Apple Fixed cve-2023-42824 Issue With iOS 17.0.3

Apple has released Apple Fixed cve-2023-42824 Issue With iOS 17.0.3 to address a high severity kernel vulnerability that could allow an attacker to escalate privileges on iPhones and iPads. This vulnerability, tracked as CVE-2023-42824, was being actively exploited in the wild, making it critical for users to update as soon as possible.

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Overview of the Vulnerability

CVE-2023-42824 is a flaw in the iOS kernel that could enable a local attacker to gain root privileges on the device. To exploit this vulnerability, the attacker would need physical access to the target device in order to run malicious code. If successfully exploited, the attacker could then gain full control over the device, accessing sensitive data and completely compromising the user’s privacy and security.

The vulnerability was discovered and reported to Apple by an anonymous researcher earlier this year. Apple has confirmed that the flaw was being actively exploited at the time of discovery, though the exploit campaign is believed to be limited in scope. Nonetheless, due to the serious implications of a successful exploit, Apple treated this as a critical issue and fast-tracked the release of Apple Fixed cve-2023-42824 Issue With iOS 17.0.3to address it.

Technical Details of the Flaw

While Apple has not released the full technical details of CVE-2023-42824, the company has indicated it is a memory corruption issue within the iOS kernel. Specifically, the vulnerability exists within the kernel extensions that handle I/O Kit API calls from user space apps. By manipulating these API calls, an attacker could potentially trigger a buffer overflow, leading to memory corruption.

Through this memory corruption bug, the attacker gains the ability to write arbitrary data to the kernel memory space. This then could enable privilege escalation, bypassing iOS security protections and sandboxing mechanisms. With root privileges attained, the attacker has full access to the iOS file system and inter-process mechanisms.

The specific conditions required to trigger the flaw are currently unknown outside of Apple. But given the nature of kernel vulnerabilities, specialized expertise would be required to develop a working exploit. This suggests the flaw was exploited in a limited manner by advanced hackers as opposed to mass exploitation.

iOS 17.0.3 Update Patches the Issue

To protect users from this critical kernel vulnerability, Apple has released iOS 17.0.3 for all compatible iPhone and iPad models. The update is available immediately over-the-air through the Settings app. Users are highly advised to install the 17.0.3 update right away to ensure their device is protected.

iOS 17.0.3 patches CVE-2023-42824 through improved checks and memory handling within the I/O Kit API kernel extensions. The update also enhances other kernel integrity protections to prevent against possible related exploitation avenues. With the 17.0.3 patch applied, the flaw is fully resolved and can no longer be leveraged by attackers.

For the best protection, users should install iOS 17.0.3 as soon as possible. The update can be initiated manually via Settings > General > Software Update. You should also make sure you are running the latest versions of your apps from the App Store, as developer updates may include their own patches for related vulnerabilities.

Additional Fix in iOS 17.0.3: Thermal Management

In addition to patching the critical kernel flaw, iOS 17.0.3 also resolves an issue that was causing some iPhone models to become warmer than expected during use.

Reports indicated that iPhone 14 Pro and iPhone 14 Pro Max devices would get noticeably warm when performing graphically intensive tasks, such as prolonged gaming. While not severe enough to be dangerous, the warmth could make the devices uncomfortable to hold during extended heavy use.

Apple determined the unexpected thermal increase was due to a bug in power management. The CPU and GPU were not properly balancing workload between performance cores and efficiency cores when handling graphically intensive apps.

iOS 17.0.3 fixes this issue by improving workload distribution across CPU cores. With the update installed, iPhone 14 Pro models should now maintain better thermal performance during intensive gaming or augmented reality sessions. Users should no longer experience uncomfortably warm devices under expected workloads.

Who is Affected by These Issues?

The CVE-2023-42824 kernel vulnerability impacts any iPhone or iPad model running a vulnerable version of iOS:

  • iPhone 8 and later
  • iPad Pro (all models)
  • iPad Air 3rd generation and later
  • iPad 5th generation and later
  • iPad mini 5th generation and later

Essentially any Apple mobile device capable of running iOS 15 or later could be affected. The flaw has been addressed for all compatible models with the iOS 17.0.3 update.

The thermal management issue is specifically isolated to the iPhone 14 Pro and iPhone 14 Pro Max models. No other iPhone or iPad models exhibited the excess warmth bug. The overheating is fully resolved in iOS 17.0.3 for the Pro models.

