CVE-2021-21663 Missing permission check in Jenkins XebiaLabs XL Deploy Plugin allows capturing credentials

Medium 4.3 Published 10 Jun 2021 Updated 3 Aug 2024

Attackers with read access can exploit missing permission checks to capture stored credentials by connecting to attacker-controlled URLs.

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

What is CVE-2021-21663?

CVE-2021-21663 is a medium-severity missing authorization vulnerability in Jenkins XebiaLabs XL Deploy Plugin, published on 10 Jun 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A missing permission check in Jenkins XebiaLabs XL Deploy Plugin 7.5.8 and earlier allows attackers with Overall/Read permission to connect to an attacker-specified URL using attacker-specified credentials IDs obtained through another method, capturing Username/password credentials stored in Jenkins.

Which versions are affected by CVE-2021-21663?

2 open source packages ship an affected version, including com.xebialabs.deployit.ci:deployit-plugin. It affects 1 product.

Package	Affected	Fixed in
`com.xebialabs.deployit.ci:deployit-plugin` Maven	All versions	`10.0.2`
`com.xebialabs.deployit.ci:deployit-plugin` Maven	All versions	`10.0.2`

Products include Jenkins Xebialabs Xl Deploy.

How do I fix CVE-2021-21663?

Upgrade com.xebialabs.deployit.ci:deployit-plugin to 10.0.2 or later.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2021-21663 being exploited?

There is no known exploitation of CVE-2021-21663 in the wild and no public exploit code.

Sources

Also known as GHSA-6mpp-cm3v-23vv.