CVE-2015-4004

What it actually does

The OZWPAN driver parses network packets using an untrusted length field, enabling out-of-bounds reads that expose kernel memory contents or trigger system crashes.

Why it matters to the business

Affected Linux-based deployments face risk of remote information disclosure or denial-of-service outages, with potential operational disruption for any services relying on the vulnerable kernel; the issue remains exploitable years after disclosure with public exploit code available.

How an attack unfolds

An attacker crafts a malicious network packet with an oversized or malformed length field targeting the OZWPAN driver, causing an out-of-bounds read that either leaks sensitive kernel data or crashes the system; the low attack complexity allows unauthenticated remote exploitation.

How to fix it

Upgrade affected products to the fixed versions provided by vendors; for vault (Bitnami) apply version 1.11.11 or later, and ensure underlying Linux kernels receive all relevant OZWPAN patches.

How to confirm the fix worked

Confirm product versions match or exceed the stated fixed releases, verify absence of the vulnerable driver code paths via kernel configuration checks, and test that crafted packets no longer produce out-of-bounds behavior or crashes.

Typical attack path

1. Identify exposed systems running the vulnerable OZWPAN driver
2. Send a single crafted packet with manipulated length field
3. Trigger out-of-bounds read to achieve memory disclosure or kernel panic
4. Repeat or chain packets for sustained denial of service or data exfiltration

How to detect it

Search system and kernel logs for repeated out-of-bounds read warnings or unexpected crashes correlated with network activity; examine packet captures for unusual length fields in OZWPAN traffic.

What your security team should do

• Prioritize patching vault (Bitnami) installations to version 1.11.11 within maintenance windows
• Disable OZWPAN functionality where not required to reduce attack surface
• Monitor network traffic for anomalous packet sizes targeting kernel drivers
• Review EPSS trend and exploit availability to maintain awareness of residual risk on unpatched systems