CVE-2020-1757 Improper Input Validation in Undertow

High 8.1 Published 21 Apr 2020 Updated 4 Aug 2024

Attackers can bypass security controls in Undertow by exploiting incorrect servlet path normalization involving semicolons.

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-2020-1757?

CVE-2020-1757 is a high-severity vulnerability in Redhat Jboss Enterprise Application Platform, published on 21 Apr 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A flaw was found in all undertow-2.x.x SP1 versions prior to undertow-2.0.30.SP1, all undertow-1.x.x and undertow-2.x.x versions prior to undertow-2.1.0.Final, where the Servlet container causes servletPath to normalize incorrectly by truncating the path after semicolon which may lead to an application mapping resulting in the security bypass.

Weakness: CWE-200, CWE-20

Which versions are affected by CVE-2020-1757?

2 open source packages ship an affected version, including io.undertow:undertow-core. It affects 6 products.

Package	Affected	Fixed in
`io.undertow:undertow-core` Maven	All versions	`2.1.0`
`io.undertow:undertow-core` Maven	All versions	`2.1.0`

Products include Redhat Jboss Data Grid, Redhat Jboss Enterprise Application Platform, Redhat Jboss Fuse, Redhat Openshift Application Runtimes, Redhat Single Sign-On, Redhat Undertow.

How do I fix CVE-2020-1757?

Upgrade io.undertow:undertow-core to 2.1.0 or later.

Is CVE-2020-1757 being exploited?

There is no known exploitation of CVE-2020-1757 in the wild and no public exploit code.

All Redhat Jboss Enterprise Application Platform vulnerabilities

Sources

Also known as DEBIAN-CVE-2020-1757, GHSA-2w73-fqqj-c92p, UBUNTU-CVE-2020-1757.