CVE-2022-31745

What it actually does

The garbage collector can become confused about valid objects when array shift operations are avoided, resulting in memory corruption within the browser process.

Why it matters to the business

Limited risk of data manipulation or application instability for users visiting crafted web content, with low overall operational disruption due to the requirement for user interaction and restricted impact.

How an attack unfolds

An attacker hosts a webpage containing JavaScript that performs non-standard array operations to trigger garbage collector confusion; when a user visits the page the browser's memory state becomes inconsistent, allowing the attacker to achieve limited integrity effects.

How to fix it

Upgrade Mozilla Firefox to version 101 or later on all endpoints; enable automatic updates where possible and verify deployed versions centrally.

How to confirm the fix worked

Confirm all Firefox installations report version 101 or higher; retest affected functionality with known triggering JavaScript patterns after upgrade.

Typical attack path

1. Host a malicious webpage with crafted JavaScript array operations
2. Lure a user to visit the page via phishing or compromised site
3. Trigger garbage collector activity through page content
4. Exploit resulting object confusion to perform limited memory writes

How to detect it

Monitor browser process crash logs and memory error reports for patterns matching non-standard array handling; correlate with web proxy logs showing visits to suspicious domains.

What your security team should do

• Prioritize browser updates across the fleet within standard patch windows
• Block or warn on untrusted external links until patches are applied
• Review endpoint update compliance dashboards for Firefox