How CVE-2025-30427 Works
CVE-2025-30427 is a use-after-free vulnerability in Apple Safari’s WebKit engine. The flaw occurs when improperly handled memory references allow malicious web content to trigger the release of a memory object while still in use. When Safari attempts to access this freed memory, it crashes or potentially allows arbitrary code execution. Attackers craft malicious JavaScript or HTML that manipulates DOM objects, forcing premature deallocation. The lack of proper memory management validation leads to exploitation, compromising user sessions or device control.
DailyCVE Form
Platform: Apple Safari
Version: < 18.4
Vulnerability: Use-After-Free
Severity: Critical
Date: 04/07/2025
What Undercode Say:
Exploitation:
1. Craft malicious HTML/JS invoking rapid DOM mutations.
2. Force premature object deallocation via event handlers.
3. Overwrite freed memory with shellcode.
Protection:
1. Update Safari to v18.4+.
2. Disable JavaScript for untrusted sites.
3. Deploy WAF rules blocking suspicious DOM operations.
Detection Commands:
Check Safari version (macOS): defaults read /Applications/Safari.app/Contents/Info.plist CFBundleShortVersionString Log crashes (iOS/macOS): log show --predicate 'process == "Safari"' --last 24h
PoC (Conceptual):
<script>
let trigger = document.createElement('div');
document.body.appendChild(trigger);
trigger.addEventListener('animationend', () => {
// Force UAF via crafted event loop
trigger.remove();
setTimeout(() => { trigger.click(); }, 1);
});
</script>
Mitigation Code (WAF Rule):
location / {
if ($args ~ "malicious_pattern") { return 403; }
add_header Content-Security-Policy "script-src 'self'";
}
Memory Analysis (macOS):
Monitor WebKit processes: vmmap --pages $(pgrep WebKit)
References:
- Apple Security Advisory: ASA-2025-XXX
- NVD: CVE-2025-30427
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-30427
Extra Source Hub:
Undercode
