CVE-2020-4067 Improper Initialization in coturn

What is CVE-2020-4067?

CVE-2020-4067 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 29 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In coturn before version 4.5.1.3, there is an issue whereby STUN/TURN response buffer is not initialized properly. There is a leak of information between different client connections. One client (an attacker) could use their connection to intelligently query coturn to get interesting bytes in the padding bytes from the connection of another client. This has been fixed in 4.5.1.3.

Weakness: CWE-665

Which versions are affected by CVE-2020-4067?

It affects 5 products.

Products include Canonical Ubuntu Linux, Coturn Project Coturn, Debian Debian Linux, Fedoraproject Fedora, Opensuse Leap.

How do I fix CVE-2020-4067?

Upgrade to a fixed version.

Is CVE-2020-4067 being exploited?

There is no known exploitation of CVE-2020-4067 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLEANSTART-2023-MZ92027, DEBIAN-CVE-2020-4067, DLA-2271-1, GHSA-c8r8-8vp5-6gcm, MGASA-2020-0287, UBUNTU-CVE-2020-4067 and 1 more.