Local Information Disclosure Vulnerability in io.netty:netty-codec-http
Description[GHSA-5mcr-gq6c-3hq2](https://github.com/netty/netty/security/advisories/GHSA-5mcr-gq6c-3hq2) (CVE-2021-21290) contains an insufficient fix for the vulnerability identified.ImpactWhen 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.This only impacts applications running on Java version 6 and lower. Additionally, this vulnerability impacts code running on Unix-like systems, and very old versions of Mac OSX and Windows as they all share the system temporary directory between all users.Vulnerability DetailsTo fix the vulnerability the code was changed to the following:Unfortunately, this logic path was left vulnerable:This file is still readable by all local users.PatchesUpdate to 4.1.77.FinalWorkaroundsSpecify your own `java.io.tmpdir` when you start the JVM or use `DefaultHttpDataFactory.setBaseDir(...)` to set the directory to something that is only readable by the current user or update to Java 7 or above.References[CWE-378: Creation of Temporary File With Insecure Permissions](https://cwe.mitre.org/data/definitions/378.html)[CWE-379: Creation of Temporary File in Directory with Insecure Permissions](https://cwe.mitre.org/data/definitions/379.html)For more informationIf you have any questions or comments about this advisory:Open an issue in [netty](https://github.com/netty/netty)