💥 Heap Spraying in Browser Exploits 🧠🌐

Heap spraying is a powerful exploitation technique used by attackers to increase the reliability of browser-based attacks — especially when targeting memory corruption vulnerabilities like use-after-free or buffer overflows.

🧪 What Is Heap Spraying?
It’s the process of filling the heap (memory) with large amounts of malicious code or data, hoping it lands at a predictable location in memory.

🔁 So when an exploit triggers a bug that hijacks execution (like a corrupted pointer), it will likely jump to the malicious payload planted by the attacker.

🌐 In Browser Exploits:
Heap spraying is commonly used with JavaScript in browsers:

var spray = unescape("%u9090%u9090%u4141..."); // NOP sled + shellcode
var mem = [];
for (var i = 0; i < 10000; i++) {
mem.push(spray + i); // Flood the heap
}

💣 When the vulnerability is triggered, the browser's execution flow is redirected into this "sprayed" memory zone.

⚠️ Why It’s Dangerous:
Can turn unstable crashes into reliable exploits

Used in drive-by downloads, malware injection, and zero-day attacks

Often combined with obfuscation to evade detection

🛡 Mitigations:
✅ Memory randomization (ASLR)
✅ Modern browsers have better memory handling
✅ Deprecation of old plugins (e.g., Flash)
✅ Use Content Security Policy (CSP) and sandboxing



#CyberSecurity #HeapSpraying #BrowserExploits #MemoryExploitation #WebHacking #InfoSec #JavaScriptSecurity #ZeroDay #ExploitDev #MalwareTechniques

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