CVE-2018-1000408 Improper Authorization in Jenkins

What is CVE-2018-1000408?

CVE-2018-1000408 is a medium-severity denial of service vulnerability in Jenkins Jenkins, published on 9 Jan 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A denial of service vulnerability exists in Jenkins 2.145 and earlier, LTS 2.138.1 and earlier in core/src/main/java/hudson/security/HudsonPrivateSecurityRealm.java that allows attackers without Overall/Read permission to access a specific URL on instances using the built-in Jenkins user database security realm that results in the creation of an ephemeral user record in memory.

Which versions are affected by CVE-2018-1000408?

4 open source packages ship an affected version, including org.jenkins-ci.main:jenkins-core. It affects 1 product.

Products include Jenkins Jenkins.

How do I fix CVE-2018-1000408?

Upgrade org.jenkins-ci.main:jenkins-core to a fixed version for your release line: 2.138.2 or 2.146.

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-2018-1000408 being exploited?

There is no known exploitation of CVE-2018-1000408 in the wild and no public exploit code.

Other vulnerabilities in Jenkins Jenkins

• CVE-2024-23897 Jenkins Command Line Interface (CLI) Path Traversal Exploited Critical 9.8
• CVE-2018-1000861 Jenkins Stapler Web Framework Deserialization of Untrusted Data Exploited Critical 9.8
• CVE-2017-1000353 Jenkins Remote Code Execution Exploited Critical 9.8
• CVE-2015-5317 Jenkins User Interface (UI) Information Disclosure Exploited High 7.5
• CVE-2021-21690 Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins Critical 9.8

All Jenkins Jenkins vulnerabilities

Sources

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

Also known as GHSA-4h47-h3cr-23wh.