CVE-2025-0306

What it actually does

The vulnerability enables a Marvin Attack against the Ruby interpreter's cryptographic implementation, permitting decryption of encrypted messages or forgery of signatures through repeated message exchanges with the affected service.

Why it matters to the business

Attackers may compromise the confidentiality and integrity of encrypted data or signatures handled by affected systems, risking unauthorized access to sensitive information and potential operational disruptions in environments relying on the vulnerable packages.

How an attack unfolds

An attacker interacts repeatedly with the vulnerable service to exchange crafted messages, observes response behaviors to gradually recover cryptographic secrets, and ultimately decrypts prior messages or forges valid signatures.

How to fix it

Update opencv packages on Ubuntu 16.04 LTS to version 2.4.9.1+dfsg-1.5ubuntu1.1 and on Ubuntu 18.04 LTS to version 3.2.0+dfsg-4ubuntu0.1; apply all related security patches for Ruby cryptographic components.

How to confirm the fix worked

Confirm installed package versions match the listed fixed releases, retest cryptographic functions for resistance to message probing attacks, and review service configurations for updated libraries.

Typical attack path

1. Locate services using the vulnerable Ruby cryptographic code
2. Send numerous probe messages to elicit distinguishable responses
3. Analyze timing or error patterns to extract key material
4. Decrypt target ciphertexts or forge signatures for further access

How to detect it

Examine application and system logs for unusually high volumes of requests to cryptographic endpoints, repeated error responses during decryption or signature verification, and anomalous patterns consistent with probing attacks.

What your security team should do

• Prioritize applying the exact package upgrades listed for Ubuntu opencv
• Audit all Ruby-dependent applications for exposure to the cryptographic weakness
• Implement network controls to limit excessive message volumes to affected services