CVE-2019-18928 Auth bypass in n/a

Critical 9.8 Published 15 Nov 2019 Updated 5 Aug 2024

Attackers can escalate privileges by exploiting connection reuse in Cyrus IMAP, allowing HTTP requests to inherit authentication contexts from previous requests.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2019-18928?

CVE-2019-18928 is a critical authentication bypass vulnerability in Debian Debian Linux, published on 15 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Cyrus IMAP 2.5.x before 2.5.14 and 3.x before 3.0.12 allows privilege escalation because an HTTP request may be interpreted in the authentication context of an unrelated previous request that arrived over the same connection.

Which versions are affected by CVE-2019-18928?

It affects 3 products.

Products include Cyrus Imap, Debian Debian Linux, Fedoraproject Fedora.

How do I fix CVE-2019-18928?

Upgrade to a fixed version.

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

Is CVE-2019-18928 being exploited?

There is no known exploitation of CVE-2019-18928 in the wild and no public exploit code.

All Debian Debian Linux vulnerabilities

Sources

Also known as CLSA-2025-1738170525, DEBIAN-CVE-2019-18928, GHSA-mpmx-j2j3-253q, UBUNTU-CVE-2019-18928.