eclipse jetty CVE-2020-27216 vulnerability in Eclipse and Other Products
Published on October 23, 2020

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In Eclipse Jetty versions 1.0 thru 9.4.32.v20200930, 10.0.0.alpha1 thru 10.0.0.beta2, and 11.0.0.alpha1 thru 11.0.0.beta2O, on Unix like systems, the system's temporary directory is shared between all users on that system. A collocated user can observe the process of creating a temporary sub directory in the shared temporary directory and race to complete the creation of the temporary subdirectory. If the attacker wins the race then they will have read and write permission to the subdirectory used to unpack web applications, including their WEB-INF/lib jar files and JSP files. If any code is ever executed out of this temporary directory, this can lead to a local privilege escalation vulnerability.

Github Repository Vendor Advisory NVD

Weakness Types

Creation of Temporary File With Insecure Permissions

Opening temporary files without appropriate measures or controls can leave the file, its contents and any function that it impacts vulnerable to attack.

Creation of Temporary File in Directory with Insecure Permissions

The software creates a temporary file in a directory whose permissions allow unintended actors to determine the file's existence or otherwise access that file. On some operating systems, the fact that the temporary file exists may be apparent to any user with sufficient privileges to access that directory. Since the file is visible, the application that is using the temporary file could be known. If one has access to list the processes on the system, the attacker has gained information about what the user is doing at that time. By correlating this with the applications the user is running, an attacker could potentially discover what a user's actions are. From this, higher levels of security could be breached.


Products Associated with CVE-2020-27216

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Affected Versions

The Eclipse Foundation Eclipse Jetty:

Vulnerable Packages

The following package name and versions may be associated with CVE-2020-27216

Package Manager Vulnerable Package Versions Fixed In
maven org.mortbay.jetty:jetty-webapp < 9.4.33 9.4.33
maven org.eclipse.jetty:jetty-webapp < 9.4.33 9.4.33

Exploit Probability

EPSS
0.09%
Percentile
25.64%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.