CVE-2018-9336 Use after free in n/a

High 7.8 Published 1 May 2018 Updated 5 Aug 2024

A local attacker can trigger a double-free in the OpenVPN interactive service, causing denial of service or potential privilege escalation.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2018-9336?

CVE-2018-9336 is a high-severity use after free vulnerability in Slackware Slackware Linux, published on 1 May 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

openvpnserv.exe (aka the interactive service helper) in OpenVPN 2.4.x before 2.4.6 allows a local attacker to cause a double-free of memory by sending a malformed request to the interactive service. This could cause a denial-of-service through memory corruption or possibly have unspecified other impact including privilege escalation.

Weakness: CWE-415

Which versions are affected by CVE-2018-9336?

It affects 2 products.

Linux distribution packages (1)

openvpn SUSE:Linux Enterprise Module for Basesystem 15 All versions 2.4.3-5.3.19

Products include Openvpn Openvpn, Slackware Slackware Linux.

How do I fix CVE-2018-9336?

Upgrade to a fixed version.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2018-9336 being exploited?

There is no known exploitation of CVE-2018-9336 in the wild and no public exploit code.

All Slackware Slackware Linux vulnerabilities

Sources

Also known as ALPINE-CVE-2018-9336, GHSA-9p34-3252-9gh9, MGASA-2018-0329, SUSE-SU-2018:1888-1.