CVE-2025-0238

What it actually does

A controlled failed memory allocation triggers a use-after-free condition that can lead to memory corruption and a potentially exploitable crash.

Why it matters to the business

Remote attackers can crash affected applications or achieve code execution, resulting in service disruption, data exposure, or full system compromise for organizations relying on the vulnerable software versions.

How an attack unfolds

An attacker supplies specially crafted input that forces a memory allocation failure at a precise point, allowing reuse of the freed object to corrupt memory and gain control of execution flow.

How to fix it

Upgrade perl on Ubuntu 14.04 LTS to version 5.18.2-2ubuntu1.3 and on Ubuntu 16.04 LTS to 5.22.1-9ubuntu0.2; apply equivalent updates for any Mozilla products matching the described fixes.

How to confirm the fix worked

Verify installed package versions match the listed fixed releases and confirm the vulnerable code paths no longer exhibit the allocation failure behavior.

Typical attack path

1. Deliver malicious content or input to the target application
2. Trigger a controlled memory allocation failure
3. Reuse the dangling pointer to corrupt memory structures
4. Achieve arbitrary code execution or denial of service

How to detect it

Inspect system and application logs for crashes involving allocation failures followed by unexpected memory access patterns; review process dumps for signs of memory reuse after free.

What your security team should do

• Apply the specified package upgrades immediately across all affected Ubuntu systems
• Monitor for any new exploit code given the use-after-free nature
• Review application memory safety configurations and sandboxing controls