CVE-2022-24823
Local Information Disclosure Vulnerability in io.netty:netty-codec-http
In short
Netty's file upload handling can leak sensitive information through the system temporary directory on older Java versions and Unix-like systems where multiple users share the same temp folder. An attacker with local access could read uploaded files intended for other users.
Technical detail
CVE-2021-21290's incomplete fix leaves multipart decoder temporary files readable by other local users on systems with shared /tmp directories (Unix-like systems, Java 6 and lower). The vulnerability requires disk-based temporary storage enabled and local filesystem access; impact is confidentiality of uploaded data. Remediation: upgrade to 4.1.77.Final, set custom java.io.tmpdir, or configure DefaultHttpDataFactory.setBaseDir() with restricted permissions.
Summary generated and translated by AI from the official description.
Netty is an open-source, asynchronous event-driven network application framework. The package `io.netty:netty-codec-http` prior to version 4.1.77.Final contains an insufficient fix for CVE-2021-21290. 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. 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. Version 4.1.77.Final contains a patch for this vulnerability. As a workaround, specify one's own `java.io.tmpdir` when starting the JVM or use DefaultHttpDataFactory.setBaseDir(...) to set the directory to something that is only readable by the current user.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N