CVE-2024-22919

What it actually does

Global buffer overflow in parseExpression allows memory corruption when processing malformed input, enabling potential arbitrary code execution or denial of service.

Why it matters to the business

Attackers with local access can run malicious code on affected systems when users process untrusted files, risking data theft, system compromise, or ransomware deployment; the tool sees limited modern use but remains in legacy workflows.

How an attack unfolds

An attacker crafts a specially formed SWF file that triggers the overflow during parsing; the victim runs the swfc tool on the file, leading to memory corruption that the attacker leverages for code execution.

How to fix it

No official fixed versions are published; discontinue use of the affected swftools release, apply compiler-level mitigations such as ASLR and stack canaries when building from source, or replace with maintained alternatives.

How to confirm the fix worked

Rebuild and test with AddressSanitizer or similar memory-error detectors against known triggering inputs; verify the vulnerable parseExpression path is no longer reachable or that bounds checks prevent overflow.

Typical attack path

1. Craft malicious SWF input targeting the parseExpression function
2. Deliver the file to the target user or system
3. Victim executes swfc on the malformed file
4. Trigger buffer overflow and achieve code execution or crash

How to detect it

Review process execution logs and file-access records for invocations of swfc on untrusted or externally sourced files; look for crashes or abnormal memory usage during parsing.

What your security team should do

• Remove or isolate swftools from production and developer environments
• Scan file-processing pipelines for any remaining usage of the tool
• Block execution of swfc via application allowlisting where possible
• Monitor for new upstream patches or forks that address the issue