriction

all

Restrict installation of untrusted applications through MDM or parental controls

🧯 If You Can't Patch

Implement strict application whitelisting policies
Use mobile device management (MDM) to control application installation

🔍 How to Verify

Check if Vulnerable:

Check OS version in Settings > General > About (iOS) or About This Mac (macOS)

Check Version:

sw_vers (macOS) or Settings > General > About > Version (iOS)

Verify Fix Applied:

Verify OS version is iOS 13+, macOS 10.15+, tvOS 13+, or watchOS 6+

📡 Detection & Monitoring

Log Indicators:

Unexpected privilege escalation events
Application sandbox violations

Network Indicators:

None - this is a local privilege escalation vulnerability

SIEM Query:

Search for process elevation events from non-system applications

📊 Metadata

CVE ID: CVE-2019-8703

CVSS v3 Score: 9.8 (CRITICAL)

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

Published: December 23, 2021

Last Updated: November 21, 2024

🔗 References

https://support.apple.com/en-us/HT210604 Vendor Advisory
https://support.apple.com/en-us/HT210606 Vendor Advisory
https://support.apple.com/en-us/HT210607 Vendor Advisory
https://support.apple.com/en-us/HT210634 Vendor Advisory
https://support.apple.com/en-us/HT210604 Vendor Advisory
https://support.apple.com/en-us/HT210606 Vendor Advisory
https://support.apple.com/en-us/HT210607 Vendor Advisory
https://support.apple.com/en-us/HT210634 Vendor Advisory

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