CVE-2020-3811 Auth bypass in netqmail

What is CVE-2020-3811?

CVE-2020-3811 is a high-severity authentication bypass vulnerability in Canonical Ubuntu Linux, published on 26 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

qmail-verify as used in netqmail 1.06 is prone to a mail-address verification bypass vulnerability.

Weakness: CWE-863, CWE-665

Which versions are affected by CVE-2020-3811?

It affects 3 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Netqmail Netqmail.

How do I fix CVE-2020-3811?

Apply the vendor's patch.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2020-3811 being exploited?

There is no known exploitation of CVE-2020-3811 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 GHSA-w7qp-9896-2fvp, UBUNTU-CVE-2020-3811.