CVE-2022-34470

What it actually does

Use-after-free in session history navigation handling that can result in memory corruption and a potentially exploitable crash, enabling remote code execution.

Why it matters to the business

Successful exploitation could allow attackers to execute arbitrary code on user systems, risking data theft, malware deployment, or further network compromise; however, the vulnerability is years old with no observed exploitation or ransomware usage and low EPSS, indicating limited active threat.

How an attack unfolds

An attacker crafts a malicious web page that performs targeted session history navigations to trigger the use-after-free condition in the browser's memory management, leading to a crash that can be leveraged for code execution without user interaction beyond visiting the page.

How to fix it

Upgrade Mozilla Firefox to version 102 or later, Firefox ESR to 91.11 or later, Thunderbird to 102 or 91.11 or later, and apply any subsequent security updates; disable unnecessary browser features if patching is delayed.

How to confirm the fix worked

Confirm installed versions meet or exceed the fixed releases listed above; review browser update logs and perform memory safety testing or crash analysis on affected builds if needed.

Typical attack path

1. Host a malicious website containing crafted HTML and JavaScript that manipulates browser session history
2. Lure a victim to visit the page via phishing or compromised sites
3. Trigger specific navigation sequences to induce the use-after-free and achieve memory corruption for RCE

How to detect it

Examine browser crash logs and memory dumps for session history related use-after-free indicators; review web proxy or endpoint logs for suspicious navigation patterns from untrusted domains, though no public exploitation artifacts are known.

What your security team should do

• Immediately inventory and update all instances of affected Mozilla products across the environment
• Monitor threat intelligence feeds for any future exploit development given the high CVSS despite current low EPSS
• Enforce automatic updates for browsers and email clients as a standard policy