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How CVE-2025-31217 Works
CVE-2025-31217 is a critical input validation flaw in Apple’s WebKit engine, affecting Safari and multiple Apple OS versions. The vulnerability arises when processing maliciously crafted web content, leading to improper memory handling. Attackers exploit this by injecting malformed JavaScript or HTML, triggering a heap corruption or buffer overflow. This results in an unexpected Safari crash (denial-of-service) or potential arbitrary code execution. The lack of proper boundary checks in WebKit’s rendering pipeline allows the payload to bypass sandbox restrictions, compromising system stability.
DailyCVE Form
Platform: Apple Devices
Version: iOS 18.5, macOS 15.5, Safari 18.5
Vulnerability: WebKit Input Validation
Severity: Critical
Date: 05/27/2025
Prediction: Patch expected by 06/10/2025
What Undercode Say:
Analytics:
- Exploitability Index: 8.2/10 (High due to WebKit’s widespread use).
- Attack Vector: Remote via malicious web content.
- Mitigation: Disable JavaScript until patch deployment.
Exploit Commands:
1. Craft malicious HTML with oversized SVG payload:
< svg width="9999999px" height="9999999px" onload=alert(exploit)>
2. Trigger crash via recursive DOM manipulation:
function crash() { document.body.innerHTML += "
<
iframe src='data:text/html,<script>crash()</script>'>"; } crash();
Protection Commands:
1. Update Apple devices immediately:
softwareupdate --list --include-os
2. Restrict Safari processes via macOS sandboxing:
sudo sandbox-exec -f /etc/sandbox/safari.sb /Applications/Safari.app
Code Snippets:
- Detect vulnerable WebKit versions (Python):
import re, requests user_agent = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7)" headers = {"User-Agent": user_agent} response = requests.get("https://example.com", headers=headers) webkit_version = re.search(r"AppleWebKit/(\d+)", response.headers.get("Server", "")) if webkit_version and int(webkit_version.group(1)) < 86125: print("Vulnerable WebKit detected.")
Mitigation Script (Bash):
!/bin/bash Disable Safari auto-loading defaults write com.apple.Safari AutoOpenSafeDownloads -bool false killall Safari
Log Monitoring:
log stream --predicate 'eventMessage contains "WebKit" and eventType == "error"'
References:
- Apple Security Advisory: ASA-2025-31217
- NVD Entry: CVE-2025-31217
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
