CVE-2018-4003 Memory corruption in CUJO

High 8.3 Published 21 Mar 2019 Updated 5 Aug 2024

An unauthenticated attacker can achieve arbitrary code execution on CUJO Smart Firewalls via a heap overflow in the mdnscap binary triggered by malicious mDNS messages.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-4003?

CVE-2018-4003 is a high-severity memory corruption vulnerability in CUJO, published on 21 Mar 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An exploitable heap overflow vulnerability exists in the mdnscap binary of the CUJO Smart Firewall running firmware 7003. The string lengths are handled incorrectly when parsing character strings in mDNS resource records, leading to arbitrary code execution in the context of the mdnscap process. An unauthenticated attacker can send an mDNS message to trigger this vulnerability.

Weakness: CWE-787

Which versions are affected by CVE-2018-4003?

It affects 1 product.

Products include Getcujo Smart Firewall.

How do I fix CVE-2018-4003?

No fix has been published for CVE-2018-4003 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2018-4003 being exploited?

There is no known exploitation of CVE-2018-4003 in the wild and no public exploit code.

Sources

Also known as GHSA-v346-9qx9-79fj.