CVE-2021-21290

Creation of Temporary File With Insecure Permissions in maven/io.netty/netty-handler

Identifier

CVE-2021-21290

Package Slug

maven/io.netty/netty-handler

Vulnerability

Creation of Temporary File With Insecure Permissions

Description

Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers. There is a vulnerability on Unix-like systems involving an insecure temp file. When netty's multipart decoders are used local information disclosure can occur via the local system temporary directory if temporary storing uploads on the disk is enabled. On unix-like systems, the temporary directory is shared between all user. As such, writing to this directory using APIs that do not explicitly set the file/directory permissions can lead to information disclosure. Of note, this does not impact modern MacOS Operating Systems. The method File.createTempFile on unix-like systems creates a random file, but, by default will create this file with the permissions -rw-r--r--. Thus, if sensitive information is written to this file, other local users can read this information.

Affected Versions

All versions before 4.1.59

Solution

Upgrade to version 4.1.59 or above.

Last Modified

2021-02-19

source