Eclipse Jersey 2.28 - 2.33 and Eclipse Jersey 3.0.0 - 3.0.1 contains a local information disclosure vulnerability. This is due to the use of the File.createTempFile which creates a file inside of the system temporary directory with the permissions: -rw-r--r--. Thus the contents of this file are viewable by all other users locally on the system. As such, if the contents written is security sensitive, it can be disclosed to other local users.
Jersey 2.34 and 3.0.2 forward sets the correct permissions on the temporary file created by Jersey.
Hello Jersey Security Team,
Utilizing a custom CodeQL query written as a part of the GitHub Security Lab Bug Bounty program, I've unearthed a local temporary file information disclosure vulnerability.
You can see the custom CodeQL query utilized here:
https://lgtm.com/query/8831016213790320486/
This particular vulnerability exists because on unix-like systems (not including modern versions of MacOS) the system temporary directory is shared between all users. As such, failure to correctly set file permissions and/or verify exclusive creation of directories can lead to either local information disclosure, or local file hijacking by another user.
This vulnerability impacts the following locations in this project's source:
This vulnerability exists because of the vulnerability in the Utils.createTempFile:
https://github.com/eclipse-ee4j/jersey/blob/01c6a32a2064aeff2caa8133472e33affeb8a29a/core-common/src/main/java/org/glassfish/jersey/message/internal/Utils.java#L42-L53
This is because File.createTempFile creates a file inside of the system temporary directory with the permissions: -rw-r--r--. Thus the contents of this file are viewable by all other users locally on the system.
If there is sensitive information written to these files, it is disclosed to other local users on this system.
The fix for this vulnerability is to use the Files API (instead of the File API) to create temporary files/directories as this new API correctly sets the posix file permissions.
JLLeitschuh Analyst
Impact
Eclipse Jersey 2.28 - 2.33 and Eclipse Jersey 3.0.0 - 3.0.1 contains a local information disclosure vulnerability. This is due to the use of the
File.createTempFilewhich creates a file inside of the system temporary directory with the permissions:-rw-r--r--. Thus the contents of this file are viewable by all other users locally on the system. As such, if the contents written is security sensitive, it can be disclosed to other local users.Workaround
This issue can be mitigated by manually setting the
java.io.tmpdirsystem property when launching the JVM.Patches
Jersey 2.34 and 3.0.2 forward sets the correct permissions on the temporary file created by Jersey.
References
Similar Vulnerabilities
Similar, but not the same:
Original Disclosure:
References