CVE-2021-30985
📋 TL;DR
This vulnerability allows malicious iOS/iPadOS applications to write data beyond allocated memory boundaries, potentially leading to arbitrary code execution with kernel privileges. It affects Apple iOS and iPadOS devices running versions before 15.2. Users who haven't updated their devices are vulnerable to exploitation.
💻 Affected Systems
- iPhone
- iPad
📦 What is this software?
Ipados by Apple
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent malware, access all user data, and control device functions at the kernel level.
Likely Case
Malicious apps from unofficial sources could gain elevated privileges to steal sensitive data, monitor user activity, or install additional payloads.
If Mitigated
With proper app store restrictions and device management, exploitation would require bypassing Apple's app review process or convincing users to install malicious enterprise-signed apps.
🎯 Exploit Status
Exploitation requires user to install and run a malicious application. Apple's sandboxing and code signing provide some protection layers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: iOS 15.2 and iPadOS 15.2
Vendor Advisory: https://support.apple.com/en-us/HT212976
Restart Required: Yes
Instructions:
1. Open Settings app. 2. Tap General. 3. Tap Software Update. 4. Download and install iOS 15.2 or later. 5. Device will restart automatically.
🔧 Temporary Workarounds
Restrict App Sources
allOnly install apps from official App Store to reduce risk of malicious applications.
Disable Enterprise App Installation
allFor enterprise devices, restrict installation of enterprise-signed apps to trusted sources only.
🧯 If You Can't Patch
- Implement strict mobile device management (MDM) policies to control app installation
- Isolate vulnerable devices from sensitive networks and data
🔍 How to Verify
Check if Vulnerable:
Check iOS/iPadOS version in Settings > General > About > Version. If version is earlier than 15.2, device is vulnerable.Check Version:
Not applicable - check via device Settings interfaceVerify Fix Applied:
After updating, verify version shows 15.2 or later in Settings > General > About > Version.📡 Detection & Monitoring
Log Indicators:
- MDM logs showing unauthorized app installations
- System logs showing kernel panic or unexpected reboots
Network Indicators:
- Unusual network connections from iOS devices
- Traffic to known malicious domains from iOS apps
SIEM Query:
device.os.name:"iOS" AND device.os.version:"<15.2" AND event.action:"app_install"