CVE-2022-40884

What it actually does

Memory leak triggered during execution of the mp4fragment utility on malformed MP4 input, causing progressive heap exhaustion without releasing allocated buffers.

Why it matters to the business

Applications and build pipelines that invoke mp4fragment to process untrusted video files can experience gradual memory exhaustion, leading to degraded performance or service interruption on affected hosts.

How an attack unfolds

An attacker supplies a specially crafted MP4 file to the mp4fragment tool; repeated or automated invocation on the file causes unbounded memory allocations that are never freed, exhausting system resources over time.

How to fix it

Upgrade Bento4 to the most recent available release that resolves the leak; if no patched version exists, replace mp4fragment usage with an alternative MP4 fragmentation utility or sandbox the tool with strict memory limits.

How to confirm the fix worked

Run mp4fragment under a memory profiler or with address sanitizer on both known-good and suspect MP4 files, confirming stable memory usage after the update; monitor process RSS over multiple invocations.

Typical attack path

1. Attacker generates or modifies an MP4 file to trigger the leak path in mp4fragment
2. Victim or automated process executes mp4fragment against the supplied file
3. Tool allocates memory that is not released for the duration of processing
4. Repeated invocations or long-running jobs deplete available RAM
5. System or process becomes unresponsive or crashes due to memory pressure

How to detect it

Review process accounting logs, container memory metrics, and system OOM events for sustained growth in resident memory during mp4fragment executions; correlate with file-processing timestamps and input file hashes.

What your security team should do

• Inventory all systems and CI pipelines that invoke mp4fragment and prioritize removal or replacement
• Apply the latest Bento4 build if a fix has been published since the original report
• Enforce strict input validation and resource limits around any remaining use of the tool
• Add memory-usage alerts for processes running Bento4 utilities