Apple WebKit Bounds Check Flaw Leading to Arbitrary Code Execution (CVE-2022-48503)
Executive & SecOps Summary
SECOPS ASSESSMENTApple iOS/iPadOS prior to 15.6, macOS Monterey prior to 12.5, Safari prior to 15.6, watchOS prior to 8.7, and tvOS prior to 15.6
Processing maliciously crafted web content may allow remote attackers to execute arbitrary code on the target system
Immediately apply the official software updates provided by Apple to upgrade to patched versions
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
To mitigate this vulnerability, update your Apple operating systems and Safari browser to the latest versions. For enterprise macOS environments, you can force software updates via the command-line interface:
# List all available software updates
softwareupdate -l
# Download and install all critical security updates and restart the system
sudo softwareupdate -ia --restart2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, restrict users from visiting untrusted websites and disable automatic loading of remote content in mail clients. Implement strict outbound filtering on corporate firewalls to block connections to suspicious or unverified external domains.
3. Log Audit & IoC Verification Commands
Use the following shell commands to audit the current macOS and Safari versions to verify if the system is running a vulnerable version:
# Verify the current macOS operating system version
echo '[+] Checking macOS Version...'
sw_vers
# Verify the installed Safari browser version
echo '[+] Checking Safari Version...'
if [ -d '/Applications/Safari.app' ]; then
defaults read /Applications/Safari.app/Contents/Info.plist CFBundleShortVersionString
else
echo '[-] Safari is not installed in the default path.'
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2022-48503) is an improper bounds check issue (CWE-129) residing within Apple's WebKit rendering engine. The root cause lies in the insufficient validation of array indexes or memory buffer boundaries when processing web content, leading to potential out-of-bounds memory access.
2. Exploitation Mechanics & Attack Scenario
An attacker can exploit this vulnerability by hosting a specially crafted web page containing malicious HTML or JavaScript. When a victim visits the malicious site using a vulnerable version of Safari or any application utilizing the WebKit framework, the engine fails to validate memory boundaries, triggering memory corruption and enabling arbitrary code execution in the context of the browser process.
3. Infrastructure & Business Impact
As this vulnerability is listed in the CISA KEV catalog, it represents an active threat with confirmed wild exploitation. Successful exploitation can lead to complete compromise of endpoint devices (iPhones, iPads, and Macs), allowing attackers to exfiltrate sensitive corporate data, harvest credentials, and establish a foothold within the enterprise network.
Official Vendor Advisories & References
The issue was addressed with improved bounds checks. This issue is fixed in tvOS 15.6, watchOS 8.7, iOS 15.6 and iPadOS 15.6, macOS Monterey 12.5, Safari 15.6. Processing web content may lead to arbitrary code execution.
Frequently Asked SecOps Questions (CVE-2022-48503)
FAQQ1. How critical is CVE-2022-48503 and is it actively exploited in the wild?
CVE-2022-48503 is rated CVSS 8.8 (HIGH) with a 30-day EPSS exploitation probability of 3.2%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2022-48503?
Primary impacted vendors include apple across safari, ios, ipados, macos, watchos, tvos. Scope summary: iOS < 15.6, iPadOS < 15.6, macOS Monterey < 12.5, Safari < 15.6, watchOS < 8.7, tvOS < 15.6
Q3. What temporary mitigations or workarounds exist for CVE-2022-48503 before patching?
[Mitigation] Immediately apply the official software updates provided by Apple to upgrade to patched versions Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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