How to Check Your iOS Version

To verify your current iOS version and see if you need to update, follow these steps:

  1. Open the Settings app on your iPhone or iPad.
  2. Navigate to General > Software Update.
  3. Look at the number next to “iOS” – this shows your current major and minor iOS version.

If you are running any version below iOS 17.0.3, you should install the latest update immediately to get the fix for CVE-2023-42824.

You can also check your iOS version from the Home screen by going to Settings > General > About and looking at the number beside “Software Version”.

Install the iOS 17.0.3 Update

Installing the iOS 17.0.3 update only takes a few minutes and requires minimal effort.

Follow these steps:

  1. Make sure your iPhone or iPad is connected to WiFi and plugged into power.
  2. Open the Settings app.
  3. Tap General, then tap Software Update.
  4. The iOS 17.0.3 update should be listed. Tap “Download and Install”.
  5. Enter your passcode if prompted.
  6. Agree to the Terms and Conditions.
  7. Let the update process complete. Your device will restart automatically.

Once your device reboots, you will be running iOS 17.0.3 with the critical kernel flaw patched. Repeat the process on all of your eligible iPhones and iPads to ensure they are fully protected from this vulnerability.

Frequently Asked Questions

Here are answers to some common questions about the CVE-2023-42824 vulnerability and the iOS 17.0.3 update.

What devices are affected by CVE-2023-42824?

The kernel flaw impacts iPhones and iPads capable of running iOS 15 or later, including:

  • iPhone 8 and newer
  • iPad Pro all models
  • iPad Air 3rd gen and newer
  • iPad 5th gen and newer
  • iPad mini 5th gen and newer

Any model able to run iOS 16 or iOS 17 is affected and needs to be updated to iOS 17.0.3.

How serious is this vulnerability?

CVE-2023-42824 is considered a critical severity flaw that allowed an attacker to gain full admin access and control of the device. Apple treated this as a serious zero-day exploit due to it being actively exploited in the wild. All users should update immediately to avoid potential compromise.

What kind of access did an attacker need to leverage this?

The flaw required an attacker to have physical access to the target device in order to run malicious code. Remote or network-based exploitation was not possible. But if physical access was obtained, full compromise of the device was possible.

What settings or apps could have mitigated this?

There were no effective mitigations for this kernel vulnerability. All affected devices were susceptible to some degree until installing the iOS 17.0.3 patch. Even security measures like passcodes could potentially be bypassed if the device was successfully exploited via CVE-2023-42824. Updating is the only sure way to protect your device.

Does iOS 17.0.3 fix any other issues?

Yes, iOS 17.0.3 also resolves a thermal management bug affecting the iPhone 14 Pro and Pro Max models. It prevents those devices from getting too warm during intensive tasks like gaming or AR usage. All iPhone 14 Pro users should install 17.0.3 to correct the overheating issue.

What’s the best way to install iOS 17.0.3?

The over-the-air (OTA) update is the simplest method. Connect to WiFi, plug into power, go to Settings > General > Software Update and tap “Download and Install” when you see iOS 17.0.3 available. The update process will automatically handle everything else seamlessly.

Is my data safe when updating to iOS 17.0.3?

Yes, the iOS update process is designed to safely update system files without affecting user data. No personal content, photos, emails, etc. will be lost or changed when updating. However, it’s still wise to back up your device to iCloud or iTunes before any update as a precaution.

Should I expect any impacts after updating?

The 17.0.3 update focuses solely on security fixes and should not introduce any new features or user-facing changes. Performance and battery life should remain consistent. As always, if you notice any unexpected behavior after updating, try restarting your device or contacting Apple support for troubleshooting.


The critical kernel vulnerability CVE-2023-42824 demonstrated that even security-focused platforms like iOS can contain risks that need urgent patching. By releasing iOS 17.0.3 swiftly after the flaw’s discovery, Apple has helped protect customers from potential compromise and system access abuse.

Updating to iOS 17.0.3 remains the only guaranteed method to fully resolve CVE-2023-42824, as well as remedy the thermal issue on iPhone 14 Pro models. Users are strongly encouraged to install iOS 17.0.3 immediately on any eligible iPhones and iPads to ensure the safety and integrity of their personal data.

Table summarizing the key details:

DescriptionKernel flaw enabling escalation of privilege
SeverityCritical 9.8 out of 10
Versions AffectediOS 15 to 17.0.2
Versions PatchediOS 17.0.3
Date PatchedOctober 2023
MitigationUpdate to iOS 17.0.3
Exploited in the Wild?Yes, actively exploited before patching

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