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    Prisma Browser

    Advanced Browser Protection

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    Advanced Browser Protection

    Advanced Browser Protection
    Where Can I Use This?What Do I Need?
    • Prisma Browser Standalone
    Advanced Browser Protection (WASM Guard) is a proactive security control within the Prisma Browser hardening suite. It protects endpoints from zero-day vulnerabilities and memory-resident exploits that abuse WebAssembly (WASM) to achieve remote code execution (RCE).
    This control operates at the browser memory layer to stop exploitation attempts before attackers can escape the browser sandbox or escalate privileges to the operating system.

    Overview

    WebAssembly (WASM) is a high-performance binary instruction format that modern browsers use to execute complex, compute-intensive applications. While WASM improves performance, attackers increasingly use it as a delivery mechanism for sophisticated browser-based exploits.
    WASM Guard monitors the browser’s memory translation layer and enforces strict memory access boundaries. When a process attempts to write outside its permitted memory scope, WASM Guard immediately blocks the action, preventing the exploit from progressing.

    Background

    Modern browser attacks typically begin with malicious JavaScript that triggers a memory corruption vulnerability. Attackers then use WASM’s in-memory table structures to write to unauthorized memory addresses and gain execution rights.
    WASM Guard functions as a validator at the memory translation layer. Similar to how a DNS resolver maps names to IP addresses, WASM Guard verifies that each memory access request maps to an approved address range. If a process attempts to access memory outside its allowed scope, WASM Guard immediately terminates the action.
    This follows MITRE ATT&CK T1203 - Exploitation for Client Execution

    Configuring Advanced Browser Protection

    For information regarding configuration, refer to Configure Browser Hardening.

    Monitoring and Incident Response

    When WASM Guard intercepts an exploit attempt, Prisma Browser generates a Tampering Event and displays it in the Security Dashboard.
    EVENT FORENSIC DETAILS
    Security teams can review the following fields to investigate the incident:
    • Event Type: RCE exploit attempt.
    • Detection sensor: WASM Guard.
    • Exploited URL: URL hosting the malicious WASM or JavaScript content.
    • User/Device: User identity and endpoint where the block occurred.

    Response and Remediation

    Because WASM Guard stops the exploit at the point of execution, endpoints typically require no additional remediation.
    However, administrators should take the following actions:
    • Block the exploited URL at the network or security policy level.
    • Investigate the traffic source to identify potential compromise attempts or broader campaigns.
    • Review related security events to confirm that no lateral activity occurred.

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