CVE-2019-13565 Auth bypass in n/a

High 7.5 Published 26 Jul 2019 Updated 14 Oct 2026

Attackers can bypass access controls in OpenLDAP by exploiting retained SASL security layer values, allowing unauthorized access to protected data.

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

What is CVE-2019-13565?

CVE-2019-13565 is a high-severity authentication bypass vulnerability in Apple Mac Os X, published on 26 Jul 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in OpenLDAP 2.x before 2.4.48. When using SASL authentication and session encryption, and relying on the SASL security layers in slapd access controls, it is possible to obtain access that would otherwise be denied via a simple bind for any identity covered in those ACLs. After the first SASL bind is completed, the sasl_ssf value is retained for all new non-SASL connections. Depending on the ACL configuration, this can affect different types of operations (searches, modifications, etc.). In other words, a successful authorization step completed by one user affects the authorization requirement for a different user.

Which versions are affected by CVE-2019-13565?

It affects 9 products.

Products include Apple Mac Os X, Canonical Ubuntu Linux, Debian Debian Linux, F5 Traffix Signaling Delivery Controller, Openldap Openldap, Opensuse Leap and 3 more.

How do I fix CVE-2019-13565?

Upgrade to a fixed version.

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

Is CVE-2019-13565 being exploited?

There is no known exploitation of CVE-2019-13565 in the wild and no public exploit code.

All Apple Mac Os X vulnerabilities

Sources

Also known as ALPINE-CVE-2019-13565, CLEANSTART-2026-ZY54094, DEBIAN-CVE-2019-13565, GHSA-49q9-mmpr-r526, UBUNTU-CVE-2019-13565.