CVE-2019-3883 Denial of service in 389-ds-base

Medium 5.3 Published 17 Apr 2019 Updated 4 Aug 2024

An unauthenticated attacker can cause a Denial of Service in 389-ds-base by exploiting missing timeouts on SSL/TLS connections to exhaust worker threads.

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

What is CVE-2019-3883?

CVE-2019-3883 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 17 Apr 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In 389-ds-base up to version 1.4.1.2, requests are handled by workers threads. Each sockets will be waited by the worker for at most 'ioblocktimeout' seconds. However this timeout applies only for un-encrypted requests. Connections using SSL/TLS are not taking this timeout into account during reads, and may hang longer.An unauthenticated attacker could repeatedly create hanging LDAP requests to hang all the workers, resulting in a Denial of Service.

Weakness: CWE-772

Which versions are affected by CVE-2019-3883?

It affects 3 products.

Linux distribution packages (20)

`389-ds-base` Red Hat:enterprise_linux:7::client	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-debuginfo` Red Hat:enterprise_linux:7::client	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-devel` Red Hat:enterprise_linux:7::client	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-libs` Red Hat:enterprise_linux:7::client	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-snmp` Red Hat:enterprise_linux:7::client	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base` Red Hat:enterprise_linux:7::computenode	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-debuginfo` Red Hat:enterprise_linux:7::computenode	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-devel` Red Hat:enterprise_linux:7::computenode	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-libs` Red Hat:enterprise_linux:7::computenode	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-snmp` Red Hat:enterprise_linux:7::computenode	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base` Red Hat:enterprise_linux:7::server	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-debuginfo` Red Hat:enterprise_linux:7::server	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-devel` Red Hat:enterprise_linux:7::server	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-libs` Red Hat:enterprise_linux:7::server	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-snmp` Red Hat:enterprise_linux:7::server	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base` Red Hat:enterprise_linux:7::workstation	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-debuginfo` Red Hat:enterprise_linux:7::workstation	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-devel` Red Hat:enterprise_linux:7::workstation	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-libs` Red Hat:enterprise_linux:7::workstation	All versions	`0:1.3.8.4-25.1.el7_6`
`389-ds-base-snmp` Red Hat:enterprise_linux:7::workstation	All versions	`0:1.3.8.4-25.1.el7_6`

Products include Debian Debian Linux, Fedoraproject 389 Directory Server, Redhat Enterprise Linux.

How do I fix CVE-2019-3883?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-3883 being exploited?

There is no known exploitation of CVE-2019-3883 in the wild and no public exploit code.

All Debian Debian Linux vulnerabilities

Sources

Also known as DEBIAN-CVE-2019-3883, DLA-1779-1, GHSA-c65q-p9xj-798w, RHSA-2019:1896, UBUNTU-CVE-2019-3883.